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CAS No. : | 2144-40-3 | MDL No. : | MFCD07369849 |
Formula : | C6H12O3 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | YCZZQSFWHFBKMU-OLQVQODUSA-N |
M.W : | 132.16 | Pubchem ID : | 12886254 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With diethyl ether; nickel at 160℃; Hydrogenation; | ||
With methanol; nickel at 160℃; Hydrogenation; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
80% | With lithium aluminium tetrahydride In diethyl ether for 12h; Heating; | |
With tetrahydrofuran; lithium aluminium tetrahydride |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogen bromide |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
55% | With dmap; triethylamine In tetrahydrofuran at 0 - 20℃; | 7.1 Step 1. Step 1. (cis-tetrahydrofuran-2,5-diyl)bis(methylene) bis(4-methylbenzenesulfonate) (7-2a) To a stirred solution of cis-2,5-bishydroxymethyl-tetrahydrofuran (7-1a, 263 mg, 1.99 mmol) and DMAP (24 mg, 0.20 mmol) in THF (7 mL) was added Et3N (1.3 mL, 9.3 mmol) and the resulting mixture was cooled to 0° C. Tosyl chloride (835 mg, 4.38 mmol) was added and the resulting mixture was allowed to warm to room temperature and then stirred overnight. The reaction mixture was then diluted with water (25 mL) and EtOAc (150 mL) was added. The organic layer was then washed with water (25 mL), sat. aq. NaHCO3 (30 mL), and brine (30 mL), dried over MgSO4, filtered, and concentrated to dryness. The crude material was purified by silica gel chromatography eluting with 0% to 60% EtOAc in heptane to afford the 7-2a as a white solid (488.6 mg, 1.098 mmol, 55% yield). MS [M+H2O]+=458.4. 1H NMR (400 MHz, DCM-d2) δ 7.87-7.73 (m, 4H), 7.48-7.37 (m, 4H), 4.10 (dddd, J=11.1, 6.4, 4.3, 1.9 Hz, 2H), 4.02-3.85 (m, 4H), 2.49 (s, 6H), 2.07-1.91 (m, 2H), 1.76-1.61 (m, 2H). |
With pyridine | ||
1.23 g | With pyridine at 0℃; |
With pyridine at 0 - 20℃; for 18h; | To a mechanically stirred suspension of silica-supported NaIO4 (240 g) in THF (1260 mL) and CH2Cl2 (138 mL) at 0° C. was added 1,5-hexadiene (8.5 mL) followed by addition in drops of a 0.01 M aqueous solution of RuCl3 (14.4 mL). After 1.5 h, iPrOH (300 mL) was added. Stir 10 min, then filter, wash silica with EtOAc and concentrate filtrate. Pass oil through silica gel eluting with Et2O, EtOAc and 5% MeOH/CHCl3. Yields a clear oil (9.5 g). This material was dissolved in pyridine (90 mL) at 0° C. A solution of TsCl (31 g) in pyridine (36 mL) was added in drops. Allow to warm to RT. After 18 h H2O (300 mL) was added. The white solid was collected by filtration and dried (12 g). This material in toluene (60 mL) was treated with benzylamine (10 mL). Heat at reflux for 18 h. Filter and concentrate in vacuo. Purify by vacuum distillation (5.7 g). This compound (7.3 g) in 1,2-dichloroethane (150 mL) was treated with 1-chloroethyl chloroformate (12 mL) and K2CO3 (15 g) and heated at reflux overnight. Filter using CH2Cl2. Concentrate, take up in EtOH and add 12 N HCl (5 mL). Concentrate. Add acetone and filter (4.5 g). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; thionyl chloride |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With tetrahydrofuran; lithium aluminium tetrahydride |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogen In water at 140℃; different temperatures, pressures, reaction times and concentrations of catalyst, other catalysts; | ||
1: 71 %Spectr. 2: 28 %Spectr. | With bis(acetato){2,2'-bis(diphenylphosphino)-1,1'-binaphthyl}ruthenium(II); hydrogen In toluene at 120℃; for 16h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
80 % Chromat. | With hydrogen In water at 140℃; for 0.5h; | |
64.912 % de | With [bis(2-methylallyl)cycloocta-1,5-diene]ruthenium(II); hydrogen; [(4S)-4-[5-bis(3,5-di-tert-butyl-4-methoxyphenyl)phosphanyl-1,3-benzodioxol-4-yl]-4,5,6,7-tetrahydro-1,3-benzodioxol-5-yl]-bis(3,5-di-tert-butyl-4-methoxyphenyl)phosphane In toluene at 120℃; for 16h; Overall yield = 87 %Spectr.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
