The reductive carboxylation of α,β-unsaturated carbonyl compounds with carbon dioxide was studied. After the screening of various transition-metal complex catalysts and reducing agents, it was found that the combination of bis(acetylacetonato)cobalt(II) and diethylzinc could effectively afford the corresponding α-carboxylate in high yield from α,β-unsaturated nitriles. The product was obtained after esterification by trimethylsilyldiazomethane. The highly selective carboxylation was observed at the α-position in the present study.
研究了 α、β-不饱和羰基化合物与
二氧化碳的还原羧化反应。经过对多种过渡
金属复合物催化剂和还原剂的筛选,发现双(
乙酰丙酮)
钴(II)和
二乙基锌的组合能有效地从α,β-不饱和
腈类化合物中高产率地得到相应的α-
羧酸盐。该产品通过三甲基
硅基二氮
甲烷酯化后获得。本研究在 α 位观察到了高选择性的羧化反应。