Synthese de dienes-1,3 et de styrenes fonctionnalises par carbopalladation catalytique d'allenes
作者:Mohammed Ahmar、Bernard Cazes、Jacques Gore
DOI:10.1016/s0040-4039(01)81478-7
日期:1984.1
The palladium (O) catalyzed reaction of aryl and vinyl halides with allenes in the presence of sodium ethyl malonate leads with good yields and in certain cases with high stereoselectivity to styrenes and 1,3-butadienes derivatives.
AHMAR MOHAMMED; BARIEUX J. -J.; CAZES B.; GORE J., TETRAHEDRON, 43,(1987) N 3, 513-526
作者:AHMAR MOHAMMED、 BARIEUX J. -J.、 CAZES B.、 GORE J.
DOI:——
日期:——
Carbopalladation of allenic hydrocarbons.
作者:Mohammed Ahmar、Jean-Jacques Barieux、Bernard Cazes、Jacques Gore
DOI:10.1016/s0040-4020(01)89984-1
日期:1987.1
palladium-catalyzed coupling reaction of allenes, vinyl or aryl halides and stabilized carbanions is described : π-allyl palladium complexes are formed by addition of a vinyl or an aryl-palladium complex to an allenic hydrocarbon and trapped by the sodium enolate of diethyl malonate giving rise with good yields to β-butadienyl or β-styryl malonates. With monoalkyi allenes, the reaction is regiospecific with attack
描述了丙烯,乙烯基或芳基卤化物和稳定化碳负离子的钯催化偶联反应:π-烯丙基钯配合物是通过将乙烯基或芳基-钯配合物添加到烯丙烃中形成的,并被丙二酸二乙酯的烯醇化钠捕获β-丁二烯基或β-苯乙烯基丙二酸酯的收率高。对于单烷基亚丙基,该反应是区域特异性的,亲核试剂攻击中间的π-烯丙基配合物的未取代的碳,并且在许多情况下具有高度立体选择性,主要形成二烯的三取代双键的E构型。使用NOE差光谱法通过1 H NMR证明了该构型。