87% | With Raney Ni (W-5); hydrogen In ethanol at 100℃; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
23% | With pyridine at 60℃; for 15h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
69% | With dmap; dicyclohexyl-carbodiimide In dichloromethane for 48h; Heating; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine In diethyl ether |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine In diethyl ether |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
82% | With pyridine for 24h; Ambient temperature; | |
12% | With dmap In dichloromethane at 25℃; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
27.3% | With sodium hydride In tetrahydrofuran for 48h; Heating; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydride In tetrahydrofuran for 42h; Heating; Yield given; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
33% | With sodium hydride In tetrahydrofuran for 42h; Heating; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
19% | With sodium hydride In tetrahydrofuran for 10h; Heating; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydride In tetrahydrofuran for 10h; Heating; Yield given; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine In diethyl ether |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine In diethyl ether |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In dichloromethane Ambient temperature; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
24.4% | With sodium hydride In tetrahydrofuran for 48h; Heating; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With lipase YS from Pseudomonas sp In cyclohexane for 1.5h; Ambient temperature; other 2,5-disubstituted tetrahydrofuran derivatives and acylating agents; asymmetric esterification; | ||
In cyclohexane for 1.5h; Ambient temperature; lipase YS from Pseudomonas sp.; Yield given. Yields of byproduct given. Title compound not separated from byproducts; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
69% | In acetonitrile at 100℃; for 20h; analogous reaction with and without other phase-transfer catalysts; analogous reaction of other diols; | |
69% | In acetonitrile at 100℃; for 20h; analogous reaction with other alcohols; analogous reation without and with other phase-transfer catalysts; | |
69% | In acetonitrile at 100℃; for 20h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1: 8% 2: 20% | With potassium permanganate; carbon dioxide In water; acetone at -10℃; pH 6; | |
1: 20% 2: 20% | With potassium permanganate; carbon dioxide In water; acetone at -10℃; pH 6; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1: 25% 2: 33% | With pyridine; acetic anhydride for 24h; Ambient temperature; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
76% | With lithium aluminium tetrahydride In tetrahydrofuran Heating; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
43% | With potassium carbonate In dimethyl sulfoxide for 240h; Ambient temperature; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
44% | With sodium hydroxide; tetra(n-butyl)ammonium hydrogensulfate In dichloromethane for 4h; Ambient temperature; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
at 160℃; Hydrogenation; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
93% | With sodium periodate In tetrahydrofuran; dichloromethane at 0℃; | |
60% | With osmium(VIII) oxide; trimethylamine-N-oxide; camphor-10-sulfonic acid In dichloromethane | |
5% | With tetrapropylammonium perruthennate; acetic acid; 4-methylmorpholine N-oxide In dichloromethane at 20℃; |
