Dynamic Kinetic Resolution in Rhodium-Catalyzed Asymmetric Arylation of Phospholene Oxides
作者:Kelvin Meng-Hui Lim、Tamio Hayashi
DOI:10.1021/jacs.7b04570
日期:2017.6.21
The reaction of 2,5-dihydro-1H-phosphole 1-oxide 1 with ArB(pin) 3 in the presence of a chiral (R)-segphos–rhodium catalyst under highly basic conditions (10 equiv of KOH) gave high yields of (1S,3S)-3-arylphospholane 1-oxide 4 with high diastereoselectivity as well as high enantioselectivity. Equilibration of 1 with its 2,3-dihydro isomer 2, which is chiral and racemic, by base-catalyzed olefin isomerization
在高碱性条件(10当量的KOH)下,在手性(R)-segphos-铑催化剂的存在下,2,5-二氢-1 H-磷化氢1-氧化物1与ArB(pin)3的反应产生了高收率高非对映选择性和高对映选择性的(1 S,3 S)-3-芳基膦烷1-氧化物4的合成。通过碱催化的烯烃异构化使1与2,3-二氢异构体2(手性和外消旋)平衡,然后用手性铑催化剂进行2的动力学拆分,实现了目前的动态动力学拆分。