Palladium-Catalyzed Regioselective Arylation of Imidazo[1,2-<i>b</i>][1,2,4]triazine: Synthesis of an α<sub>2/</sub><sub>3</sub>-Selective GABA Agonist
作者:Donald R. Gauthier,、John Limanto、Paul N. Devine、Richard A. Desmond、Ronald H. Szumigala、Bruce S. Foster、R. P. Volante
DOI:10.1021/jo0507035
日期:2005.7.1
A convergent, practical, and efficient synthesis of 2‘,6-difluoro-5‘-[3-(1-hydroxy-1-methylethyl)imidazo[1,2-b][1,2,4]triazin-7-yl]biphenyl-2-carbonitrile (1), an orally active GABAA α2/3-selective agonist, is described. The seven-step, chromatography-free synthesis was demonstrated on a multi-kilogram scale and utilized biaryl bromide 6 and imidazotriazine 22 as key intermediates. Biaryl bromide 6
聚合,实用,高效地合成2',6-二氟-5'-[3-(1-羟基-1-甲基乙基)咪唑并[1,2- b ] [1,2,4]三嗪-7-基]联苯-2-甲腈(1),一种口服活性的GABA甲α 2/ 3 -选择性激动剂,进行说明。七步无色谱合成已在多千克规模上得到证明,并利用了联芳基溴6和咪唑三嗪22作为关键中间体。经由高选择性芳族溴化反应制备联芳基溴化物6。氨基三嗪15与氯乙醛的区域选择性缩合提供了所需的咪唑三嗪中间体22。在最后一步中,具有高度区域选择性的钯催化的芳基化作用突出了该路线的效率。