New synthetic methods for α,β -unsaturated ketones, aldehydes, esters and lactones by the palladium-catalyzed reactions of silyl enol ethers, ketene silyl acetals, and enol acetates with allyl carbonates
作者:Ichiro Minami、Kazuhiko Takahashi、Isao Shimizu、Tsuneo Kimura、Jiro Tsuji
DOI:10.1016/s0040-4020(01)90587-3
日期:1986.1
Silyl enol ethers and ketene silyl acetals derived from ketones, aldehydes, esters and lactones are converted into α,β-unsaturated ketones, aldehydes, esters and lactones by treatment with allyl carbonates in high yields using the palladium—bis(diphenylphosphino)ethane (dppe) complex as catalyst. Phosphine-free palladium catalyst instead of the palladium—phosphine complex gives a higher selectivity
通过使用钯-双(二苯基膦基)乙烷(dppe)用碳酸烯丙酯进行高收率处理,将由酮,醛,酯和内酯衍生的甲硅烷基烯醇醚和乙烯酮甲硅烷基缩醛转化为α,β-不饱和酮,醛,酯和内酯。 )络合物作为催化剂。不含磷的钯催化剂代替钯-膦配合物为制备环戊烯酮,环辛烯酮,二烯酮,α,β-不饱和酯和内酯提供了更高的选择性。作为溶剂,必不可少的是使用乙腈等腈。在其他溶剂中,发生烯丙基化。通过使用钯配合物和甲醇三丁基锡作为双金属催化剂,通过与乙腈中的碳酸烯丙酯反应,将衍生自酮的烯醇乙酸酯转化为α,β-不饱和酮。