With silica-supported sodium periodate In tetrahydrofuran; dichloromethane; water at 0℃; for 1.5h; | To a mechanically stirred suspension of silica-supported NaIO4 (240 g) in THF (1260 mL) and CH2Cl2 (138 mL) at 0° C. was added 1,5-hexadiene (8.5 mL) followed by addition in drops of a 0.01 M aqueous solution of RuCl3 (14.4 mL). After 1.5 h, iPrOH (300 mL) was added. Stir 10 min, then filter, wash silica with EtOAc and concentrate filtrate. Pass oil through silica gel eluting with Et2O, EtOAc and 5% MeOH/CHCl3. Yields a clear oil (9.5 g). This material was dissolved in pyridine (90 mL) at 0° C. A solution of TsCl (31 g) in pyridine (36 mL) was added in drops. Allow to warm to RT. After 18 h H2O (300 mL) was added. The white solid was collected by filtration and dried (12 g). This material in toluene (60 mL) was treated with benzylamine (10 mL). Heat at reflux for 18 h. Filter and concentrate in vacuo. Purify by vacuum distillation (5.7 g). This compound (7.3 g) in 1,2-dichloroethane (150 mL) was treated with 1-chloroethyl chloroformate (12 mL) and K2CO3 (15 g) and heated at reflux overnight. Filter using CH2Cl2. Concentrate, take up in EtOH and add 12 N HCl (5 mL). Concentrate. Add acetone and filter (4.5 g). | |
With ruthenium tetroxide | ||
Multi-step reaction with 2 steps 1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 16 h / 20 °C 2: sodium hydroxide / water / 16 h / 20 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With ruthenium trichloride In tetrahydrofuran; dichloromethane; water at 0℃; Title compound not separated from byproducts.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 5 steps 1: 44 percent / n-Bu4NHSO4, aq. NaOH / CH2Cl2 / 4 h / Ambient temperature 2: 85 percent / Et3N / CH2Cl2 / 0 °C 3: 79 percent / NaI / butan-2-one / Heating 5: LiAlH4 / diethyl ether / 2 h / Heating |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 7 steps 1: 44 percent / n-Bu4NHSO4, aq. NaOH / CH2Cl2 / 4 h / Ambient temperature 2: 85 percent / Et3N / CH2Cl2 / 0 °C 3: 79 percent / NaI / butan-2-one / Heating 5: LiAlH4 / diethyl ether / 2 h / Heating 6: Et3N / diethyl ether / 20 h / Ambient temperature 7: 70 percent / methanol / 5 h / 100 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 6 steps 1: 44 percent / n-Bu4NHSO4, aq. NaOH / CH2Cl2 / 4 h / Ambient temperature 2: 85 percent / Et3N / CH2Cl2 / 0 °C 3: 79 percent / NaI / butan-2-one / Heating 5: LiAlH4 / diethyl ether / 2 h / Heating 6: Et3N / diethyl ether / 20 h / Ambient temperature |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: 44 percent / n-Bu4NHSO4, aq. NaOH / CH2Cl2 / 4 h / Ambient temperature 2: 85 percent / Et3N / CH2Cl2 / 0 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 4 steps 1: 44 percent / n-Bu4NHSO4, aq. NaOH / CH2Cl2 / 4 h / Ambient temperature 2: 85 percent / Et3N / CH2Cl2 / 0 °C 3: 79 percent / NaI / butan-2-one / Heating |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: 44 percent / n-Bu4NHSO4, aq. NaOH / CH2Cl2 / 4 h / Ambient temperature 2: 85 percent / Et3N / CH2Cl2 / 0 °C 3: 79 percent / NaI / butan-2-one / Heating |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: 82 percent / pyridine / 24 h / Ambient temperature 2: 33 percent / acetic anhydride, pyridine / 24 h / Ambient temperature |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: 2.) H2 / 2.) Pd/C / 2.) MeOH, 1 h 2: 83 percent / HCl gas / dioxane; H2O / 12 h / 60 °C 3: 76 percent / LiAlH4 / tetrahydrofuran / Heating |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: 83 percent / HCl gas / dioxane; H2O / 12 h / 60 °C 2: 76 percent / LiAlH4 / tetrahydrofuran / Heating |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 5 steps 1: pyridine / diethyl ether 2: phosphate buffer / pig liver esterase / H2O / 18 h / 0 °C 3: 1.) CrO3 / 1.) acetone 4: sodium carbonate / H2O / Ambient temperature 5: diethyl ether |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: pyridine / diethyl ether 2: phosphate buffer / pig liver esterase / H2O / 18 h / 0 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: pyridine / diethyl ether 2: phosphate buffer / pig liver esterase / H2O / 2.8 h / 0 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: pyridine / diethyl ether 2: phosphate buffer / pig liver esterase / H2O / 18 h / 0 °C 3: 1.) CrO3 / 1.) acetone |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: pyridine / diethyl ether 2: phosphate buffer / pig liver