Reaction of Acetals with Various Carbon Nucleophiles under Non-Acidic Conditions: CC Bond Formation via a Pyridinium-Type Salt
作者:Hiromichi Fujioka、Kenzo Yahata、Tomohito Hamada、Ozora Kubo、Takashi Okitsu、Yoshinari Sawama、Takuya Ohnaka、Tomohiro Maegawa、Yasuyuki Kita
DOI:10.1002/asia.201100812
日期:2012.2.6
substitution reactions of acetals with carbon nucleophiles via the pyridinium‐type salts generated by the treatment of acetals with TESOTf‐2,4,6‐collidine or 2,2′‐bipyridyl have been developed. Various carbon nucleophiles, such as organocuprates, silyl enol ethers, enamines, etc., reacted with the pyridinium‐type salts to give the corresponding substituted products in good yields. The reactions proceeded
已经开发出乙醛与碳亲核试剂通过通过用TESOTf-2,4,6-可力丁或2,2'-联吡啶基处理乙缩醛而生成的吡啶鎓类盐进行的轻度取代反应。各种碳亲核试剂,例如有机铜酸酯,甲硅烷基烯醇醚,烯胺等,与吡啶鎓盐类反应生成高收率的相应取代产物。反应在非常温和的条件下(非酸性条件)进行,因此在反应过程中可以耐受酸敏感性官能团。此外,只有缩醛可以形成吡啶鎓盐,并在存在缩酮的情况下与亲核试剂反应。这种不寻常的选择性与在酸性条件下进行的常规方法形成对比。