(R,R)-1,2-双[(2-甲氧基苯基)苯基膦]乙烷的合成

A new method for the synthesis of(R,R)-1,2-bis[(dimethoxyphenyl)phenylphosphino]ethane

以苯基二氯化膦为基础原料,经与甲醇反应后发生阿布佐夫重排得到甲基苯基亚膦酸酯,然后与五氯化膦反应生成甲基苯基膦酰氯;甲基苯基膦酰氯与手性辅助试剂5反应,然后再与2-甲氧基苯基溴化镁反应生成具有单一构型的(S)-(2-甲氧基苯基)甲基苯基氧化膦.膦氧化物7经二异丙基氨基锂(LDA)锂化,再通过氯化铜偶联,最后与三氯硅烷和三丁胺反应以89.5%收率和98.3/1.7 dr值(两个非对映异构体的比值)得到目标产物(R,R)-1,2-双[(2-甲氧基苯基)苯基膦]乙烷.

A new method for the synthesis of（R,R）-1,2-bis[（2-methoxyphenyl）phenylphosphino]ethane was developed.Basing on the reaction of Arbuzov rearrangement,methyl methylphenylphosphinate,which was obtained from dichlorophenylphosphine and methyl alcohol,reacted with phosphorus pentachloride to form methylphenylphosphinic chloride.Methylphenylphosphinic chloride successively reacted with oxazolidinone 5 and then with 2-methoxyphenylmagnesiumbromide to get（S）-（2-methoxypheny）methylphenylphosphine oxide as a single configuration.PAMPO 7 was coupled by the action of LDA and copper chloride,and then reduced with trichlorosilane and tributylamine to obtain target product with 89.5% yield and 98.3/1.7 dr value.