esterase / H2O / 2.8 h / 0 °C 3: 1.) CrO3 / 1.) acetone |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 4 steps 1: pyridine / diethyl ether 2: phosphate buffer / pig liver esterase / H2O / 18 h / 0 °C 3: 1.) CrO3 / 1.) acetone 4: sodium carbonate / H2O / Ambient temperature |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: 23 percent / pyridine / 15 h / 60 °C 2: Et3N / CH2Cl2 / 0.5 h / Ambient temperature 3: LiN3 / dimethylformamide / 15 h / 70 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: 23 percent / pyridine / 15 h / 60 °C 2: Et3N / CH2Cl2 / 0.5 h / Ambient temperature |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 5 steps 1: 23 percent / pyridine / 15 h / 60 °C 2: Et3N / CH2Cl2 / 0.5 h / Ambient temperature 3: LiN3 / dimethylformamide / 15 h / 70 °C 4: 1.) PPh3, 2.) H2O / 1.) THF, RT, 63 h, 2.) THF, reflux, 1 h 5: 69 percent / Et3N / CH2Cl2 / Ambient temperature |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 6 steps 1: 23 percent / pyridine / 15 h / 60 °C 2: Et3N / CH2Cl2 / 0.5 h / Ambient temperature 3: LiN3 / dimethylformamide / 15 h / 70 °C 4: 1.) PPh3, 2.) H2O / 1.) THF, RT, 63 h, 2.) THF, reflux, 1 h 5: 69 percent / Et3N / CH2Cl2 / Ambient temperature 6: 94 percent / NaI / butan-2-one / 3 h / Heating |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 4 steps 1: 23 percent / pyridine / 15 h / 60 °C 2: Et3N / CH2Cl2 / 0.5 h / Ambient temperature 3: LiN3 / dimethylformamide / 15 h / 70 °C 4: 1.) PPh3, 2.) H2O / 1.) THF, RT, 63 h, 2.) THF, reflux, 1 h |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: 91 percent / diethyl ether 2: 80 percent / LiAlH4 / diethyl ether / 12 h / Heating |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 5 steps 1: CH2Cl2 / Ambient temperature 2: 75 percent / 4.75 h / Ambient temperature; lipase from Mucor javanicus (LMJ), 0.1 M pH 7 buffer; other enzymes 3: PCC, Mol.sieves / CH2Cl2 / Ambient temperature 4: Br2 / H2O / Ambient temperature 5: K2CO3 / methanol / Ambient temperature |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: CH2Cl2 / Ambient temperature 2: 75 percent / 4.75 h / Ambient temperature; lipase from Mucor javanicus (LMJ), 0.1 M pH 7 buffer; other enzymes 3: PCC, Mol.sieves / CH2Cl2 / Ambient temperature |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: CH2Cl2 / Ambient temperature 2: 75 percent / 4.75 h / Ambient temperature; lipase from Mucor javanicus (LMJ), 0.1 M pH 7 buffer; other enzymes |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 4 steps 1: CH2Cl2 / Ambient temperature 2: 75 percent / 4.75 h / Ambient temperature; lipase from Mucor javanicus (LMJ), 0.1 M pH 7 buffer; other enzymes 3: PCC, Mol.sieves / CH2Cl2 / Ambient temperature 4: Br2 / H2O / Ambient temperature |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: pyridine 2: methanol. NH3 / 160 °C / Erhitzen des Reaktionsprodukts mit wss. Ba(OH)2 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: pyridine; thionyl chloride 2: 165 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: pyridine 2: THF / 135 - 140 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: pyridine 2: THF / 135 - 140 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: pyridine 2: methanol. NH3 / 160 °C / Erhitzen des Reaktionsprodukts mit wss. Ba(OH)2 3: aqueous KNO2; acetic acid |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: pyridine 2: methanol. NH3 / 160 °C / Erhitzen des Reaktionsprodukts mit wss. Ba(OH)2 3: sodium acetate |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: pyridine 2: aq. NaOH solution |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: pyridine; thionyl chloride 2: 165 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1: pyridine; thionyl chloride 2: 165 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1: water / 210 °C / Erhitzen des Reaktionsprodukts mit Aethanol, Toluol und wenig Schwefelsaeure 2: lithium alanate; tetrahydrofuran |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
