Polyhydroxylated pyrrolizidines. Part 3: A new and short enantiospecific synthesis of (+)-hyacinthacine A2
作者:Isidoro Izquierdo、Marı́a T. Plaza、Francisco Franco
DOI:10.1016/j.tetasy.2003.09.042
日期:2003.12
(1R,2R,3R,7aR)-1,2-Dihydroxy-3-hydroxymethylpyrrolizidine (+)-Hyacinthacine A21 has been synthesized by Wittig's methodology using [(2′S,3′R,4′R,5′R)-3′,4′-dibenzyloxy-N-tert-butyloxycarbonyl-5′-tert-butyldiphenylsilyloxymethylpyrrolidin-2′-yl]carbaldehyde 3, prepared from a partially protected DMDP 2, and the appropriated ylide, followed by cyclization by an internal reductive amination process of
(1 R,2 R,3 R,7a R)-1,2-二羟基-3-羟甲基吡咯烷嗪(+)-Hycinthathacine A 2 1已通过Wittig的方法使用[(2 'S,3'R,4' [R,5' - [R)-3',4'- dibenzyloxy- ñ -叔丁氧基羰基-5'-叔-butyldiphenylsilyloxymethylpyrrolidin -2'-基]甲醛3,从部分保护的DMDP制备2和拨叶立德,然后通过内部还原胺化过程环化生成的不饱和醛4 和完全脱保护。