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[ CAS No. 126587-36-8 ] {[proInfo.proName]}

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Chemical Structure| 126587-36-8
Chemical Structure| 126587-36-8
Structure of 126587-36-8 * Storage: {[proInfo.prStorage]}
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Product Details of [ 126587-36-8 ]

CAS No. :126587-36-8 MDL No. :MFCD26406818
Formula : C14H23NO5 Boiling Point : -
Linear Structure Formula :- InChI Key :-
M.W : 285.34 Pubchem ID :-
Synonyms :

Safety of [ 126587-36-8 ]

Signal Word:Warning Class:N/A
Precautionary Statements:P264-P270-P301+P312-P330 UN#:N/A
Hazard Statements:H302 Packing Group:N/A
GHS Pictogram:

Application In Synthesis of [ 126587-36-8 ]

* 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.

  • Downstream synthetic route of [ 126587-36-8 ]

[ 126587-36-8 ] Synthesis Path-Downstream   1~2

  • 1
  • [ 88738-78-7 ]
  • [ 95715-87-0 ]
  • [ 126587-36-8 ]
YieldReaction ConditionsOperation in experiment
85% With 18-crown-6 ether; sodium hydride at -78℃;
85% Stage #1: bis-(2,2,2-trifluoroethyl)(methoxycarbonylmethyl)phosphonate With potassium hexamethylsilazane; 18-crown-6 complexed with acetonitrile In tetrahydrofuran; toluene at -78℃; for 0.25h; Inert atmosphere; Stage #2: (R)-3-tert-butoxycarbonyl-4-formyl-2,2-dimethyloxazolidine In tetrahydrofuran; toluene at -78 - 0℃; Inert atmosphere;
82% Stage #1: bis-(2,2,2-trifluoroethyl)(methoxycarbonylmethyl)phosphonate With sodium hydride In tetrahydrofuran at 0℃; for 0.5h; Inert atmosphere; Stage #2: (R)-3-tert-butoxycarbonyl-4-formyl-2,2-dimethyloxazolidine With 18-crown-6 ether In tetrahydrofuran at -78℃; for 2h; Inert atmosphere; enantioselective reaction; 2 (S,Z)-tert-Butyl 4-(3-methoxy-3-oxoprop-1-enyl)-2,2-dimethyloxazolidine-3-carboxylate (S,Z)-2 General procedure: To an oily suspension of NaH 60% (2.1g, 52.5mmol) in THF (90mL), at 0°C, under nitrogen was added, dropwise, a solution of (CF3CH2O)2P(O)CH2CO2Me (10mL, 52.3mmol) in THF (60mL). The solution was stirred at 0°C for 30min and then cooled to -78°C. To this solution was added 18-Crown-6 (69g, 261mmol) in THF (150mL) and then (R)-Garner’s aldehyde 1 (9.2g, 40.2mmol) in THF (20mL). The reaction mixture was stirred at the same temperature for 2h and the reaction quenched with aqueous saturated NH4Cl solution. The reaction mixture was extracted with Et2O, dried over MgSO4, and concentrated under vacuum. The crude residue was purified by column chromatography (silica gel, hexanes/Et2O:(1/4)) to give product (S,Z)-2 as white solid. Yield (9.39g, 82%). TLC (hexane/Et2O:1/1): Rf=0.71. HPLC (CH3CN/H2O:50/50, 0.7mL/min): tR=9.5min. 1H NMR (250MHz, CDCl3) δ (ppm) 6.22 (m, 1H, CH=CH-COOMe), 5.78 (d, 3JH-H=11.4Hz, 1H, CH=CH-COOMe), 5.34 (s, 1H, CH-α), 4.23 (t, 3JH-H=7.8Hz, 1 H, CH2aO), 3.71 (dd, 3JH-H=9.2 and 4JH-H=3.1Hz, 1H, CH2bO), 3.65 (s, 3H, COOCH3), 1.57 (s, 3H, C-CH3), 1.50-1.22 (m, 12H, C-CH3 and [C(CH3)3] Boc). 13C NMR (63MHz, CDCl3) δ (ppm) 166.25 (COOMe), 152.26 (CO Boc), 151.86/151.24 (rotamers, CH=CH-COOMe), 119.67/119.08 (rotamers, CH=CH-COOMe), 94.42/93.89 (rotamers, C-(CH3)2), 80.54/79.92 (rotamers, ([C(CH3)3]Boc), 69.03/68.80 (rotamers, CH2O), 56.61/55.58 (rotamers, CH-α), 51.38 (COOCH3), 28.34 ([C(CH3)3] Boc), 27.32/26.62 (rotamers, C-CH3), 24.92/23.75 (rotamers, C-CH3). The enantiomeric excess of (S,Z)-2 was determined by HPLC (Chiral OD-H column, i-PrOH/hexane:5/95), tR=7.8min for (R) enantiomer and tR=8.5min for (S) enantiomer in the HPLC chromatogram. The ee for (S,Z)-2 was 94% and its [α]25D[α]D25 -27.3 (c=0.91, CHCl3). For (R,Z)-2 enantiomer the ee=96% and the measured [α]25D[α]D25 +28.5 (c=1.03, CHCl3). LRMS-(ESI+), m/z: 286.2 [M+H]+, 308.1 [M+Na]+.
81% With 18-crown-6 ether; sodium hydride In tetrahydrofuran
72% Stage #1: bis-(2,2,2-trifluoroethyl)(methoxycarbonylmethyl)phosphonate With 18-crown-6 ether; potassium hexamethylsilazane In tetrahydrofuran at -78℃; for 1h; Inert atmosphere; Stage #2: (R)-3-tert-butoxycarbonyl-4-formyl-2,2-dimethyloxazolidine In tetrahydrofuran at -78℃; for 3h;
With 18-crown-6 ether; potassium hydride; 1,1,1,3,3,3-hexamethyl-disilazane THF, -78 deg C; Yield given. Multistep reaction;
With 18-crown-6 ether; potassium hydride; 1,1,1,3,3,3-hexamethyl-disilazane 1.) THF, -78 deg C, 10 min, 2.) THF, -78 deg C, 30 min; Yield given. Multistep reaction;
With sodium hydride 1.)THF, 0 deg C, 30 min 2.) THF, -78 deg C, 2 h; Yield given. Multistep reaction;

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