Aryl Ring Migration Reaction in the Synthesis of 2,4-Diaryl-4H-3,1-benzothiazines
作者:Alexander Butin、Fatima Tsiunchik、Vladimir Abaev、Andrey Gutnov、Dmitry Cheshkov
DOI:10.1055/s-0029-1217399
日期:2009.8
thiocarbamoylation reaction also takes place, and 5,11-dihydro-6H-dibenzo[b,e]azepine-5-thiones are isolated as byproducts. Factors influencing the mechanism and selectivity of the reaction are discussed. The corresponding 1-(arylmethyl)-2-isothiocyanatobenzene derivatives were also synthesized, and their behavior under Friedel-Crafts reaction conditions was investigated to confirm the crucial role
描述了1-(二芳基甲基)-2-异硫氰酸根合苯到2,4-二芳基-4 H -3,1-苯并噻嗪衍生物的新的重排。在Friedel-Crafts条件下用三氯化铝处理起始化合物导致芳基取代基通过亲电的ipso取代机理迁移,然后环化形成3,1-苯并噻嗪环。预期的分子内硫代氨基甲酰化反应也会发生,并且5,11-dihydro-6 H -dibenzo [ b,e分离出[]氮杂-5-硫酮副产物。讨论了影响反应机理和选择性的因素。还合成了相应的1-(芳基甲基)-2-异硫氰酸根合苯衍生物,并研究了它们在Friedel-Crafts反应条件下的行为,以证实中间体二苯甲基/苄基阳离子的稳定性在确定反应过程中的关键作用。 1-(二芳基甲基)-2-异硫氰酸根合苯-Friedel-Crafts-重排-芳基迁移-3,1-苯并噻嗪