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CAS No. : | 1010814-94-4 | MDL No. : | MFCD11111810 |
Formula : | C16H27NO5 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | ALIVCUSTZCGWKQ-UHFFFAOYSA-N |
M.W : | 313.39 | Pubchem ID : | 49759529 |
Synonyms : |
|
Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
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 |
---|---|---|
50.6% | To a solution of diisopropylamine (13.5 ml, 96 mmol) in THF (300 ml) at -78C was added dropwise n-BuLi (2.5M in Hex, 32 ml). The mixture was warmed to -100C and re-cooled to -78C. A solution of 4-oxo-piperidine-l-carboxylic acid tert-butyl ester (10 g, 50 mmol) in THF (50 ml) was then added dropwise and the mixture stirred at -78C for another 15 min. A solution of tert-butyl bromoacetate (12.6 ml, 85 mmol) in THF (30 ml) and HMPT (5 ml) was then added dropwise and the mixture stirred at -78C for 4 h and then gradually warmed to rt. The mixture was taken up in sat. aq. NH4Cl and extracted with EA. The yield after work up and chromatography (eluent Hex/EA 4:1) was 7.6 g (50.6%; yellowish oil).1H NMR (CDCl3) delta: 4.40-4.20 (m, 2H); 3.25-3.15 (m, IH); 3.00-2.80 (m, 2H); 2.70-2.40 (m, 3H); 2.30-2.10 (m, IH); 1.51 (s, 9H), 1.46 (s, 9H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | Methyltriphenylphosphonium bromide (8.5 g, 23.9 mmol) was suspended in THF (23 ml) and treated with KOtBu (2.7 g, 23.9 mmol). The resulting yellow suspension was stirred at rt for 1 h. A solution of the intermediate 7.i (3.0 g, 9.6 mmol) in THF was added dropwise and the mixture was stirred at rt for 2 h, taken up in water and diluted with ether. The yield after work up and chromatography (Hex:EA 9:1) was 1.8 g (60%; colourless oil). 1H NMR (CDCl3) delta: 4.80 (s, IH); 4.75 (s, IH); 4.60-4.20 (m, 4H); 2.80-2.60 (m, IH); 2.50-2.25 (m, 3H); 2.25-2.10 (m, IH); 1.48 (s, 9H); 1.46 (s, 9H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
To a solution of diisopropylamine (7.41 g, 73.2 mmol) in dry tetrahydrofuran (150 mL) was added n-BuLi (2.5 M, 16 mL) dropwise at -70 C under nitrogen. The resultant mixture was warmed to -10 C and stirred for 30 min. The mixture was cooled to -70 C, and a solution of tert-butyl 4-oxopiperidine-1-carboxylate (5.00 g, 25.1 mmol) in dry tetrahydrofuran (20.0 mL) was added dropwise and stirred for 30 min. Then, a solution of tert-butyl 2-bromoacetate (4.89 g, 25.1 mmol) in tetrahydrofuran (20.0 mL) was added dropwise, followed by hexamethylphosphoramide (HMPA) (1.80 g, 11.0 mmol). On completion, to the mixture was added water (10 mL), and the solution was extracted with ethyl acetate (3 x 50 mL). The combined ethyl acetate phase was dried over sodium sulfate and concentrated in vacuo. The residue was purified by column chromatography (petroleum ether:ethyl acetate = 0:1 to 100:1) to give the title compound. 1H NMR (300 MHz, CDCl3) delta = 4.22 - 4.03 (m, 1H), 3.65 (t, J = 6.0 Hz, 2H), 2.83 (s, 1H), 2.57 - 2.33 (m, 4H), 2.32 - 2.06 (m, 1H), 1.43 (s, 9H), 1.38 (s, 9H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With ammonium acetate; sodium cyanoborohydride; In tetrahydrofuran; at 20℃; for 16h;Molecular sieve; | To a mixture of (±)-tert-butyl 3-(2-tert-butoxy-2-oxo-ethyl)-4-oxo-piperidine-1- carboxylate (2.00 g, 6.38 mmol) in tetrahydrofuran (20.0 mL) was added ammonium acetate (1.48 g, 19.1 mmol), followed by 4A MS (500 mg), and sodium cyanotrihydroborate (1.20 g, 19.1 mmol) in one portion at 20 C. The mixture was stirred at 20 C for 16 hrs. On completion, to the mixture was added water (30 mL) and the solution was extracted with dichloromethane (3 x 30 mL). The combined dichloromethane phase was dried over sodium sulfate and concentrated in vacuo. The crude product was purified by column chromatography (petroleum ether:ethyl acetate = 10:1 to dichloromethane:methanol = 20:1) to give the title compound (crude).1H NMR (400 MHz, DMSO-d6) delta = 3.90 - 3.72 (m, 2H), 3.41 - 3.31 (m, 1H), 3.08 - 2.74 (m, 3H), 2.37 - 2.24 (m, 1H), 1.87 - 1.84 (m, 1H), 1.63 - 1.39 (m, 19H). |
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