Reaction of 1-(1H-3-indolyl)-4-(methylthio)-2-(p-tolylsulfonyl)-1,3-butadienes (1) with iodine was accompanied with an unusual 1,2-migration of the sulfonyl group to give an abnormal cyclization product (3). This 1,2-migration reaction was brought about by the action of hydrogen polyiodides that are produced from excess I2 and EtSH. It is noteworthy that the reaction of 1 with HI resulted in formation of a normal product (2).
1-(1H-3-
吲哚基)-4-(甲
硫基)-2-(对
甲苯磺酰基)-
1,3-丁二烯(1)与
碘的反应伴随着磺酰基的异常1,2-移动,生成异常的环化产物(3)。这种1,2-移动反应是由过量的I2和EtSH产生的氢多
碘化物的作用引起的。值得注意的是,1与HI的反应产生了正常产物(2)。