A New Synthetic Approach to (+)-Hyacinthacine A<sub>1</sub>and the First Total Synthesis and Absolute Configuration Assignment of Naturally Occurring (+)-Hyacinthacine A<sub>6</sub>
作者:Isidoro Izquierdo、María T. Plaza、Juan A. Tamayo、Fernando Sánchez-Cantalejo
DOI:10.1002/ejoc.200700820
日期:2007.12
Naturally occurring (1S,2R,3R,7aR)-1,2-dihydroxy-3-hydroxymethylpyrrolizidine [(+)-hyacinthacine A1 (1)] and(1S,2R,3R,5R,7aR)-1,2-dihydroxy-3-hydroxymethyl-5-methylpyrrolizidine [(+)-hyacinthacine A6 (2)] have been synthesized by Wittig's methodology using aldehyde 7, prepared from (2R,3S,4R,5R)-3,4-bis(benzyloxy)-2′-O-(tert-butyldiphenylsilyl)-2,5-bis(hydroxymethyl)pyrrolidine (3, partially protected
天然存在的 (1S,2R,3R,7aR)-1,2-dihydroxy-3-hydroxymethylpyrrolizidine [(+)-hyacinthacine A1 (1)] 和 (1S,2R,3R,5R,7aR)-1,2-dihydroxy -3-羟甲基-5-甲基吡咯里西啶 [(+)-hyacinthacine A6 (2)] 已通过 Wittig 的方法合成,使用醛 7,由 (2R,3S,4R,5R)-3,4-bis(benzyloxy)-制备2'-O-(叔丁基二苯基甲硅烷基)-2,5-双(羟甲基)吡咯烷(3,部分保护的 DALDP),作为同手性原料和适当的叶立德,得到相应的 α,β-不饱和酯 8 或酮9分别进行内酰胺化和还原胺化,得到相应的中间体pyrrolizidin-5-one 11和完全保护的吡咯里西啶14。化合物11和14分别很容易转化为上述风信子1和2。(© Wiley-VCH