Enantioposition-selective arylation of biaryl ditriflates by palladium-catalyzed asymmetric Grignard cross-coupling
作者:Takashi Kamikawa、Tamio Hayashi
DOI:10.1016/s0040-4020(98)01154-5
日期:1999.3
Asymmetric cross-coupling of achiral biaryl ditriflates with aryl Grignard reagents in the presence of 1 equiv of lithium bromide and 5 mol % of palladium complex PdCl2[(S)-alaphos], where alaphos stands for (2-dimethylamino)propyldiphenylphosphine, gave axially chiral monophenylation products with high enantioposition-selectivity. The remaining triflate group in the monophenylation products was substituted
在1当量的溴化锂和5 mol%的钯络合物PdCl 2 [(S)-alaphos]存在下,非手性联芳基二triflates与芳基格氏试剂的不对称交叉偶联,其中alaphos代表(2-二甲基氨基)丙基二苯基膦具有高对映选择性的轴向手性单苯基化产物。单苯基化产物中剩余的三氟甲磺酸酯基团分别通过钯催化的羰基化和二苯基膦基化被羧基和二苯基膦基取代。