作者:Kazuhiro Kobayashi、Takashi Matsumoto、Susumu Irisawa、Keiichi Yoneda、Osamu Morikawa、Hisatoshi Konishi
DOI:10.3987/com-01-9186
日期:——
The reaction of 1-(2-isocyanophenyl)pyrroles (1), which were readily prepared from commercially available or known 1-(2-aminophenyl)pyrroles by formylation in refluxing ethyl formate followed by dehydration with POCl3/Et3N in THF, with Eschenmoser's salt (2) proceeded smoothly at room temperature to give the dimethyl(pyrrolo[1,2-a]quinoxalin-4-ylmethyl)ammonium iodides (3) in good yields (74-75%). 1-(2-Isocyanophenyl)pyrrole (la) was also found to react with a range of iminium salts (5) and (7), derived from secondary amines and aldehydes in the presence of Me3SiCl/NaI/Et3N, to give 4-(1-dialkylaminoalkyl)pyrrolo[1,2-a]quinoxaline derivatives (6), (8), and (9) in isolated yields ranging from 47 to 99%.