Stereoselective syntheses of substituted pterocarpans with anti-HIV activity, and 5-aza-/5-thia-pterocarpan and 2-aryl-2,3-dihydrobenzofuran analogues
作者:Thomas A. Engler、Kenneth O. LaTessa、Rajesh Iyengar、Wenying Chai、Konstantinos Agrios
DOI:10.1016/0968-0896(96)00192-7
日期:1996.10
Oxygenated pterocarpans and 5-azapterocarpans are prepared utilizing Lewis acid-promoted reactions of 2-alkoxy-1,4-benzoquinones with 2H-chromenes and N-tosyl-3,2-dihydroquinolines, respectively. Similarly, benzannulated analogues are prepared via reactions of 5-alkoxy-1,4-naphthoquinones with chromenes, and related 2-aryl-2,3-dihydrobenzofurans result from reactions of styrenes with the quinones. Syntheses of 5-thiapterocarpans are also described utilizing Pd(0)-coupling of o-chloromercuriophenols with 2H-chromenes. Copyright (C) 1996 Elsevier Science Ltd