transfer catalysed alkylation of 4-hydroxy dithiocoumarin (3) with a number of 1-aryloxy-4-chloro-but-2-ynes (4) furnished several 2-(4′-aryloxy-but-2′-ynyl thio)-[1]-benzothiopyran-4-ones (5) which when heated in chlorobenzene gave hitherto unreported 4-(aryloxymethyl)thiopyrano[2,3-b] benzothiopyran-5(2H)-ones (2) in excellent yields.
摘要
4-羟基二
硫香豆素 (3) 与许多 1-芳氧基-4-
氯-丁-2-炔 (4) 的相转移催化烷基化提供了几个 2-(4'-芳氧基-丁-2'-炔基
硫)-[1]-benzothiopyran-4-ones (5),当在
氯苯中加热时,以极好的收率得到迄今为止未报道的 4-(芳氧基甲基)thiopyrano[2,3-b] benzothiopyran-5(2H)-ones (2)。