coupling strategy for the synthesis of a structurally defined polymer of 1,3-propanediamine, and the polymer can be used for the synthesis of both the initially proposed structure and the revised structure of protoaculeine B isolated from a marine sponge. We first attempted the synthesis of polyamines using “the Ns strategy” but found that a polyamine with eleven Ns groups has solubility problems. We
Total synthesis of polyamine toxin HO-416b utilizing the 2-nitrobenzenesulfonamide protecting group
作者:Yuko Hidai、Toshiyuki Kan、Tohru Fukuyama
DOI:10.1016/s0040-4039(99)00851-5
日期:1999.6
The total synthesis of HO-416b (1) was accomplished using the 2-nitrobenzenesulfonamide (Ns) group as both a protecting and activating group. Starting with monosulfonylated diamines 2 and 3, three C-N bonds were constructed via alkylation of sulfonamides with alkyl halides. Removal of the Ns groups while the substrate was attached to a novel solid support enabled the efficient isolation of pure 1. (C) 1999 Elsevier Science Ltd. All rights reserved.