2-Chloropyridazin-3(2<i>H</i>)-ones as Electrophilic Chlorinating Agents: Effective α-Chlorination of Active Methylene/Methine Compounds
作者:Yong-Jin Yoon、Yong-Dae Park、Jeum-Jong Kim、Su-Dong Cho、Sang-Gyeong Lee、J. Russell Falck
DOI:10.1055/s-2005-861845
日期:——
2,4,5-Trichloro- (2a) and 2,4-dichloro-5-methoxypyridazin-3(2H)-one (2b) are novel electrophilic chlorinating agents. α-Chlorination of active methylene/methine compounds with 2 in the presence of either Lewis or protonicacids in dichloromethane (for Lewis acid) or water (for protonic acid or none) at room temperature gave also selectively α-monochlorides and/or a,a-dichlorides in good to excellent
2,4,5-Trichloro- (2a) 和 2,4-dichloro-5-methoxypyridazin-3(2H)-one (2b) 是新型亲电氯化剂。在室温下,在二氯甲烷(对于路易斯酸)或水(对于质子酸或无质子酸)中存在路易斯或质子酸的情况下,活性亚甲基/次甲基化合物与 2 的 α-氯化也可选择性地产生 α-一氯化物和/或 a,a -二氯化物产率良好至极好。