Tuning the Basicity of a Metal-Templated Brønsted Base to Facilitate the Enantioselective Sulfa-Michael Addition of Aliphatic Thiols to α,β-Unsaturated<i>N</i>-Acylpyrazoles
作者:Xiaobing Ding、Cheng Tian、Ying Hu、Lei Gong、Eric Meggers
DOI:10.1002/ejoc.201501494
日期:2016.2
The enantioselective addition of aliphatic thiols to α,β-unsaturated N-acylpyrazoles catalyzed by a bis-cyclometalated iridium(III) complex with fine-tuned Bronsted basicity was investigated. Good to excellent yields (71–99 %) and enantioselectivities (86–98 % ee) were achieved at catalyst loadings of 0.2–2.5 mol-%. In this metal-templated catalyst design, the metal serves as a structural center and
研究了在具有微调布朗斯台德碱度的双环金属化铱 (III) 配合物催化下脂肪族硫醇与 α,β-不饱和 N-酰基吡唑的对映选择性加成。在 0.2-2.5 mol-% 的催化剂负载量下实现了良好到极好的产率 (71-99%) 和对映选择性 (86-98% ee)。在这种金属模板催化剂设计中,金属作为结构中心,催化由有机配体球通过质子转移、氢键形成和静电相互作用的组合来执行。