Synthesis of 8,9-(1,3-benzodioxolo-5,6)-5-azatricyclo[8.2.1.01,5]tridec-11-en-6-one. A convenient route to structural analogs of the alkaloid cephalotaxine
作者:N. Yu. Kuznetsov、I. V. Zhun’、V. N. Khrustalev、Yu. N. Bubnov
DOI:10.1007/s11172-006-0103-8
日期:2005.9
A synthetic route to 8,9-(1,3-benzodioxolo-5,6)-5-azatricyclo[8.2.1.01,5]tridec-11-en-6-one structurally isomeric to the pentacyclic cephalotaxine nucleus is suggested. The route is based on the sequence including diallylboration of 2-pyrrolidinone and intramolecular metathesis of the resulting 2,2-diallylpyrrolidine, giving rise to 1-azaspiro[4.4]non-7-ene. This product was N-acylated with 6-bromohomopiperonylic acid chloride and then subjected to intramolecular cyclization according to the Heck reaction.
提出了一种 8,9-(1,3-苯并二恶茂-5,6)-5-氮杂三环[8.2.1.01,5]十三烷-11-烯-6-酮的合成路线,其结构与五环头孢他辛核同构。该路线基于 2-吡咯烷酮的二烯丙基硼化和生成的 2,2-二烯丙基吡咯烷的分子内偏析,从而得到 1-氮杂螺[4.4]壬-7-烯。该产物与 6-溴高哌啶酰氯进行 N-酰化,然后按照 Heck 反应进行分子内环化。