Generation of Organozinc Reagents by Nickel Diazadiene Complex Catalyzed Zinc Insertion into Aryl Sulfonates
作者:Philippe Klein、Vivien Denise Lechner、Tanja Schimmel、Lukas Hintermann
DOI:10.1002/chem.201904545
日期:2020.1.2
ArX electrophiles has typically been restricted to iodides and bromides. The insertions of zinc dust into the C-O bonds of various aryl sulfonates (tosylates, mesylates, triflates, sulfamates), or into the C-X bonds of other moderate electrophiles (X=Cl, SMe) are catalyzed by a simple NiCl2 -1,4-diazadiene catalyst system, in which 1,4-diazadiene (DAD) stands for diacetyl diimines, phenanthroline, bipyridine
通过将锌直接插入ArX亲电试剂的CX键中来生成芳基锌试剂(ArZnX)通常仅限于碘化物和溴化物。锌粉插入各种芳基磺酸盐(甲苯磺酸盐,甲磺酸盐,三氟甲磺酸盐,磺酸盐)的CO键中,或插入其他中等亲电试剂(X = Cl,SMe)的CX键中均通过简单的NiCl2 -1,4-催化二氮杂二烯催化剂体系,其中1,4-二氮杂二烯(DAD)代表二乙酰基二亚胺,菲咯啉,联吡啶和相关配体。现在,在室温下在DMF或NMP溶液中进行催化锌化可提供芳基锌磺酸盐,这些芳基锌磺酸盐会经历典型的催化交叉偶联或亲电取代反应。