730 mg (25%) | With NaH; sodium chloride In tetrahydrofuran; dichloromethane; chloroform; mineral oil | Preparation of Compound 16 Preparation of Compound 16 To a refluxing suspension of 3.0 g (62.5 mmol) of NaH (50% in mineral oil) in 400 mL of THF under Ar was added to a solution of 3.0 g (4.5 mmol) of 15 and 610 mg (4.6 mmol) of cis-2,5-bishydroxymethyltetrahydrofuran in 800 mL of THF over 8 h. The mixture was refluxed for an additional 16 h, cooled to 25° C., excess NaH decomposed with CH3 OH, and the solvent was evaporated at 30°/30 mm. The residue was dissolved in 500 mL portions of CHCl3 and 10% NaCl, acidified to pH~3, and the organic layer was separated, dried, concentrated to 15 mL, and added to a silica gel column (150 g) made up in CH2 Cl2. Elution of the column with CH2 Cl2 (1 L) and 19:1 and 9:1 CH2 - acetone (2 L of each) gave traces of unidentified material. Further elution of the column with 4:1 and 7:3 CH2 Cl2 -acetone mixtures (2 L of each) gave 730 mg (25%) of 16 as a white foam. The mass spectrum (70 eV) gave the expected molecular ion at m/e 638. The 1 H NMR spectrum (200 MHz, CDCl3) gave absorptions at δ 0.76 (t, inner OCH2 CH3, 3H), 0.98-1.18 (m, outer OCH2 CH3, 6H), 1.53- 2.41 (m, ArCH3, CH2 CH2, 10H), 3.38-4.65 (m, OCH2, CH2 CHO, 16H) and 7.03-7.42 (m, ArH, 10H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In acetonitrile | 1 Cis-2-[(octadecylaminocarbonyl)oxy]methyl-5-hydroxymethyl tetrahydrofuran STR11 EXAMPLE 1 Cis-2-[(octadecylaminocarbonyl)oxy]methyl-5-hydroxymethyl tetrahydrofuran STR11 A suspension of 2.64 g (20 mmol) of cis-2,5-bis(hydroxymethyl)tetrahydrofuran, 7.99 g (24 mmol) of octadecyl bromide, 2.43 g (30 mmol) of potassium cyanate and 0.966 g (3 mmol) of tetrabutyl ammonium bromide in 100 ml of dry acetonitrile was refluxed, with stirring, at 100° C. for 20 hours. The resultant mixture was then diluted with hot methylene chloride, filtered and the filtrate concentrated in vacuo. The crude product was then purified by flash silica gel chromatography employing successive mixtures of petroleum ether and ethyl acetate in ratios of 4:1, 2.33:1 and 1:1 as the eluent to yield the title compound as a solid, m.p. 79°-80° C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
39 % ee | With C42H60N6O7; N-ethyl-N,N-diisopropylamine In toluene at 0℃; for 5h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
62% | With dmap In dichloromethane at 25℃; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1: 42% 2: 14% | In N,N-dimethyl-formamide at 100℃; for 48h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
93% | With (carbonyl)(chloro)(hydrido)tris(triphenylphosphine)ruthenium(II); ammonia; 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene In tert-Amyl alcohol at 150℃; for 40h; Inert atmosphere; Autoclave; | 2 Example 2: Homogeneously catalytic process using Ru-based Catalyst (HI) In a nitrogen-purged sealed autoclave (25 ml), 2,5- bis(hydroxymethyl)tetrahydrofuran (264 mg, 2.0 mmol), Xantphos (3 mol%) and [Ru(CO)CIH(PPh3)3] (3mol%) were dissolved in 2 ml of tert-amyl alcohol and then charged with 5 bar NH3. The mixture was heated at 1500C for 40 hours. The thus obtained product was then analysed by NMR and CC using biphenyl as internal standard. The bicyclic product (I, R = H) was obtained in 93% yield. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
94% | With C5H14IrN3(2+)*2I(1-) In water at 120℃; for 20h; Inert atmosphere; Sealed tube; | 1 Example 1: Homogeneously catalytic process using Ir-based Catalyst (HI) In a nitrogen-purged sealed caroulsel tube, 2,5- bis(hydroxymethyl)tetrahydrofuran (132 mg, 1.Ommol) and benzylamine(268 mg, 2.5 mmol.) in 0.5 ml of water containing 3.0 mol% of [Cp*lr(NH3)3][l]2 catalyst were heated at 120°C for 20 hours. The reaction mixture was then cooled and extracted with ethyl acetate (2m1 x 3 times). The thus obtained product was then analysed by NMR and CC using biphenyl as the internal standard. The bicyclic product (I, R = benzyl) was obtained in 94% yield. