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。