Palladium(II) catalyzed carbonylative dimerization of allenyl ketones: efficient synthesis of difuranylketones
作者:Keisuke Kato、Tomoyuki Mochida、Hiroyuki Takayama、Masayuki Kimura、Hiroshi Moriyama、Akihito Takeshita、Yuichro Kanno、Yoshio Inouye、Hiroyuki Akita
DOI:10.1016/j.tetlet.2009.06.016
日期:2009.8
catalyzed carbonylation of 1,2-allenyl ketones 1 in the presence of p-benzoquinone (1 equiv) under a CO atmosphere (balloon) afforded difuranylketones 4 in moderate to good yields. Mechanistically, the electron-withdrawing nature of the acyl group should enhance the electrophilicity of the acylpalladium species B, and thus promote the oxypalladation of an additional molecule of 1, leading to the difuranyl
在CO气氛(气球)下,在对苯甲醌(1当量)存在下,钯(II)催化1,2-烯基酮1的羰基化反应生成了二呋喃基酮4。从机理上讲,酰基的吸电子性质应增强酰基铝物种B的亲电性,从而促进另外一个分子1的氧钯化,从而生成二呋喃基酮4。