Preparation of 1,2- and 1,4-diols via selective cleavage of C-benzotriazole bonds in reductive lithiations of N-(α-alkoxy-benzyl- and -allyl-)benzotriazoles
摘要:
Selective cleavage of C-benzotriazole bonds in the presence of C-O bonds is reported for the reductive lithiation of N-(alpha-alkoxybenzyl)benzotriazoles and N-(alpha-alkoxyallyl)benzotriazoles in a one-step or two-step process. Trapping of the intermediates with carbonyl compounds gave unsymmetrically protected 1,2 or 1,4-diols in moderate yields. (C) 1998 Elsevier Science Ltd. All rights reserved.