Synthesis of naturally occurring iminosugars from d-fructose by the use of a zinc-mediated fragmentation reaction
作者:Anne Lauritsen、Robert Madsen
DOI:10.1039/b605818c
日期:——
A short synthesis of 1,4-dideoxy-1,4-imino-D-arabinitol (DAB) and a formal synthesis of australine are described. In both cases, D-fructose is employed as the starting material and converted into a protected methyl 6-deoxy-6-iodo-furanoside. Zinc-mediated fragmentation produces an unsaturated ketone which serves as a key building block for both syntheses. Ozonolysis, reductive amination with benzylamine
描述了1,4-二脱氧-1,4-亚氨基-D-阿拉伯糖醇(DAB)的简短合成和Australine的形式合成。在两种情况下,都将D-果糖用作起始原料,并转化为受保护的甲基6-脱氧-6-碘-呋喃糖苷。锌介导的断裂产生不饱和酮,该酮是两种合成的关键组成部分。臭氧分解,用苄胺还原胺化并脱保护,仅需7个步骤,即可得到1,4-二脱氧-1,4-亚氨基-D-阿拉伯糖醇,D-果糖的总收率为11%。或者,用高烯丙胺的还原胺化,闭环复分解和保护基团的操作产生了一种中间体,该中间体可以在3个步骤中转化为澳曲林。中间体是通过两种不同的策略制备的,这两种策略总共使用9个步骤。