A New Entry to Pd−H Chemistry: Catalytic Asymmetric Conjugate Reduction of Enones with EtOH and a Highly Enantioselective Synthesis of Warfarin
作者:Yasunori Tsuchiya、Yoshitaka Hamashima、Mikiko Sodeoka
DOI:10.1021/ol0619157
日期:2006.10.1
[reaction: see text] We report here the catalytic asymmetric conjugate reduction of enones using ethanol as a hydride source. The reaction was carried out in the presence of a chiral Pd complex at ambient temperature in ethanol, and the desired products were obtained in high chemical yield and high enantioselectivity. We applied this novel reaction to the catalytic asymmetric synthesis of warfarin (96%
[反应:见正文]我们在此报告使用乙醇作为氢化物源的烯酮的催化不对称共轭还原。该反应在环境温度下在乙醇中在手性Pd络合物的存在下进行,并且以高化学产率和高对映选择性获得期望的产物。我们将此新反应应用于华法林的催化不对称合成(96%ee),并在d标记实验的基础上,提出了反应机理。