Mechanistic studies on palladium-catalyzed double carbonylation of aryl iodides affording α-keto esters
作者:Hiroshi Yamashita、Toshiyasu Sakakura、Toshi-Aki Kobayashi、Masato Tanaka
DOI:10.1016/0304-5102(88)85129-0
日期:1988.10
In relation to the mechanism of palladium-catalyzed carbonylation of aryl iodides to give α-keto esters, the carbonylation reactivity of some palladium complexes such as RPdIL2 (I: R = C6H5, L = P(C6H5)3; II: R = C6H5CO, L = P(C6H5)3) and C6H5COPd[P(C6H5)3]2(ClO4)·acetone (III) was investigated. In the carbonylation reaction in the presence of alcohols and t-amines, both complexes I and II exhibited
关于钯催化的芳基碘化物羰基化生成α-酮酯的机理,某些钯配合物如RPdIL 2(I:R = C 6 H 5,L = P(C 6 H 5)的羰基反应性3 ; II:R = C 6 H 5 CO,L = P(C 6 H 5)3)和C 6 H 5 COPd [P(C 6 H 5)3 ] 2(ClO 4)·丙酮(III)进行了调查。在醇和叔胺存在下的羰基化反应中,配合物I和II都显示出相同的反应性。当使用较低介电常数和较低供体数的溶剂时,配合物II对α-酮酯具有更高的选择性。高氯酸盐配合物III在用二乙胺和一氧化碳处理时经历了高羰基化的双羰基化反应,在与一氧化碳的醇反应中主要生成了简单的酯。在配合物II的反应中,将醇与叔胺结合使用可得到α-酮基酯,而使用醇盐可导致仅形成简单的酯。加热复合体II与碘苯在一氧化碳下得到苯甲酰碘。这些结果与催化双羰基化的机理有关。