1,2-Dichloroethane → (S)-3-((R)-4-Benzyl-2-oxooxazolidine-3-carbonyl)-N-(4-chlorobenzyl)hex-5-enamide

A solution of compound 3a (0.402 g, 1.3 mmol), EDC (0.364 g, 1.9 mmol), HOBT (0.256 g, 1.9 mmol), and Hunig's base (0.662 mL, 3.8 mmol) in dichloromethane (17 mL) was cooled to 0° C. and stirred for half an hour. To this solution 4-chlorobenzylamine (0.174 mL, 1.43 mmol) and a catalytic amount of DMAP were added. The reaction was stirred overnight and the reaction progress was monitored by TLC. The dichloromethane was removed in vacuo and the reaction mixture quenched with aqueous NH4Cl. The solution was washed with water and brine, dried over Na2SO4, and concentrated under reduced pressure to give well formed white crystals of 4a (0.443 g, 79%). 1H NMR (500 MHz, CDCl3): δ ppm 7.31-7.36 (m, 2H) 7.21-7.29 (m, 5H) 7.17-7.21 (m, 2H) 6.09 (t, J=5.6 Hz, 1H) 5.73-5.82 (m, 1H) 5.04-5.10 (m, 2H) 4.65 (ddd, J=13.3, 6.7, 3.4 Hz 1H) 4.41 (dd, J=15.2, 5.9 Hz, 1H) 4.34 (dd, J=14.9, 5.9 Hz, 1H) 4.23-4.30 (m, 1H) 4.23-4.30 (m, 1H) 4.14-4.18 (m, 2H) 3.28 (dd, J=13.7, 2.9 Hz, 1H) 2.66-2.80 (m, 2H) 2.41-2.51 (m, 2H) 2.22-2.29 (m, 1H); 13C NMR (126 MHz, CDCl3): δ 175.1, 171.0, 153.4, 137.1, 135.7, 134.8, 133.4, 129.7, 129.3, 129.1, 129.0, 127.5, 118.1, 66.3, 55.7, 43.1, 40.1, 38.0, 37.8, 36.3. HRMS calcd. for C24H25ClN2O4 (M+H) m/z 441.1581, found 441.1581.

1. stirringThe reaction was stirred overnight
2. customThe dichloromethane was removed in vacuo
3. customthe reaction mixture quenched with aqueous NH4Cl
4. washThe solution was washed with water and brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated under reduced pressure

ORD 기록

ord-ee9d6e8dca0c49aa84a82ff32de7bcab

출처 데이터셋

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US08530456B2