Synthesis and application of chiral bisphosphines through lithiation–conjugate addition tandem cyclization of chiral α,β,ψ,ω-unsaturated bisphosphine oxide
作者:Yasuo Nagaoka、Hideki Inoue、Nawal El-Koussi、Kiyoshi Tomioka
DOI:10.1039/b109269c
日期:2002.1.18
Upon treatment with lithium diisopropylamide achiral and chiral α,β,Ï,Ï-unsaturated bisphosphine oxides underwent lithiationâconjugate addition tandem cyclization to afford the corresponding endo-α,β-unsaturated cyclic bisphosphine oxides; sequential stereoselective reduction of the cyclized bisphosphine oxide gave the corresponding trans- and cis-bisphosphines that were successfully applicable in a catalytic asymmetric hydrogenation as chiral bisphosphine ligands.
用二异丙基酰胺锂处理非手性和手性δ,δ²,Ï,Ï-不饱和双膦氧化物时,会发生石化-共轭加成串联环化反应,生成相应的内δ,δ²-不饱和环状双膦氧化物;环化双膦氧化物的连续立体选择性还原得到了相应的反式和顺式双膦,这些双膦作为手性双膦配体成功地应用于催化不对称氢化反应。