A comparative study of the solvolysis reactivity, regioselectivity, and stereochemistry of the duocarmycin a and sa alkylation subunits
作者:Dale L. Boger、Joel Goldberg、Jeffrey A. McKie
DOI:10.1016/0960-894x(96)00346-0
日期:1996.8
The comparative solvolysis reactivity, regioselectivity, and stereochemistry of N-BOC-DSA (4) and N-BOC-DA (5), simple derivatives of the DNA alkylation subunits of duocarmycin SA and A, are detailed. Most important of the observations is the substantially greater reactivity of 5 versus 4 (16x), the modest regioselectivity of both 4 (6.5-4:1) and 5 (1.5:1), and the establishment that the abnormal ring expansion solvolysis proceeds by S(N)2 addition to the activated cyclopropane with clean inversion of the reacting center stereochemistry. Copyright (C) 1996 Elsevier Science Ltd