Reactions of 2-aryl-1,4-benzoquinones with disodium (2,2-dicyano-1,1-ethylene)dithiolate gave rise either to 1,3-benzodithiol or 1,3-benzoxathiol depending on the character of the aryl substituent. 2-Aryl-1,4-benzoquinones reacted with 3-methylsulfanyl-3-sulfanyl-2-cyanoacrylamide with a higher selectivity: 2-(7-Aryl-5-hydroxy-1,3-benzoxathiol-2-ylidene)-2-cyanoacetamides were obtained in a high yield.
根据芳基取代基的特性,2-芳基-1,4-苯醌与(2,2-二
氰基-1,
1-乙烯)二
硫醇二钠盐反应生成
1,3-苯并二硫醇或 1,3-苯并噁
硫醇。2-芳基-1,4-苯醌与 3-甲
硫基-3-
硫酰基-2-
氰基
丙烯酰胺的反应选择性更高:可以高产率获得 2-(7-芳基-5-羟基-1,3-苯并恶
硫醇-2-亚基)-2-
氰基乙酰胺。