Lewis Acid-Promoted Reactions of 3-Methoxy-<i>N</i>-(benzenesulfonyl)-1,4-benzoquinone Monoimine with Propenylbenzenes
作者:Thomas A. Engler、Cynthia M. Scheibe
DOI:10.1021/jo980502j
日期:1998.9.1
OEt(2)-promoted reactions of 4-N-(benzenesulfonyl)-3-methoxy-1,4-benzoquinone monoimine (5) with (E)-propenylbenzenes bearing strong electron-donating groups on their aromaric rings produce 2-aryl-6-methoxy-3-methyl-5-[N-(benzenesulfonyl)amino]-2,3-diydrobenzofurans (6). With neutral propenylbenzenes, either the dihydrobenzofurans, bicyclo[3.2.1]octenediones 17, or products of tandem cycloaddition (7-9) are