Dioxirane oxidation of substituted vinylphosphonates: a novel efficient route to 1,2-epoxyalkylphosphonates
摘要:
A new stereoselective route to substituted 1,2-epoxyalkylphosphonates through oxidation of corresponding alk-1-enylphosphonates by 'in situ' generated ethylmethyldioxirane is described. (C) 1998 Elsevier Science S.A. All rights reserved.
首次实现了β,β-二芳基不饱和膦酸酯的不对称氢化,用于在Rh-( R , R )-f-spiroPhos 络合物催化下合成具有优异对映选择性(高达99.9% ee)的β,β-二芳基手性膦酸酯. 此外,该催化剂对 β-芳基-β-烷基不饱和膦酸酯也表现出相当优异的性能,提供相应的手性膦酸酯,其 ee 值高达 99.9%。这种方法为不对称合成手性膦酸盐提供了一种直接的途径。
Stereoselective syntheses of mono-, di- and trisubstituted diethyl alk-l-enylphosphonates, starting from readily available alk-1ynylphosphonates, have been developed, using catalytic hydrogenation or cuprate addition on the triple bond.
A stereoselective synthesis of disubstituted diethyl alk-1-enylphosphonates has been developed via syn addition of RMgX/CuCl to alk-1-inylphosphonates.