Asymmetric alkynylation of aldehydes with propiolates without high reagent loading and any additives
作者:Naoto Kojima、Shogo Nishijima、Kaoru Tsuge、Tetsuaki Tanaka
DOI:10.1039/c1ob05489a
日期:——
The asymmetric alkynylation of aliphatic and aromatic aldehydes with propiolates was mediated by dialkylzinc and a novel prolinol catalyst without high reagent loading and any additives, such as Ti(Oi-Pr)4, to give the corresponding γ-hydroxy-α,β-acetylenic esters with high enantiomeric excess of up to 95%.
用丙酮酸酯对脂肪族和芳香醛进行不对称炔基化反应,借助于二烷基锌和一种新型脯氨醇催化剂,且不需要高反应物用量和任何添加剂,如Ti(Oi-Pr)4,从而高效地产生相应的γ-羟基-α,β-炔烃酯,具有高达95%的对映体过剩。