1,2-Sulphur shift in the acid-catalysed cyclisation of o-arylthiophenyl-substituted carbinols to thioxanthen derivatives
作者:Giuseppe Capozzi、Giovanni Melloni、Giorgio Modena
DOI:10.1039/p19730002250
日期:——
During the acid-catalysed cyclisation of some o-arylthiophenyl-substituted carbinols to thioxanthen derivatives, arearrangement was observed with carbinols having a para-methyl substituentin thearylthio-group. Thus, 1-[o-(p-tolylthio)phenyl]ethanol gave 3,9-dimethylthioxanthen, while α-[o-(p-tolylthio)phenyl]benzyl alcohol gave a mixture of 3-methyl- and 2-methyl-9-phenylthioxanthen. The mechanism
在一些邻-芳基硫基苯基取代的甲醇的酸催化环化为噻吨酮衍生物的过程中,观察到芳基硫基中具有对甲基取代基的甲醇的排列。因此,1- [邻-(对甲苯硫基)苯基]乙醇给出了3,9-二甲基噻吨,而α-[邻-(对甲苯硫基)苯基]苄醇得到了3-甲基-和2-甲基-的混合物。 9-苯基噻吨。环化的机理在位置闭环之间的竞争方面所讨论的邻位的硫(邻闭环3'-取代),并且在位置带有硫接着是1,2-硫移(ipso -substitution)。