An Efficient Synthesis of 2,4-Disubstituted Quinolines by Electrophile-Mediated Cyclization Reactions of 2-Isocyanostyrene Derivatives
作者:Kazuhiro Kobayashi、Kenichi Takagoshi、Shizuka Kondo、Osamu Morikawa、Hisatoshi Konishi
DOI:10.1246/bcsj.77.553
日期:2004.3
A novel quinoline synthesis starting with 2-isocyanostyrene derivatives is described. The treatment of 2-isocyanostyrene derivatives with aldehydes (or acetone) in the presence of a catalytic amount of diethyl ether-borontrifluoride afforded quinoline derivatives carrying a 1-hydroxyalkyl substituent at the 2-position. The use of acetaldehyde diethyl acetal or phenyloxirane as an electrophile under
描述了一种从 2-异氰基苯乙烯衍生物开始的新型喹啉合成。在催化量的二乙醚-三氟化硼存在下用醛(或丙酮)处理2-异氰基苯乙烯衍生物,得到在2-位带有1-羟基烷基取代基的喹啉衍生物。在相同条件下使用乙醛二乙基乙缩醛或苯基环氧乙烷作为亲电子试剂得到相应的喹啉衍生物,分别在 2-位带有 1-乙氧基乙基或 2-羟基-2-苯乙基取代基。2-异氰基苯乙烯衍生物在没有任何催化剂的情况下与 N,N-二甲基亚胺盐反应得到 2-(1-二甲基氨基烷基)喹啉。