Addition of allylmagnesium chloride to protected L-xylofuranosylamine gave, after intramolecular cyclization, the corresponding polyhydroxylated 2-allylpyrrolidines. New series of analogues of (+)-alexine and (+)-australine were readily obtained from these intermediates by dihydroxylation, intramolecular nucleophilic displacement and subsequent deprotection. The determination of the configuration at
在分子内环化后,将烯
丙基氯化镁加到被保护的L-木
呋喃糖基胺中,得到相应的多羟基化的2-烯丙基
吡咯烷。通过二羟基化,分子内亲核取代和随后的脱保护作用,可以很容易地从这些中间体中获得新的(+)-alexine和(+)-australine系列类似物。基于NMR实验确定在新形成的立体中心的构型。(©Wiley-
VCH Verlag GmbH,69451 Weinheim,Germany,2002)