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydroxide In water at 20℃; for 16h; Overall yield = 70 %; | (±)-((2S,5S)-tetrahydrofuran-2,5-diyl) dimethanol 6a,((2R,5R)-tetrahydrofuran-2,5-diyl) dimethanol 6b: and((2R,5S)-tetrahydrofuran-2,5-diyl) dimethanol 6c from 1,5-hexadiene 17 through the 1,5-diepoxide 18: 3-Chloroperoxybenzoicacid (57-60%, 48.6 g, 281 mmol) was addedin five portions to a mechanically-stirred solution of 1,5-hexadiene 17 (4.84 g, 59 mmol) in CH2Cl2 (150 mL) whilecooling (0°C). The reaction mixture was allowed to warm toroom temperature then stirring was continued (16h). Saturatedaqueous sodium bicarbonate (100 mL) was then addedto the reaction mixture while stirring followed by separationof the organic layer and washing with 1M aqueous KOH (7 x50 mL). The organic layer was then dried over anhydrousMgSO4, filtered and concentrated to provide the racemic/meso 1, 5-diepoxides 18 (6.8 g, >99%). A mixture ofaqueous NaOH (18 mL, 0.1M) and the diepoxide 18 (1.0 g,8.7 mmol) was stirred at room temperature (16 h). Water wasthen removed and the oily residue was flushed through asilica gel column giving the mixture of oily (2S,5S)-6a,(2R,5R)-6b and (2S,5R)-6c diols (0.8 g, 70%). The mixturewas then submitted to gravity-column chromatography(CHCl3/tert-butanol, 7/3) which separated the more mobile(2S,5R)-6c from the racemic mixture of 6a/6b. Acetylation(Ac2O/pyridine) of a portion of the 6a/6b/6c mixture followedby flash chromatography gave a mixture of the threecorresponding stereoisomeric diacetates. The diacetates weresubmitted to chiral HPLC (ChiracelOJ, 4.6 x 250 mm, 10;mobile phase 80% hexane/20% ethanol; 0.7 mL/min, 22°C)and indicated that the ratio of racemic: meso diacetates was54:46. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85% | With hydrogen In ethanol at 120℃; for 3h; Autoclave; | 6 EXAMPLE 6: HMF reduction to FDM EXAMPLE 6: HMF reduction to FDMCopper zinc nanopowder and some commercial catalysts were also tested the hydrogenation of HMF at mild temperature for the achievement of useful diol building blocks (suppliers are indicated in table 6). Table 7. Composition details (and suppliers) of the commercial catalysts used.The vessel was pressurized with 70 bar H2 and subsequently heated to 120 C for 3 hours. In the adopted experimental conditions, all commercial catalysts showed good to excellent activity in the hydrogenation of HMF to FDM (2,5-furandimethanol) and THFDM (2,5-tetrahydrofurandimethanol), which account together for a combined selectivity of >80% (see Scheme 3).Scheme 3. Commercial compositions, such as catalyst D and catalyst G, both based on copper and nickel supported on S1O2 and Si02 Zr02, respectively, showed good selectivity to FDM (Table 8, entry 1 and 2) but no complete conversion of HMF, especially with catalyst G, which is characterized by a lower content of Cu and Ni than catalyst D. Ni Raney alloy showed complete conversion of HMF and high selectivity to THFDM (94%, table 8, entry 3), while Ni supported on ceria and zirconia (table 8, entry 4) led to an approximately equimolar mixture of FDM and THFDM. The strong interaction between nickel and the support might cause a reduced hydrogenation activity. Also the simultaneous presence of copper and nickel centres may attenuate the hydrogenation activity of nickel, which is very active in the reduction of C=C bonds (Table 8, entry 1 and 2 vs. entry 3).Interestingly, Cu-Zn alloy showed quantitative conversion of HMF and excellent selectivity to FDM (94%, table 8, entry 5), with no ring- hydrogenation. With the exception of Pt/C, which also selectively reduced HMF to FDM (table 8, entry 6), other hydrogenation catalysts based on noble metals preferably gave THFDM or a mixture of FDM and THFDM. Interestingly, Pd/A Oe and Pd/C showed high selectivity to THFDM by hydrogenation of both C=0 and C=C bonds (table 8, entry 7 and 8). |
