First total synthesis and absolute configuration of naturally occurring (−)-hyacinthacine A7 and its (−)-1-epi-isomer
作者:Isidoro Izquierdo、María T. Plaza、Juan A. Tamayo、Víctor Yáñez、Daniele Lo Re、Fernando Sánchez-Cantalejo
DOI:10.1016/j.tet.2008.03.009
日期:2008.5
A convergent synthesis of the naturally occurring alkaloid (−)-hyacinthacine A7, a glycosidase inhibitor of the pyrrolizidine class, is described. The homochiral starting material was tri-orthogonally protected DMDP 10, derived from d-fructose. Key steps of the synthesis were the carbon-chain lengthening at C(5′) in 10 to the α,β-unsaturated pyrrolidine ketone 12 and the one-pot construction of the
描述了天然存在的生物碱(-)-扁豆碱A 7的聚合合成,这是一种吡咯烷核苷类的糖苷酶抑制剂。所述同手性原料是衍生自d-果糖的三正交保护的DMDP 10。合成的关键步骤是在10的C(5')处将碳链延长至α,β-不饱和吡咯烷酮12和一锅法构建的13和14双吡咯烷酮体系。另一个关键步骤是13处C(1)的构型的部分反转,在完全脱保护后,不仅导致天然存在的靶分子9,而且导致其(-)-1-Epi-异构体19。