Synthesis of Diastereomerically Pure [1,3]Thiazolo[3,2-a]azepane Derivatives from d-Hexoses
作者:Delphine Marek、Anne Wadouachi、Daniel Beaupère
DOI:10.1055/s-1999-3474
日期:1999.5
Reaction of cysteamine with protected d-hexoses yielded the corresponding thiazolidines. The thiazolidine derived from 2,3; 5,6-di-O-isopropylidene-d-mannofuranose was obtained stereoselectively and a subsequent N-heterocyclisation led to a diastereomerically pure analogue of pyrrolizidine. Alternatively, a "one-pot" procedure for synthesis of pure [1,3]thiazolo[3,2-a]azepane derivatives was realized from 6-O-sulfonyl-d-hexoses.
半胱胺与受保护的 d-己糖反应生成了相应的噻唑烷。从 2,3;5,6-二-O-异亚丙基-d-曼呋喃糖中得到的噻唑烷具有立体选择性,随后的 N-异环化反应产生了非对映纯的吡咯烷类似物。另外,还实现了从 6-O-磺酰基-d-己糖合成纯[1,3]噻唑并[3,2-a]氮杂环庚烷衍生物的 "一步法 "程序。