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 carbonylcompounds 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。
Synthesis of Alkylbismuths by Regiodivergent Carbobismuthination of Simple Alkenes
作者:Yoshihiro Nishimoto、Midori Takeuchi、Makoto Yasuda、Akio Baba
DOI:10.1002/chem.201302194
日期:2013.10.18
Switchable regioselectivity: This study represents the first carbobismuthination of alkenes achieved by the treatment of an alkene with a bismuth halide and a ketene silyl acetal. This reaction is particularly noteworthy in that a change in the type of halogen on a bismuth atom very easily switched the regioselectivity (see scheme).
Regioselective Carboindation of Simple Alkenes with Indium Tribromide and Ketene Silyl Acetals
作者:Yoshihiro Nishimoto、Hiroki Ueda、Yoshihiro Inamoto、Makoto Yasuda、Akio Baba
DOI:10.1021/ol1012108
日期:2010.8.6
The regioselective carboindation of simplealkenes with indium tribromide and ketene silyl acetals was accomplished. Various alkenes such as ethylene, 1-alkenes, and cyclic alkenes were applicable for this reaction system. The alkylindium product from the carboindation of cyclohexene revealed an anti addition mechanism.