New Gilman-type lithium cuprate from a copper(II) salt: synthesis and deprotonative cupration of aromatics
作者:Tan Tai Nguyen、Floris Chevallier、Viatcheslav Jouikov、Florence Mongin
DOI:10.1016/j.tetlet.2009.09.100
日期:2009.12
including heterocycles (anisole, 1,4-dimethoxybenzene, thiophene, furan, 2-fluoropyridine, 2-chloropyridine, 2-bromopyridine, and 2,4-dimethoxypyrimidine) was realized in tetrahydrofuran at room temperature using the Gilman-type amido-cuprate (TMP)2CuLi in situ prepared from CuCl2·TMEDA through successive addition of 1 equiv of butyllithium and 2 equiv of LiTMP. The intermediate lithium (hetero)arylcuprates
室温下,使用吉尔曼型在四氢呋喃中实现了包括杂环(苯甲醚,1,4-二甲氧基苯,噻吩,呋喃,2-氟吡啶,2-氯吡啶,2-溴吡啶和2,4-二甲氧基嘧啶)在内的芳族化合物的去质子化。通过连续加入1当量的丁基锂和2当量的LiTMP,由CuCl 2 ·TMEDA原位制备酰胺基铜酸盐(TMP)2 CuLi 。通过捕获碘,烯丙基溴,甲基碘和苯甲酰氯,可以证明中间的(杂)芳基碳酸锂。还使用硝基苯作为氧化剂,由azine嗪锂和二嗪铜酸盐制备对称二聚体。