Palladium(II)-Catalyzed Acetalization of Allylic Acetates and Its Utilization for the Synthesis of 2-Cyanovinyl Ketones
作者:Takahiro Hosokawa、Shunji Aoki、Shun-Ichi Murahashi
DOI:10.1055/s-1992-26165
日期:——
α-Cyanoallyl acetate (1a), when treated with methanol in the presence of bis(acetonitrile)dichloropalladium(II) catalyst, is acetalized at the terminal olefinic carbon to give 1-cyano-3,3-dimethoxypropyl acetate (2). γ-Substituted α-cyanoallyl acetates give 3-substituted 1-cyano-3-oxo-propyl acetates 5 from which 2-cyanovinyl ketones 11 are obtained in good yields.
α-氰基烯丙酸乙酯(1a)在双(乙腈)二氯化钯(II)催化剂存在下用甲醇处理时,在末端烯烃碳处发生缩醛化反应,生成1-氰基-3,3-二甲氧基丙酸乙酯(2)。γ-取代的α-氰基烯丙酸乙酯可得到3-取代的1-氰基-3-氧代丙酸乙酯(5),从中可以良好收率得到2-氰基乙烯基酮(11)。