Functionalization of a Pyridine Framework through Intramolecular Reissert-Henze Reaction of<i>N</i>-(Carbamoyloxy)pyridinium Salts and Unexpected Insertion of Ethereal Solvents
作者:Haruyasu Asahara、Asuka Kataoka、Shotaro Hirao、Nagatoshi Nishiwaki
DOI:10.1002/ejoc.201500443
日期:2015.6
new intramolecular transformation of an acyloxy group from N-carbamoyloxypyridinium salts (Reissert–Henze-type reaction) as the key step. Addition of a silver salt effectively accelerates the intramolecular attack of the carbonyl oxygen at the 2-position of the pyridine ring. Additionally, a new rearrangement of the acyloxy group, combined with insertion of an ethereal solvent to give pyridine derivatives
报道了合成 2-吡啶基氨基甲酸酯的新策略。该策略利用来自 N-氨基甲酰氧基吡啶鎓盐(Reissert-Henze 型反应)的酰氧基的新分子内转化作为关键步骤。添加银盐可有效加速吡啶环 2 位羰基氧的分子内攻击。此外,还报道了酰氧基的新重排,结合醚溶剂的插入,得到具有配位链的吡啶衍生物。