Mild and Highly Selective Palladium-Catalyzed Monoarylation of Ammonia Enabled by the Use of Bulky Biarylphosphine Ligands and Palladacycle Precatalysts
作者:Chi Wai Cheung、David S. Surry、Stephen L. Buchwald
DOI:10.1021/ol401612c
日期:2013.7.19
A method for the Pd-catalyzed arylation of ammonia with a wide range of aryl and heteroaryl halides, including challenging five-membered heterocyclic substrates, is described. Excellent selectivity for monoarylation of ammonia to primary arylamines was achieved under mild conditions or at rt by the use of bulky biarylphosphine ligands (L6, L7, and L4) as well as their corresponding aminobiphenyl palladacycle
描述了一种 Pd 催化的氨与多种芳基和杂芳基卤化物的芳基化方法,包括具有挑战性的五元杂环底物。通过使用庞大的联芳膦配体(L6、L7和L4)及其相应的氨基联苯钯环预催化剂(3a、3b和3c),在温和条件下或在室温下实现了将氨单芳基化成伯芳胺的出色选择性。由于该过程既不需要使用手套箱,也不需要高压氨,因此应广泛适用。