1% | With palladium/alumina; hydrogen In ethanol at 120℃; for 3h; Autoclave; | 6 EXAMPLE 6: HMF reduction to FDM EXAMPLE 6: HMF reduction to FDMCopper zinc nanopowder and some commercial catalysts were also tested the hydrogenation of HMF at mild temperature for the achievement of useful diol building blocks (suppliers are indicated in table 6). Table 7. Composition details (and suppliers) of the commercial catalysts used.The vessel was pressurized with 70 bar H2 and subsequently heated to 120 C for 3 hours. In the adopted experimental conditions, all commercial catalysts showed good to excellent activity in the hydrogenation of HMF to FDM (2,5-furandimethanol) and THFDM (2,5-tetrahydrofurandimethanol), which account together for a combined selectivity of >80% (see Scheme 3).Scheme 3. Commercial compositions, such as catalyst D and catalyst G, both based on copper and nickel supported on S1O2 and Si02 Zr02, respectively, showed good selectivity to FDM (Table 8, entry 1 and 2) but no complete conversion of HMF, especially with catalyst G, which is characterized by a lower content of Cu and Ni than catalyst D. Ni Raney alloy showed complete conversion of HMF and high selectivity to THFDM (94%, table 8, entry 3), while Ni supported on ceria and zirconia (table 8, entry 4) led to an approximately equimolar mixture of FDM and THFDM. The strong interaction between nickel and the support might cause a reduced hydrogenation activity. Also the simultaneous presence of copper and nickel centres may attenuate the hydrogenation activity of nickel, which is very active in the reduction of C=C bonds (Table 8, entry 1 and 2 vs. entry 3).Interestingly, Cu-Zn alloy showed quantitative conversion of HMF and excellent selectivity to FDM (94%, table 8, entry 5), with no ring- hydrogenation. With the exception of Pt/C, which also selectively reduced HMF to FDM (table 8, entry 6), other hydrogenation catalysts based on noble metals preferably gave THFDM or a mixture of FDM and THFDM. Interestingly, Pd/A Oe and Pd/C showed high selectivity to THFDM by hydrogenation of both C=0 and C=C bonds (table 8, entry 7 and 8). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1: 42.5 %Chromat. 2: 15.4 %Chromat. 3: 17.1 %Chromat. 4: 20.1 %Chromat. 5: 3.4 %Chromat. | With hydrogen In tetrahydrofuran at 150℃; for 3h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
58% | Stage #1: cis-2,5-bis(hydroxymethyl)tetrahydrofuran With sodium hydride In tetrahydrofuran; mineral oil for 0.5h; Cooling; Stage #2: ((2R,5S)-5-(iodomethyl)tetrahydrofuran-2-yl)methanol In tetrahydrofuran; mineral oil | 5 Example 5. Preparation of ((2R,5S)-5-((((2R,5S)-5-(hydroxymethyl)tetrahydrofuran-2- Experimental: A flame-dried, 100 mL boiling flask was charged with 1 g of ((2R,5S)- tetrahydrofuran-2,5-diyl)dimethanol (A, 7.57 mmol)) and 25 mL of anhydrous THF. The flask was immersed in a saturated brine/ice bath (~ -10°C) and 302 mg of sodium hydride (60 wt.% in mineral oil, 7.57 mmol) added in 5 portions (-60 mg) over 15 min. After complete addition, the resultant suspension was stirred for 15 min, furnishing an intense green color. A septum was then placed over the neck of the flask, and 1.86 g of ((2R, 5S)-5-(iodomethyl)tetrahydrofuran-2-yl)methanol (B, 7.57 mmol) dissolved in 10 mL of THF was added dropwise via syringe over 15 min. After addition, the brine/ice bath was removed and reaction stirred overnight. After this time, solids were filtered and filtrate poured over a pre-fabricated silica gel column, where flash chromatography with a gradient hexanes- >hexanes/ethyl acetate furnished 1.08 g of the title compound as a colorless oil (58%). The structure was of the product was validated by NMR. NMR (400 MHz, CDC13) δ (ppm) 5.00 (broad s, 2H), 4.02 (m, 2H), 3.82 (m, 2H), 3.66-3.61 (m, 4H), 3.47-3.51 (m, 4H), 2.02 (m, 4H), 1.74 (m, 4H). 13C NMR (100 MHz, CDC13) δ (ppm) 88.8, 85.4, 77.2, 65.1, 30.8, 29.4. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With palladium on activated charcoal; water; hydrogen at 170℃; for 2h; Autoclave; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With palladium on activated charcoal; hydrogen at 170℃; for 2h; Autoclave; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 3 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 170 °C / Inert atmosphere | ||
