Novel Synthesis of 3,4,4-Trisubstituted Thiadiazolines from 3,4-Diphenyl-1,2,5-Thiadiazole 1,1-Dioxide. Competition with the Intra-Molecular Aryl-Aryl Cyclization of 3,4-Diphenyl-1,2,5-Thiadiazole 1,1-Dioxide
作者:Enrique J. Vasini、María F. Rozas、Oscar E. Piro、Eduardo. E. Castellano、María V. Mirífico
DOI:10.1055/s-2002-35219
日期:——
quantitative intramolecular cyclization reaction (Scholl reaction 1 ) of 1 to phenanthro[9,10-c]-1,2,5-thiadiazole 1,1-dioxide (3), took place. Both reactions occur through the intermediation of a strong electrophile formed by 1 and aluminum trichloride. Spectral data and structure (through single-crystal X-ray diffraction, with the exception ol 2c) were measured for all new compounds.
3,4-二苯基-1,2,5-噻二唑 1,1-二氧化物 (1) 反应。在无水三氯化铝存在下,芳香亲核试剂具有电子供体取代基,以良好的收率得到新的(2a-e,图 1)3,4,4-三取代 1,2,5-噻二唑啉 1,1-二氧化物。在三氯化铝存在但不添加亲核试剂的情况下,1 到菲 [9,10-c]-1,2,5-噻二唑 1,1 的分子内环化反应(Scholl 反应 1)较慢,但实际上是定量的-二氧化(3),发生。这两种反应都是通过由 1 和三氯化铝形成的强亲电试剂介导的。测量了所有新化合物的光谱数据和结构(通过单晶 X 射线衍射,ol 2c 除外)。