Highly efficient and facile synthesis of β-enaminones catalyzed by diphenylammonium triflate
作者:Ting-Ting Zhao、Jiang-Long Song、Feng-Qing Hong、Jian-Sheng Xia、Jian-Jun Li
DOI:10.1007/s11696-019-00838-2
日期:2019.11
The catalytic performance of diphenylammonium triflates as an organocatalyst in the synthesis of β-enaminones from various substituted β-diketones and amides (or amines) were evaluated. A wide range of β-enaminones were efficiently synthesized in good to excellent yields under mild reaction conditions. Applying diphenylammonium triflate (DPAT) as catalyst makes this protocol cost-effective, low corrosive and easy to handle.
[EN] PROCESS AND INTERMEDIATES FOR THE PREPARATION OF N-ACYLATED-4-ARYL BETA-AMINO ACID DERIVATIVES<br/>[FR] PROCÉDÉS ET INTERMÉDIAIRES DE SYNTHÈSE DE DÉRIVÉS D'ACIDES BÊTA-AMINÉS N-ACYLÉS-4-ARYLE
申请人:CHIRAL QUEST INC
公开号:WO2010078440A1
公开(公告)日:2010-07-08
A process for producing an enantiomerically enriched, pure or enriched and essentially pure compound of Formula I [structure] wherein the R-, or S-configuration at the stereogenic center is marked with an *, which process hydrogenates an enamide compound of formula III [structure] in an organic solvent in the presence of a transition metal precursor complexed to a chiral phosphine ligand catalyst, wherein Ar is phenyl which is unsubstituted or substituted, R1 and R2 are selected from H, Cl - 8 alkyl, C5 - 12 cycloalkyl, aryl and aryl-C 1 - 2-alkyl, or R1 and R2 together with the nitrogen atom to which they are attached form a C4- r member heterocyclic πng system optionally fused with a 5- to 6- member carbocyclic or heterocyclic ring system, and the other substituents are as defined herein.
METHOD FOR PREPARING SITAGLIPTIN INTERMEDIATE VIA ASYMMETRICAL REDUCTION METHOD
申请人:ZHEJIANG HUAHAI PHARMACEUTICAL CO., LTD.
公开号:US20170305822A1
公开(公告)日:2017-10-26
Disclosed is a method for synthesizing a sitagliptin intermediate, the method comprising: in the presence of hydrogen and a transition metal catalyst having a chiral phosphine ligand, subjecting a compound of formula II to an asymmetric reductive amination with ammonia or ammonium salt in a proper organic solvent under the condition of adding an acidic additive to produce a compound of formula I, wherein, an R- or S-configuration of a stereocenter is represented by *; the compound of formula I of R configuration can be used to prepare sitagliptin, and a reaction formula is as follows: R
1
and R
2
are each independently selected from hydrogen, C
1
-C
12
linear or branched alkyl, C
3
-C
12
cycloalkyl, C
2
-C
12
alkenyl, C
2
-C
12
alkynyl and C
7
-C
12
arylalkyl. The method has a high yield and a high ee % value, a mild reaction condition and a low production cost, and is simple to operate, convenient to purify, environmental friendly and suitable for industrial production.
PROCESS AND INTERMEDIATES FOR THE PREPARATION OF N-ACYLATED-4-ARYL BETA-AMINO ACID DERIVATIVES
申请人:Wu Shulin
公开号:US20100280245A1
公开(公告)日:2010-11-04
A process for producing an enantiomerically enriched, pure or enriched and essentially pure compound of Formula I:
wherein the R-, or S-configuration at the stereogenic center is marked with an *; which process hydrogenates an enamide compound of formula III:
in an organic solvent in the presence of a transition metal precursor complexed to a chiral phosphine ligand catalyst;
wherein Ar is phenyl which is unsubstituted or substituted;
Z is OR
1
, SR
1
and NR
1
R
2
; and P is R
3
, OR
3
, and NR
3
R
4
;
R
1
and R
2
are selected from H, C
1-8
alkyl, C
5-12
cycloalkyl, aryl and aryl-C
1-2
-alkyl; or R
1
and R
2
together with the nitrogen atom to which they are attached form a C
4-7
-member heterocyclic ring system optionally fused with a 5- to 6-member carbocyclic or heterocyclic ring system; and
R
3
and R
4
are selected from H, C
1-8
alkyl, aryl, C
5-12
cycloalkyl and aryl-C
1-2
-alkyl; or R
3
and R
4
together with the nitrogen atom to which they are attached form a C
4-7
-member heterocyclic ring system.