Electrophile-induced bromocyclization of γ,δ-unsaturated ketimines to intermediate 1-pyrrolinium salts and their selective conversion into novel 5-alkoxymethyl-2-aryl-3-chloropyrroles and 2-aroylpyrroles
作者:Matthias D'hooghe、Christophe Buyck、Jan Contreras、Norbert De Kimpe
DOI:10.1039/b813890g
日期:——
N-(1-Aryl-2,2-dichloropent-4-enylidene)amines were efficiently transformed into 5-bromomethyl-1-pyrrolinium bromides via electrophile-induced bromocyclization. The latter pyrrolinium salts were converted into novel 5-alkoxymethyl-2-aryl-3-chloropyrroles by reaction with alkoxides in the corresponding alcohol or in THF. This chemistry clearly deviates from the corresponding gamma,delta-unsaturated alpha
N-(1-芳基-2,2-二氯戊-4-亚乙烯基)胺经亲电试剂诱导的溴环化反应有效地转化为5-溴甲基-1-吡咯啉溴化物。通过在相应的醇中或在THF中与醇盐反应,将后者的吡咯鎓盐转化为新的5-烷氧基甲基-2-芳基-3-氯吡咯。在相似的条件下,这种化学反应显然偏离了相应的γ,δ-不饱和的α,α-二烷基亚胺。此外,在水中用氢氧化钠处理5-溴甲基-1-吡咯鎓溴化物,通过中间体氮丙啶衍生物的意外环转化提供了新的进入2-芳酰基吡咯的途径,该中间体也可以被分离。