摘要:
N-Cyanomethyl and N-propargyl beta-amino alcohols are chlorinated with SOCl2 and treated with NaN3 in DMSO. A Substitution/cycloaddition process affords in good yields, with high diastereoselectivity and a regioselectivity depending on the substitution pattern of the starting amino alcohol, fused tri- and tetrazoles-pipci-azines. These heterocycles were further lithiated with n-BuLi at the benzylic position and reacted diastereoselectively with a range of electrophiles. (C) 2004 Elsevier Ltd. All rights reserved.