Reactions of ketene aminals with n-arylmaleimides and dimethyl acetylenedicarboxylate, a direct pathway to derivatives of pyrrolo[1,2-a]imidazole and imidazo[1,2-a]pyridine
作者:V. D. Orlov、Yu. V. Kharchenko、I. M. Gella、I. V. Omel’chenko、O. V. Shishkin
DOI:10.1007/s10593-012-1123-y
日期:2012.11
N-arylmaleimides or dimethyl acetylenedicarboxylate to 2-imidazolideneacetophenones proceeds at the most nucleophilic carbon atom of the acetophenone derivatives and results in a rearrangement to give derivatives of 5-oxo-2,3,5,6-tetrahydro-1H-pyrrolo[1,2-a]imidazole or imidazo[1,2-a]pyridine, respectively. In the case of 2-imidazolidenecyclopentanones and 2-imidazolidine-cyclohexanones, the reaction terminates
将N-芳基马来酰亚胺或乙酰二羧酸二甲酯添加到2-咪唑并苯乙酮基苯乙酮衍生物的最亲核碳原子上,并导致重排生成5-oxo-2,3,5,6-tetrahydro-1H-pyrrolo衍生物分别为[1,2-a]咪唑或咪唑并[1,2-a]吡啶。在2-咪唑啉基环戊酮和2-咪唑烷-环己酮的情况下,反应在咪唑啉系统的氮原子上加入酰亚胺或乙酰二羧酸二甲基二甲酯而终止。