Enantioselective synthesis of α-hydroxy phosphonates via oxidation with (camphorsulfonyl)oxaziridines
摘要:
Reaction of phosphonate anions with enantiomerically pure (camphorsulfonyl)oxaziridines results in formation of nonracemic alpha-hydroxy phosphonates. This enantioselective hydroxylation methodology provides convenient access to optically active alpha-hydroxy phosphonates and their corresponding phosphonic acids. (C) 1997 Elsevier Science Ltd.
The dimethyl phosphonate hydrophosphonylation of conjugated‐ and non‐conjugated aldehydes into their corresponding α‐hydroxy phosphonates was achieved using chiral aluminum–salalen complex 1 (see scheme).
Synthesis of an Optically Active Al(salalen) Complex and Its Application to Catalytic Hydrophosphonylation of Aldehydes and Aldimines
作者:Bunnai Saito、Hiromichi Egami、Tsutomu Katsuki
DOI:10.1021/ja0651005
日期:2007.2.1
serve as an efficient catalyst for hydrophosphonylation of aldehydes and aldimines, giving the corresponding alpha-hydroxy and alpha-amino phosphonates with high enantioselectivity, respectively. The scope of the hydrophosphonylation was wide, and both aliphatic and aromatic aldehydes and aldimines were successfully used as substrates for the reaction. The potent catalysis of the complex is attributed to
Organocatalytic enantioselective hydrophosphonylation of aldehydes
作者:Juan V. Alegre-Requena、Eugenia Marqués-López、Pablo J. Sanz Miguel、Raquel P. Herrera
DOI:10.1039/c3ob42403k
日期:——
our results concerning the first squaramide-catalysed hydrophosphonylation of aldehydes. In all cases, the reactions proceeded smoothly and cleanly under mild reaction conditions rendering final α-hydroxy phosphonates in very good yields and high enantioselectivities. It is one of the few organocatalytic examples of this reaction using aldehydes. It is the first time that diphenylphosphite (1e) has
Process for preparing asymmetric compound by using metal complex
申请人:Nagase & Company, Ltd.
公开号:US05847186A1
公开(公告)日:1998-12-08
A process for producing an asymmetric compound using a metal complex containing no rare earth metal element is disclosed. The process affords an optically active compound having high optical purity. Optically active binaphthol having the chemical formula ##STR1## and lithium aluminum hydride are reacted, or the optically active binaphthol, a dialkyl aluminum hydride, and a base containing an alkali metal (or a base containing alkaline earth metal) are reacted to prepare a metal complex comprising optically active binaphthol, aluminum, and alkali metal (or alkaline earth metal). This metal complex can be used as a catalyst to perform an asymmetric Michael reaction, an asymmetric phosphonylation reaction, or the like, to obtain, in a high yield, an asymmetric compound having high optical purity.
Process for the preparation of an asymmetric compound using a metal
申请人:Nagase and Co., Ltd.
公开号:US06090969A1
公开(公告)日:2000-07-18
A process for producing an asymmetric compound using a metal complex containing no rare earth metal element is disclosed. The process affords an optically active compound having high optical purity. Optically active binaphthol having the chemical formula and lithium aluminum hydride are reacted, or the optically active binaphthol, a dialkyl aluminum hydride, and a base containing an alkali metal (or a base containing alkaline earth metal) are reacted to prepare a metal complex comprising optically active binaphthol, aluminum, and alkali metal (or alkaline earth metal). This metal complex can be used as a catalyst to perform an asymmetric Michael reaction, an asymmetric phosphonylation reaction, or the like, to obtain, in a high yield, an asymmetric compound having high optical purity.