Nitrogen- and Phosphorus-Containing Lewis Base Catalyzed [4+2] and [3+2] Annulation Reactions of Isatins with But-3-yn-2-one
作者:Zhong Lian、Min Shi
DOI:10.1002/ejoc.201101338
日期:2012.1
Nitrogen- and phosphorus-containing Lewis base catalyzed [4+2] and [3+2] annulations of isatins with but-3-yn-2-one proceeded smoothly to give the corresponding spiro[indoline-3,2′-pyran]-2,4′(3′H)-diones and spiro[furan-2,3′-indoline]-2′,4(5H)-diones in good-to-excellent yields under mild conditions. The substrate scope has been carefully examined. Moreover, the additive effect of water has also been