Asymmetric Synthesis of Tertiary α-Hydroxy Phosphonic Acid Derivatives under Aerobic Oxidation Conditions
作者:Biplab Maji、Hisashi Yamamoto
DOI:10.1055/s-0034-1380290
日期:——
The copper-catalyzed asymmetric α-hydroxylation of β-ketophosphonates, using in situ generated nitrosocarbonyl compounds as electrophilic source of oxygen, is reported. The reaction mergesaerobicoxidation and Lewis acid catalysis. α-Aminoxy-β-ketophosphonates were synthesized in high yields (up to 97% yield) and high enantioselectivities (up to >99% ee).
Platinum/Copper Dual‐Catalyzed Asymmetric Vinylogous Addition Reactions for the Synthesis of Functionalized Indoles
作者:Qingdong Hu、Chang Guo
DOI:10.1002/anie.202305638
日期:2023.7.24
An efficient platinum/copper dual-catalyzed asymmetric vinylogous addition reaction has been developed. This efficient process provides a novel approach for the asymmetricsynthesis of highly valuable indoles bearing a quaternary stereocenter with excellent enantioselectivity (up to 99 % ee).
An Easy Approach to Optically Active α-Amino Phosphonic Acid Derivatives by Chiral Zn(II)-Catalyzed Enantioselective Amination of Phosphonates
作者:Luca Bernardi、Wei Zhuang、Karl Anker Jørgensen
DOI:10.1021/ja050989v
日期:2005.4.1
A catalytic direct enantioselective electrophilic amination of beta-keto phosphonates has been developed applying chiral bisoxazoline-zinc(II) complexes as the catalyst. The reaction proceeds well for both acyclic and cyclic substrates in high yields and with up to 98% ee using azodicarboxylates as the nitrogen source. The scope of the reaction is, for example, the further transformation to optically active beta-hydroxy-alpha-amino phosphonates with very high stereoselection.
BOECKMAN, ROBERT K.;WALTERS, MICHAEL A.;KOYANO, HIROSHI, TETRAHEDRON LETT., 30,(1989) N6, C. 4787-4790
作者:BOECKMAN, ROBERT K.、WALTERS, MICHAEL A.、KOYANO, HIROSHI