An efficient synthesis of 2,3-dideoxy-α,β-unsaturated carbohydrate enals by mixed Lewis acid (HfCl4 and ZnI2) catalyzed hydration of glycals
作者:Mohammad Saquib、Ram Sagar、Arun K. Shaw
DOI:10.1016/j.carres.2006.02.031
日期:2006.6
A new, efficient method has been developed for converting acyl-, arylalkyl- and alkyl-protected glycals into corresponding 2,3 -dideoxy-alpha, beta-unsaturated carbohydrate enals utilizing the in situ generated push-pull effect resulting from the synergistic combination of HfCl4 and ZnI2 in catalytic amounts. This new procedure eliminates the use of highly toxic Hg2+ ions and acidic conditions (0.01-0.02 N H2SO4), besides radically shortening the reaction time. (c) 2006 Elsevier Ltd. All rights reserved.