Regioselective Synthesis of 4-(Aryloxymethyl)Thiopyrano [2,3-B][1]Benzothiopyran-5(2H)-Ones
作者:K. C Majumdar、A. T. Khan、S. Sana
DOI:10.1080/00397919208020854
日期:1992.3
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)。