Synthesis of the Parent and Substituted Tetracyclic ABCD Ring Cores of Camptothecins via 1-(3-Aryl-2-propynyl)- 1,6-dihydro-6-oxo-2-pyridinecarbonitriles
作者:Weixiang Dai、Jeffrey L. Petersen、Kung K. Wang
DOI:10.1021/ol0620242
日期:2006.9.1
pathway to the parent and substituted ABCD ring cores of the camptothecin family of alkaloids was developed. The N-alkylation of 1,6-dihydro-6-oxo-2-pyridinecarbonitrile (2) with 3-bromo-1-phenylpropyne provided 3a using Curran's protocol. Treatment of 3a with a catalytic amount of DBU (5 mol %) at 110 degrees C for 12 h produced indolizino[1,2-b]quinolin-9(11H)-one (6a), the parent ABCD ring core of camptothecin
喜树碱喜树碱家族的亲本和取代ABCD环核心的新合成途径被开发。1,6-二氢-6-氧代-2-吡啶甲腈(2)与3-溴-1-苯基丙炔的N-烷基化使用Curran协议提供了3a。在110摄氏度下用催化量的DBU(5摩尔%)处理3a 12小时,生成喜树碱的母体ABCD环核吲哚并[1,2-b]喹啉9(11H)-一(6a),基本定量的产量。