Photo-mediated synthesis of halogenated spiro[4,5]trienones of <i>N</i>-aryl alkynamides with PhI(OCOCF<sub>3</sub>)<sub>2</sub> and KBr/KCl
作者:Tong Liu、Yaming Li、Linlin Jiang、Jiaao Wang、Kun Jin、Rong Zhang、Chunying Duan
DOI:10.1039/d0ob00057d
日期:——
spirocyclization of N-(p-methoxyaryl)propiolamides has been developed. The photolysis of phenyliodine bis(trifluoroacetate) (PIFA) as an iodination reagent led to iodinated ipso-cyclization under the irradiation of a xenon lamp, while brominated ipso-cyclization or chlorinated ipso-cyclization was achieved by irradiating a mixture of PIFA and KBr/KCl under a blue LED. The present protocol simply utilizes
已经开发出新颖且方便的N-(对甲氧基芳基)丙酰胺的光介导的卤代螺环化。苯碘双(三氟乙酸盐)(PIFA)作为碘化试剂的光解在氙灯的照射下导致碘化ipso环化,而溴化的ipso环化或氯化的ipso环化则通过照射PIFA和KBr / KCl在蓝色LED下。本协议只是利用光作为安全,清洁的能源,不需要任何外部光催化剂即可提供各种3-卤代螺[4,5]三烯酮,产率高至优异(高达93%)。