反应详情

A solution of N-benzyloxycarbonyl-L-isoleucine (10.0 g, 37.7 mmol) in DCM 150 mL) was treated with N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (7.94 g, 41.5 mmol), cyclopentanol (3.90 g, 45.2 mmol) and N,N-dimethylaminopyridine reaction mixture was washed with 1M hydrochloric acid, saturated sodium bicarbonate, and brine before drying over magnesium sulphate, filtration and removal of solvent under reduced pressure to leave N-benzyloxycarbonyl-L-isoleucine cyclopentyl ester as a colourless oil (10.99 g, 87%). 1H-NMR; δ (CDCl3) 7.44-7.30 (5H, m), 5.37-5.34 (1H, m), 5.22-5.18 (1H, 5.11 (2H, s), 4.33-4.27 (1H, m), 1.90-1.55 (10H, m), 1.51-1.35 (1H, m), 1.28-1.20 (2H, m), 0.93 (3H, d, J 6.9 Hz) and 0.91 (3H, d, J=7.0 Hz).

1. washwas washed with 1M hydrochloric acid, saturated sodium bicarbonate, and brine
2. dry with materialbefore drying over magnesium sulphate, filtration and removal of solvent under reduced pressure