A new facet of the reaction of nitro heteroaromatic compounds with ethyl isocyanoacetate
作者:Takashi Murashima、Ken-ichi Fujita、Kazuo Ono、Takuji Ogawa、Hidemitsu Uno、Noboru Ono
DOI:10.1039/p19960001403
日期:——
heteroarenes react with ethyl isocyanoacetate in the presence of 1,8-diazabicyclo[5.4.0]undecene (DBU) to give pyrroles or pyrimidine N-oxide depending on the structure of the starting nitrocompounds. For example, 4-nitro-2,1,3-benzothiadiazole 3a reacted with ethyl isocyanoacetate to give ethyl 2,1,3-benzothiadiazole[3,4-c]pyrrole-2-carboxylate 4a (33%), while a similar reaction with 5-nitro-2,1,3-benzothiadiazole