N-annulation of β-ketoenamines by the in-situ generated methyl(methylene)sulfonium ion from the reaction of dimethyl sulfoxide (DMSO) and 1,2-dibromoethane (DBE) was achieved. The β-ketoenamines underwent N-annulation to pyridine derivatives, while the N-alkylated enamines were benzannulated to afford substituted anilines. The utility of the intermediate methyl(methylene)sulfonium ion was further extended for
通过
二甲基亚砜(
DMSO)和
1,2-二溴乙烷(
DBE)的反应原位产生的甲基(亚甲基)锍离子实现了β-酮烯胺的苯环化和N-环化。β-酮烯胺经 N-环化生成
吡啶衍生物,而N-烷基化烯胺经苯环化生成取代的
苯胺。中间体甲基(亚甲基)锍离子的用途进一步扩展用于合成亚甲基桥联双-1,3-二羰基化合物。