Asymmetric codimerization of cyclohexa-1,3-diene with ethylene catalysed by chiral aminophosphine-nickel complexes
作者:G�rard Buono、Gilbert Peiffer、Andr� Mortreux、Francis Petit
DOI:10.1039/c39800000937
日期:——
The asymmetric codimerization of cyclohexa-1,3-diene with ethylene is catalysed by the Ni(cyclo-octa-1,5-diene)2–AlEt2Cl–L system where L are chiral aminophosphines; optimization of this catalytic system (–70°C; L/Ni = 10) gives (+)-(S)-3-vinylcyclohexene with 73·5% optical purity in 87% chemical yield when (–)-(R)-N-methyl-N-(1-phenylethylamino)diphenyl-phosphine is used.
Ni(环-八-1,5-二烯)2 -AlEt 2 Cl-L体系催化环己-1,3-二烯与乙烯的不对称共聚反应,其中L为手性氨基膦;优化该催化体系(–70°C; L / Ni = 10),得到(+)-(S)-3-乙烯基环己烯,其光学纯度为73·5%,当(–)-(R)-时化学产率为87%使用了N-甲基-N-(1-苯基乙基氨基)二苯基膦。