作者:Melissa Moss、Xinping Han、Joseph M. Ready
DOI:10.1002/anie.201603133
日期:2016.8.16
a benzylic group, or an alkyl group that possesses a tertiary or quaternary carbon atom α to the carbon–zirconium bond can not be formed in this way. To provide more generalized access to acyl zirconium reagents, we explored the transmetalation of Grignard reagents with zirconocene dichloride under a CO atmosphere. This protocol generates acyl zirconium(IV) complexes that are inaccessible with the Schwartz
有机锆茂是一种通用的合成中间体,可以进行羰基化反应以生成酰基阴离子当量。盐酸锆茂([Cp 2ZrHCl])通常是获得这些中间体的首选试剂,但仅从烯烃和炔烃中生成有机锆茂。该要求消除了多种基材。例如,不能以这种方式形成锆中心键合到芳环,苄基或在碳-锆键上具有叔或季碳原子α的烷基的有机锆茂。为了更广泛地获取酰基锆试剂,我们探索了在CO气氛下用二氯化锆对格氏试剂的金属转移。该方案生成Schwartz试剂无法访问的酰基锆(IV)络合物,包括衍生自仲,叔烷基和芳基格氏试剂的那些。