Practical syntheses of enantiopure carbasugars: carba-beta-altrose, carba-beta-mannose, carba-beta-idose, and carba-beta-talose derivatives

Abstract

D and L forms of carba-beta-altrose 8, carba-beta-mannose 10a, carba-beta-idose 12, carba-beta-talose 14 derivatives were prepared from (+/-)-3-cyclohexene-1-carboxylic acid 1. Homochiral diol compounds D-5a and L-5a, which were prepared from 1 via enzyme resolution of (+/-)-4a, were efficiently transformed to carba-beta-altrose derivatives 8 by stereoselective introduction of hydroxyl groups. Oxidation (PCC)/reduction (NaBH4) of 3-OH and/or 4-OH of 8a efficiently gave 10a, 12, and 14 with good stereoselectivity. (C) 2004 Elsevier Ltd. All rights reserved.