Chelation-Controlled Addition of Organozincs to α-Chloro Aldimines
作者:Gretchen R. Stanton、Per-Ola Norrby、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1021/ja306781z
日期:2012.10.24
report is C-X bonds reversing the diastereoselectivity throughcoordination to metals during C-C bond-forming reactions (chelationcontrol). Herein we describe chelationcontrol involving C-X bonds in highly diastereoselective additions of organozinc reagents to a variety of α-chloro aldimines. The unique ability of alkylzinc halide Lewisacids to coordinate to the Cl, N, and O of α-chloro sulfonyl
众所周知,α-手性 α-卤代羰基衍生物的亲核加成可通过非螯合途径生成 Cornforth-Evans 产物。在本报告之前前所未有的是 CX 键通过在 CC 键形成反应(螯合控制)期间与金属配位来逆转非对映选择性。在此,我们描述了在将有机锌试剂高度非对映选择性添加到各种 α-氯醛亚胺中时涉及 CX 键的螯合控制。计算研究支持烷基锌卤化物路易斯酸与 α-氯磺酰基亚胺底物的 Cl、N 和 O 配位的独特能力。