Tandem electrocyclic ring opening/radical cyclization: application to the total synthesis of cribrostatin 6
作者:Daniel Knueppel、Stephen F. Martin
DOI:10.1016/j.tet.2011.08.064
日期:2011.12
A concise total synthesis of cribrostatin 6 (1), an antimicrobial and antineoplastic agent, was accomplished using a tandem electrocyclic ring opening/radical cyclization sequence. Specifically, intermediate 4 underwent a 4π-electrocyclic ring opening, radical cyclization, and homolytic aromatic substitution sequence followed by an oxidation to afford the natural product 1 in one pot. Owing to the
使用串联电环开环/自由基环化序列完成了一种抗菌剂和抗肿瘤剂克布他汀 6 ( 1 )的简明全合成。具体而言,中间体4经历了 4π-电环开环、自由基环化和均裂芳烃取代序列,然后氧化在一锅中得到天然产物1。由于关键步骤中复杂性的快速积累,1可以从市售的起始材料中仅通过四个线性步骤合成。还报道了该化学在简明合成cribrostatin 6 ( 1 )类似物中的应用。