作者:Jihène Ben Kraïem、Taïcir Ben Ayed、Hassen Amri
DOI:10.1016/j.tetlet.2006.07.093
日期:2006.9
Reaction of 2,4-diketoesters 3a–c with aqueous formaldehyde using potassium carbonate solution as base affords the corresponding α-methylene-β-hydroxyalkanones 4a–c which provide a route to α,β-unsaturated alkyl ketones 6a–e via coupling of α-acetoxymethyl alkyl vinyl ketone 5a with Grignard reagents in the presence of a catalytic amount of LiCuBr2 at low temperature.
2,4-二酮酸酯3a - c与甲醛水溶液以碳酸钾溶液为碱进行反应,得到相应的α-亚甲基-β-羟基链烷酮4a - c,它通过以下反应偶联生成α,β-不饱和烷基酮6a - e。在低温下,在催化量的LiCuBr 2存在下,使用格氏试剂的α-乙酰氧基甲基烷基乙烯基酮5a。