Improved Air-Stable Solid Aromatic and Heterocyclic Zinc Reagents by Highly Selective Metalations for Negishi Cross-Couplings
作者:Christos I. Stathakis、Sebastian Bernhardt、Valentin Quint、Paul Knochel
DOI:10.1002/anie.201204526
日期:2012.9.10
Directed metalation using TMPMgCl⋅LiCl (TMP=2,2,6,6‐tetramethylpiperidide) and subsequent transmetalation with Zn(OPiv)2 leads to aryl and heteroaryl zinc pivalates. After solvent evaporation, easy‐to‐handle fine powders are obtained that retain most of their activity (>85 %) when exposed to air for 4 h. They smoothly undergo Negishi cross‐couplings, and technical‐grade solvents can be used without
涉及金属化用TMPMgCl ⋅的LiCl(TMP = 2,2,6,6-四甲基)和用Zn(OPiv)随后转移金属化2所导致的芳基和杂芳基锌三甲基乙酸盐。溶剂蒸发后,将获得易于处理的细粉,当暴露于空气中4小时后,这些细粉可保留其大部分活性(> 85%)。它们可以平稳地进行Negishi交叉偶联,并且可以使用工业级溶剂而不会显着降低产量。