Chemo- and diastereoselective Bi(OTf)3-catalyzed benzylation of silyl nucleophiles
作者:Philipp Rubenbauer、Thorsten Bach
DOI:10.1016/j.tetlet.2007.12.092
日期:2008.2
The direct alkylation of silyl enol ethers with para-methoxybenzylic alcohols or their corresponding acetates was efficiently catalyzed by Bi(OTf)3 in CH3NO2 as the solvent. The reaction provided the α-benzylated carbonyl compounds in high yields after short reaction times using 1–2.5 mol % of the catalyst. Benzylic acetates other than para-methoxybenzylic acetates also underwent the reaction. High
Bi(OTf)3在作为溶剂的CH 3 NO 2中有效地催化了甲硅烷基烯醇醚与对甲氧基苄醇或其相应的乙酸酯的直接烷基化。使用1–2.5 mol%的催化剂,反应在较短的反应时间后即可以高收率得到α-苄基羰基化合物。除对甲氧基苄基乙酸酯以外的乙酸苄酯也进行了反应。用衍生自手性α-支化对-甲氧基苄醇的乙酸酯观察到高的非对映选择性。另外,据报道用Et 3 SiH作为还原剂进行催化还原。