Scope and Utility of a New Soluble Copper Catalyst [CuBr−LiSPh−LiBr−THF]: A Comparison with Other Copper Catalysts in Their Ability to Couple One Equivalent of a Grignard Reagent with an Alkyl Sulfonate
作者:Dennis H. Burns、Jeffrey D. Miller、Ho-Kit Chan、Michael O. Delaney
DOI:10.1021/ja963944q
日期:1997.3.1
THF at 0 °C furnished a new soluble copper catalyst that was highly efficient at coupling primary, secondary, tertiary, aryl, vinyl, and allylic Grignard reagents to primary tosylates and primary Grignard reagents to secondary tosylates and mesylates, all with the use of only 1 equiv of Grignard reagent. The new catalyst was shown to be much more reactive than copper catalysts CuBr and Li2CuCl4 and more
等量的 CuBr−SMe2、LiBr 和 LiSPh 在 0°C 的 THF 中的混合物提供了一种新的可溶性铜催化剂,该催化剂在将伯、仲、叔、芳基、乙烯基和烯丙基格氏试剂与伯甲苯磺酸盐和主要格氏试剂到二级甲苯磺酸盐和甲磺酸盐,所有这些都只使用 1 当量的格氏试剂。新催化剂被证明比铜催化剂 CuBr 和 Li2CuCl4 更具反应性,并且在转移仲和叔烷基方面比低级铜酸盐(吉尔曼试剂)更有效,并且表现出比低级铜酸盐更高的反应性及其偶联能力初级格氏试剂到次级磺酸盐。格氏试剂/催化剂系统与酯官能化甲苯磺酸酯相容,因此证明比没有催化剂的格氏试剂更具化学选择性。该催化剂在室温以下表现出良好的反应活性,并且在催化剂溶液中加入6% v/v的HMPA...