Model intermolecular asymmetric Heck reactions catalyzed by chiral pyridyloxazoline palladium(II) complexes
作者:David W. Dodd、Heather E. Toews、Florentino d.S. Carneiro、Michael C. Jennings、Nathan D. Jones
DOI:10.1016/j.ica.2005.11.025
日期:2006.6
The synthesis and characterization of a series of chiral pyridyloxazoline Pd(II) halide complexes, including structural determinations, are described. The use of these compounds, as well as those generated in situ from Pd(OAc)2 and 2 equiv. of a pyridyloxazoline ligand, in the intermolecular asymmetric Heck arylation of 2,3-dihydrofuran is reported. In general, total yields after 24 h at 40 °C of the
摘要描述了一系列手性吡啶基恶唑啉Pd(II)卤化物配合物的合成和表征,包括结构测定。这些化合物的使用,以及从Pd(OAc)2和2当量就地生成的化合物的使用。据报道,吡啶基恶唑啉配体在2,3-二氢呋喃的分子间不对称Heck芳基化中。通常,动力学和热力学产物在40°C下24小时后的总收率较低,分别为2-苯基-2,5-二氢呋喃和2-苯基-2,3-二氢呋喃。而ee(当使用PhOTf作为芳基源时)的动力学动力学系数较低(4–29%),而热力学产品的系数适中(23–60%)。容易的催化剂分解损害了收率和ee。发现热力学比动力学产物的ee高,这意味着动力学拆分。