Palladium/Tetraphosphine Catalysed Heck Reaction with ortho-Substituted Aryl Bromides
作者:Marie Feuerstein、Henri Doucet、Maurice Santelli
DOI:10.1055/s-2001-18752
日期:——
The tetraphosphine cis,cis,cis-1,2,3,4-tetrakis(diphenylphosphinomethyl)cyclopentane associated to [PdCl(C3H5)]2 catalyses the Heck reaction of butyl acrylate with a wide range of sterically demanding aryl bromides, furnishing the addition product in high yields. Turnover numbers as high as 630-89 000 have been obtained using ortho-substituted aryl bromides and 43-2600 with di-ortho-substituted aryl bromides in the presence of this catalyst.
四膦化合物 cis,cis,cis-1,2,3,4-四(二苯基膦甲基)环戊烷与 [PdCl(C3H5)]2 结合,催化了丁基丙烯酸酯与多种空间位阻较大的芳基溴化物的 Heck 反应,产物收率很高。使用 ortho-取代芳基溴化物时,循环次数高达 630-89 000,而在此催化剂存在下,使用二-ortho-取代芳基溴化物时循环次数为 43-2600。