Multi-step reaction with 3 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 190 °C / Inert atmosphere |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 5 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 170 °C / Inert atmosphere 4.1: potassium hydroxide; tetra(n-butyl)ammonium hydrogensulfate / toluene / 12 h / 10 - 25 °C 5.1: lithium hydroxide / methanol / 2 h / 10 - 25 °C 5.2: pH 4-5 | ||
Multi-step reaction with 5 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 190 °C / Inert atmosphere 4.1: potassium hydroxide; tetra(n-butyl)ammonium hydrogensulfate / toluene / 12 h / 10 - 25 °C 5.1: lithium hydroxide / methanol / 2 h / 10 - 25 °C 5.2: pH 4-5 | ||
Multi-step reaction with 5 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 170 °C / Inert atmosphere 4.1: potassium hydroxide; tetra(n-butyl)ammonium hydrogensulfate / N,N-dimethyl-formamide / 12 h / 10 - 25 °C 5.1: lithium hydroxide / methanol / 2 h / 10 - 25 °C 5.2: pH 4-5 |
Multi-step reaction with 5 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 190 °C / Inert atmosphere 4.1: potassium hydroxide; tetra(n-butyl)ammonium hydrogensulfate / N,N-dimethyl-formamide / 12 h / 10 - 25 °C 5.1: lithium hydroxide / methanol / 2 h / 10 - 25 °C 5.2: pH 4-5 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 4 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 170 °C / Inert atmosphere 4.1: potassium hydroxide; tetra(n-butyl)ammonium hydrogensulfate / toluene / 12 h / 10 - 25 °C | ||
Multi-step reaction with 4 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 190 °C / Inert atmosphere 4.1: potassium hydroxide; tetra(n-butyl)ammonium hydrogensulfate / toluene / 12 h / 10 - 25 °C | ||
Multi-step reaction with 4 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 170 °C / Inert atmosphere 4.1: potassium hydroxide; tetra(n-butyl)ammonium hydrogensulfate / N,N-dimethyl-formamide / 12 h / 10 - 25 °C |
Multi-step reaction with 4 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C 3.1: 1-methyl-pyrrolidin-2-one / 15 h / 190 °C / Inert atmosphere 4.1: potassium hydroxide; tetra(n-butyl)ammonium hydrogensulfate / N,N-dimethyl-formamide / 12 h / 10 - 25 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Multi-step reaction with 2 steps 1.1: sodium hydride / tetrahydrofuran / 0.5 h / 0 °C 1.2: 6.5 h / 0 - 25 °C 2.1: tetrahydrofuran / 110 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Stage #1: cis-2,5-bis(hydroxymethyl)tetrahydrofuran With sodium hydride In tetrahydrofuran at 0℃; for 0.5h; Stage #2: p-toluenesulfonyl chloride In tetrahydrofuran at 0 - 25℃; for 6.5h; | 3 Under the ice bath,Cis 2,5-dimethyloltetrahydrofuran(26.4g, 0.2mol) dissolved in 500mL tetrahydrofuranNaH (8.8 g, 0.22 mol) was added, stirred at 0 ° C for 30 min, then p-toluenesulfonyl chloride (41.8 g, 0.22 mol).After continuing to react at 0 ° C for 30 min, the temperature was naturally raised to room temperature, and the reaction was carried out for 6 h, and water (100 mL) and ethyl acetate (200 mL) were added for extraction.The organic phase is concentrated, concentrated under reduced pressure, and the crude product is purified by chromatography on silica gel column.The cis-(5-(hydroxymethyl)tetrahydrofuran-2-yl)p-toluenesulfonate methyl group was collected under reduced pressure.After directly adding 33 mL of isopropylamine, the tube was heated to 110 ° C to carry out a reaction, and the reaction was overnight.After cooling to room temperature, decompress isopropylamine at low temperature, then purified by chromatography on silica gel column, collected under reduced pressure, and dried in vacuo to give 27.8 g.Yellow oily cis-5-(isopropylaminomethyl)tetrahydrofuran-2-yl)methanol, yield: 80.2% |
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