An Efficient Protocol for the Palladium-Catalyzed Asymmetric Decarboxylative Allylic Alkylation Using Low Palladium Concentrations and a Palladium(II) Precatalyst
作者:Alexander N. Marziale、Douglas C. Duquette、Robert A. Craig、Kelly E. Kim、Marc Liniger、Yoshitaka Numajiri、Brian M. Stoltz
DOI:10.1002/adsc.201500253
日期:2015.7.6
catalytic allylic alkylation for the synthesis of 2‐alkyl‐2‐allylcycloalkanones and 3,3‐disubstituted pyrrolidinones, piperidinones and piperazinones has been previously reported by our laboratory. The efficient construction of chiral all‐carbon quaternary centers by allylic alkylation was previously achieved with a catalyst derived in situ from zero‐valent palladium sources and chiral phosphinooxazoline
我们实验室先前曾报道过用于合成2-烷基-2-烯丙基环烷酮和3,3-二取代的吡咯烷酮,哌啶子酮和哌嗪子酮的对映选择性催化烯丙基烷基化反应。以前使用零价钯源和手性膦恶唑啉(PHOX)配体原位衍生的催化剂,可以通过烯丙基烷基化有效地构建手性全碳四元中心。现在,我们报告了一种改进的反应方案,该工艺方案在工业相容性反应介质中的不同底物类别之间具有广泛的适用性,使用低至0.075 mol%的乙酸钯(II)以及易于获得的手性PHOX配体。新颖而高效的程序可以经济且可持续的方式轻松扩大反应规模。