Efficient and selective Stille cross-coupling of benzylic and allylic bromides using bromobis(triphenylphosphine)(N-succinimide)palladium(II)
作者:Catherine M. Crawforth、Ian J.S. Fairlamb、Richard J.K. Taylor
DOI:10.1016/j.tetlet.2003.11.014
日期:2004.1
[Pd(NCOC2H4CO)(PPh3)2Br] 1. Significantly, these reactions do not require the use of hexamethylphosphoramide (HMPA) as the solvent, or additional ligands, such as trifurylphosphine or triphenylarsine. Selectivity for benzyl bromide over bromobenzene is observed for precatalyst 1, against the precatalysts, bromobis(triphenylphosphine)(benzyl)palladium(II) and bis(triphenylphosphine)palladium(II) bromide.
使用预催化剂[Pd(NCOC 2 H 4 CO)(PPh 3)2 Br] 1可以使烯丙基和苄基溴与有机锡烷交联。重要的是,这些反应不需要使用六甲基磷酰胺(HMPA)作为溶剂,也不需要使用其他配体,例如三糠基膦或三苯基ar。对于预催化剂1,观察到苄基溴对溴苯的选择性相对于预催化剂溴双(三苯基膦)(苄基)钯(II)和双(三苯基膦)钯(II)。