Asymmetric Allylation of Unsymmetrical 1,3-Diketones Using a BINAP−Palladium Catalyst
作者:Ryoichi Kuwano、Kei-ichi Uchida、Yoshihiko Ito
DOI:10.1021/ol034665s
日期:2003.6.1
[reaction: see text] The chiral palladium complex generated in situ from [Pd(eta(3)-allyl)Cl](2) and (R)-BINAP is a good catalyst for the catalytic asymmetric allylation of 1,3-diketones. The reaction provided chiral 2,2-dialkyl-1,3-diketones with 64-89% ee in high yields (13 examples). Enantiomeric excesses are strongly affected by the gamma-substituent of the allylic substrates. A variety of unsymmetrical
[反应:参见正文]由[Pd(eta(3)-烯丙基)Cl](2)和(R)-BINAP原位生成的手性钯配合物是1,3-二酮催化不对称烯丙基化的良好催化剂。该反应以高收率提供了具有64-89%ee的手性2,2-二烷基-1,3-二酮(13个实例)。对映体过量强烈地受到烯丙基底物的γ-取代基的影响。通过使用BINAP-钯催化剂(77-89%ee),将多种不对称的1,3-二酮与乙酸肉桂酯烷基化,并具有良好的对映选择性。