Highly Diastereoselective Heterogeneously Catalyzed Hydrogenation of Enamines for the Synthesis of Chiral β-Amino Acid Derivatives
摘要:
Pure (Z)-enamines readily prepared from beta-ketoesters and amides using (S)-phenylglycine amide were hydrogenated with very high diastereoselectivities (up to 200:1) using heterogeneous catalysis. Hydrogenolytic cleavage of the (S)-phenylglycine amide afforded the corresponding chiral beta-aminoesters and amides. The high geometrical purity of the (Z)-enamine and a simple activation procedure for the PtO2 catalyst are essential in achieving high selectivity.
Practical and simple catalyticenantioselectivehydrogenation reactions to synthesize N-unprotected β-amino esters have been developed: (1) asymmetrichydrogenation of N-unprotected β-enamine ester and (2) asymmetric direct reductiveamination of β-keto esters using ammonium salts. A Ru–DM-SEGPHOS complex was used as the catalyst in both cases and gave high enantioselectivity, high reactivity, and
[EN] SUBSTITUTED N-[(AMINOIMINOMETHYL OR AMINOMETHYL)PHENYL]PROPYL AMIDES<br/>[FR] N-[(AMINOIMINOMETHYLE OU AMINOMETHYLE)PHENYLE]PROPYLAMIDES A SUBSTITUTION
申请人:RHONE-POULENC RORER PHARMACEUTICALS INC.
公开号:WO1997024118A1
公开(公告)日:1997-07-10
(EN) The compounds according to the invention are substituted N-[(aminoiminomethyl or aminomethyl)phenyl]propyl amides of formula (I) herein which exhibit useful pharmacological activity and accordingly are incorporated into pharmaceutical compositions and used in the treatment of patients suffering from certain medical disorders. More especially, they are Factor Xa inhibitors. The present invention is directed to compounds of formula (I), compositions containing compounds of formula (I), methods for their preparation and their use, which are for treating a patient suffering from, or subject to, conditions which can be ameliorated by the administration of an inhibitor of Factor Xa.(FR) Composés constitués par des N-[(aminoiminométhyle ou aminométhyle)phényle]propylamides à substitution de la formule (I) exerçant une activité utile sur le plan pharmacologique et de ce fait incorporés dans des compositions pharmaceutiques pour le traitement de patients souffrants de certains troubles pathologiques. Ces composés sont plus spécialement des inhibiteurs du facteur Xa. L'invention porte sur des composés de la formule (I), des compositions contenant des composés de la formule (I), des méthodes de préparation et d'utilisation de ces composés pour le traitement d'un patient souffrant d'états pouvant être améliorés par l'administration d'un inhibiteur du facteur Xa.
Asymmetric reductive amination of keto acid derivatives for producing amino acid derivatives
申请人:Matsumura Kazuhiko
公开号:US20070142443A1
公开(公告)日:2007-06-21
The present invention relates to a process for producing amino acid derivatives such as optically active β-amino acid in short steps with good yield and high optical purity, which comprises reacting a keto acid of the formula (1):
wherein R
1
is hydrogen, an optionally substituted hydrocarbon, etc.; R
2
is a spacer; and R
3
is an optionally substituted alkoxy, etc., or a salt thereof, with ammonia or an amine or a salt thereof in the presence of a chiral catalyst and in the presence or absence of an acid and/or a fluorine-containing alcohol, to give an amino acid derivative of the formula (2):
wherein Q is a group formed by removing one hydrogen atom from ammonia or an amine; X′ is an acid and/or a fluorine-containing alcohol; and b is 0 or 1.
[EN] ASYMMETRIC REDUCTIVE AMINATION OF KETO ACID DERIVATIVES FOR PRODUCING AMINO ACID DERIVATIVES<br/>[FR] PROCEDE DE PRODUCTION DE DERIVES D'ACIDES AMINES
申请人:TAKASAGO PERFUMERY CO LTD
公开号:WO2005028419A3
公开(公告)日:2005-06-02
ASYMMETRIC REDUCTIVE AMINATION OF KETO ACID DERIVATIVES FOR PRODUCING AMINO ACID DERIVATIVES