反应详情

33.06 g of lithium aluminum tri-tert.-butoxyhydride were added portionwise at -15° C. to a suspension of 25.57 g of methyl (S)(1-benzyl-3-chloro-2-oxo-propyl)-carbamate in 280 ml of ethanol and the mixture was subsequently hydrolyzed at 0° C. with 140 ml of 3N hydrochloric acid and 170 ml of water. The suspension was concentrated to 370 ml, filtered and the residue was washed with water/ethanol (4:1) and dried, yielding 23.27 g (90%) of isomerically-pure methyl (1S,2S)-(1-benzyl-3-chloro-2-hydroxy- propyl)-carbamate, m.p. 163°-164.5° C. IR (KBr): 3323s, br. (NH, OH), 1689 (C=O), 1546s (amide II).

1. concentrationThe suspension was concentrated to 370 ml
2. filtrationfiltered
3. washthe residue was washed with water/ethanol (4:1)
4. customdried