The carbinol acetals 2a-h obtained by 1,2-addition of propargylmagnesium bromide to acyclic α-oxoketene dithioacetals 1a-h undergo cycloaromatization in the presence of trimethyl borate/methanol to give 2,5-bis(alkylthio)biphenyls 4a-henic oxy-Cope rearrangement and an unprecedented 1,4-alkylthio shift in the resulting allenic intermediate.
的
甲醇缩醛2A-H通过1,2-加成而得到propargylmagnesium
溴化物无环α -oxoketene二
硫1A-H经历cycloaromatization在
硼酸三甲酯/
甲醇洗脱,得到2,5-双(烷
硫基)
联苯的存在下4A-H ENIC氧化-Cope重排和空前的1,4-烷
硫基转移在所得的烯丙基中间体中。