Asymmetric Synthesis of (+)-Altholactone: A Styryllactone Isolated from VariousGoniothalamus Species
作者:Dieter Enders、Julien Barbion
DOI:10.1002/chem.200701647
日期:2008.3.17
The asymmetric total synthesis of (+)-altholactone (1), a member of the styryllactone family of natural products displaying cytotoxic and antitumor activities, is described. Key steps include a RAMP-hydrazone alpha-alkylation (RAMP=(R)-1-amino-2-methoxymethylpyrrolidine) of 2,2-dimethyl-1,3-dioxan-5-one, a boron-mediated aldol reaction, a six- to five-membered ring acetonide shuffling, an oxidative
描述了天然产物苯乙烯-内酯家族成员之一的(+)-甲内酯(1)的不对称全合成,显示出细胞毒性和抗肿瘤活性。关键步骤包括2,2-二甲基-1,3-二恶烷-5-酮的RAMP Pα-烷基化反应(RAMP =(R)-1-氨基-2-甲氧基甲基吡咯烷),硼介导的醛醇缩合反应,六元至五元环乙醛改组,氧化的1,5-二醇至δ-内酯转化和立体选择性闭环以生成环构构型的环化四氢呋喃部分。