Toward a Protecting-Group-Free Halogen−Metal Exchange Reaction: Practical, Chemoselective Metalation of Functionalized Aromatic Halides Using Dianion-type Zincate, <i><sup>t</sup></i>Bu<sub>4</sub>ZnLi<sub>2</sub>
作者:Masanobu Uchiyama、Taniyuki Furuyama、Minoru Kobayashi、Yotaro Matsumoto、Kentaro Tanaka
DOI:10.1021/ja058246x
日期:2006.7.1
preparation method for aromatic zincate compounds through a halogen-zinc exchange reaction using dilithium tetra-tert-butylzincate (tBu4ZnLi2) has been developed. This reagent permits efficient preparation of highly functionalized aromatic zincates, particularly, those with electrophilic functional groups, such as ester, amide, alcohol, and phenol. Halogen-zinc exchange reactions followed by electrophilic trapping
已经开发了一种使用四叔丁基锌酸二锂 (tBu4ZnLi2) 通过卤素-锌交换反应制备芳香锌酸盐化合物的通用方法。该试剂可以有效制备高度官能化的芳香族锌酸盐,特别是具有亲电官能团的那些,如酯、酰胺、醇和苯酚。卤素-锌交换反应和亲电捕获(使用烯丙基溴或苯甲醛)被证明是在功能化芳环上形成 CC 键的有力工具。还发现官能化的芳族锌酸盐中间体以良好的产率和高化学选择性进行铜和钯催化的 CC 键形成反应。