A New Approach to Pyrrolocoumarin Derivatives by Palladium-Catalyzed Reactions: Expedient Construction of Polycyclic Lamellarin Scaffold
作者:Lei Chen、Ming-Hua Xu
DOI:10.1002/adsc.200900287
日期:2009.8
A new and efficient protocol for straightforward synthesis of chromeno[3,4-b]pyrrol-4(3H)-one derivatives by palladium-catalyzed sequential coupling/cyclization reactions has been developed. The key strategy relies on creation of pyrrole ring through palladium-catalyzed intramolecular hydroamination of related acetylenic aminocoumarins. The synthetic utility of the obtained chromeno[3,4-b]pyrrol-4(3H)-one
开发了一种新的有效协议,可以通过钯催化的顺序偶联/环化反应直接合成chromeno [3,4- b ] pyrrol-4(3 H)-one衍生物。关键策略依赖于通过钯催化相关炔属氨基香豆素的分子内加氢胺化来形成吡咯环。通过四步法方便地合成多环lamellarin支架,已证明了所获得的chromeno [3,4- b ]吡咯-4(3 H)-产物的合成效用。它为合成潜在有价值的lamellarin类似物提供了新的机会。