Pd-catalyzed enantioselective synthesis of quaternary α-amino acid derivatives using a phenylalanine-derived P-chirogenic diaminophosphine oxide
摘要:
A Pd-catalyzed enantio selective synthesis of quaternary alpha-amino acid derivatives using a phenylalanine-derived P-chirogenic diaminophosphine oxide is described. Asymmetric allylic substitution using acyclic beta-keto esters with a nitrogen functional group at the alpha-carbon as prochiral nucleophiles proceeded in the presence of 5 mol % of Pd catalyst, 10 mol % of chiral diaminophosphine oxide 1j, BSA, and appropriate additives, affording the corresponding quaternary alpha-amino acid derivatives in excellent yield and in up to 92% ee. (c) 2007 Elsevier Ltd. All rights reserved.
The present invention is directed to oxazole compounds which are antagonists of orexin receptors. The present invention is also directed to uses of the oxazole compounds described herein in the potential treatment or prevention of neurological and psychiatric disorders and diseases in which orexin receptors are involved. The present invention is also directed to pharmaceutical compositions comprising these compounds. The present invention is also directed to uses of these pharmaceutical compositions in the prevention or treatment of such diseases in which orexin receptors are involved.
METHOD FOR PREPARING (2RS)-AMINO-(3S)-HYDROXY-BUTYRIC ACID AND ITS DERIVATIVES
申请人:AMINOLOGICS Co., Ltd.
公开号:US20160017389A1
公开(公告)日:2016-01-21
The present invention relates to a method for easily preparing (2RS)-amino-(3S)-hydroxy-butyric acid, which is a chiral amino acid, in a high yield and a high purity using a chemical synthesis and enzymatic reduction reaction; an intermediate therefor; and a method for preparing the intermediate.
A practical synthesis of α-acylamino-β-keto-esters: Acylation of alkyl hydrogen (acylamino)malonates via the MgCl2/R3N base system
作者:Damian J. Krysan
DOI:10.1016/0040-4039(96)00581-3
日期:1996.5
An operationally simple procedure for the synthesis of α-acylamino-β-keto-esters has been devised using a MgCl2/R3Nbasesystem to generate the magnesium enolates of a series of alkylhydrogen (acylamino)malonates. These reagents smoothly react at 0 °C with a variety of acid chlorides to give α-acylamino-β-keto-esters in good to excellent yields. In addition to being quite convenient and versatile
已经设计了使用MgCl 2 / R 3 N碱系统合成α-酰基氨基-β-酮基酯的操作简单的程序,以生成一系列烷基氢(酰基氨基)丙二酸烯醇镁。这些试剂可在0°C下与各种酰氯平稳反应,从而以良好或极佳的收率得到α-酰基氨基-β-酮酸酯。除了对于小规模制备非常方便和通用之外,该方法还应该非常适合于这种重要分子类别的大规模合成。
Method of Preparing a Ring Compound Having Two Adjacent Chiral Centers
申请人:Schultze M. Lisa
公开号:US20070276145A1
公开(公告)日:2007-11-29
A method of synthesizing a chiral compound having a quaternary carbon atom bearing diastereotopic groups from (a) a nitroolefin and (b) an α-substituted β-dicarbonyl or an equivalent compound having an acidic C—H moiety compound is disclosed. A subsequent intramolecular reaction between one of the substituents comprising the stereogenic carbon atom and one of the diastereotopic groups comprising the quaternary carbon atom creates a new compound having two contiguous stereogenic centers, one of which is quaternary, with control over the relative stereochemistry.
The present invention is directed to compounds of the Formula I
as well as pharmaceutically acceptable salts thereof, that are potentially useful for treating aldosterone-mediated diseases. The invention furthermore relates to processes for preparing compounds of the Formula I, to their possible use in the treatment of the abovementioned diseases and for preparing pharmaceuticals for this purpose, and to pharmaceutical compositions which comprise compounds of the Formula I.