Highly Enantioselective Pd-Catalyzed Asymmetric Hydrogenation of Activated Imines
作者:You-Qing Wang、Sheng-Mei Lu、Yong-Gui Zhou
DOI:10.1021/jo0700878
日期:2007.5.1
complexes are highly effective catalysts for asymmetrichydrogenation of activated imines in trifluoroethanol. The asymmetrichydrogenation of N-diphenylphosphinyl ketimines 3 with Pd(CF3CO2)/(S)-SegPhos indicated 87−99% ee, and N-tosylimines 5 could gave 88−97% ee with Pd(CF3CO2)/(S)-SynPhos as a catalyst. CyclicN-sulfonylimines 7 and 11 were hydrogenated to afford the useful chiral sultam derivatives in
Pd /双膦配合物是用于活化的亚胺在三氟乙醇中不对称氢化的高效催化剂。Pd(CF 3 CO 2)/(S)-SegPhos对N-二苯基亚膦酰基酮亚胺3的不对称氢化表明ee为87-99%,N- tosylimines 5与Pd(CF 3 CO 2)可以得到88-97%ee /(S)-SynPhos作为催化剂。环状N-磺酰亚胺7和11 进行氢化,以79-93%ee的比重得到有用的手性舒马坦衍生物,这是重要的有机合成中间体和农业和医药制剂的结构单元。
Transfer hydrogenation process
申请人:Avecia Limited
公开号:US06696608B1
公开(公告)日:2004-02-24
A catalytic transfer hydrogenation process is provided. The process can be employed to transfer hydrogenate N-substituted imines and iminium salts, which are preferably prochiral. The catalyst employed in the process is preferably a metal complex with one hydrocarbyl or cyclopentadienyl ligand and which is also coordinated to defined bidentate ligands. Preferred metals include rhodium, ruthenium and iridium. Preferred bidentate ligands are diamines and aminoalcohols, particularly those comprising chiral centres. The hydrogen donor is advantageously a mixture of triethylamine and formic acid. A process for the production of primary and secondary amines using the catalytic transfer hydrogenation of the N-substituted imines and iminium salts is also provided.
Aza-Henry reaction of ketimines catalyzed by guanidine and phosphazene bases
作者:Nirmal K. Pahadi、Hitoshi Ube、Masahiro Terada
DOI:10.1016/j.tetlet.2007.10.016
日期:2007.12
aza-Henry product in good yield with moderate diastereoselectivity (3:1). Thus, the methodology developed here is a good template for developing the first organocatalytic approach towards the aza-Henry reaction of ketimines.
[EN] ENZYMATIC PROCESS FOR THE FOR PREPARATION OF (R)-1-(1-NAPHTHYL) ETHYLAMINE, AN INTERMEDIATE OF CINACALCET HYDROCHLORIDE<br/>[FR] PROCÉDÉ ENZYMATIQUE POUR LA PRÉPARATION DE LA (R)-1-(1-NAPHTYL)ÉTHYLAMINE, UN INTERMÉDIAIRE DU CHLORHYDRATE DE CINACALCET
申请人:LUPIN LTD
公开号:WO2017033134A1
公开(公告)日:2017-03-02
The present invention provides a process for the preparation of enantiomerically pure (R)- 1-(1-naphthyl)ethylamine of formula (IIa) by treating 1-acetylnaphthalene of formula (I) with R-selective transaminase enzyme in presence of amino donor. The (R)-1-(1-naphthyl)ethylamine of formula (IIa) thus obtained is further converted to cinacalcet hydrochloride of formula (III).
Enantioselective Strecker-type reaction of phosphinoyl ketimines catalyzed by a chiral Zr-bipyridyldiol catalyst
作者:Yi-Jing Chen、Chinpiao Chen
DOI:10.1016/j.tetasy.2008.09.011
日期:2008.9
An enantioselective Strecker reaction of N-diphenylphosphinoyl ketimines with TMSCN employing a chiral zirconium complex formed from chiral bipyridyl diol 1 as catalyst is described. The catalytic efficiency of chiral ligand 1 with other Lewis acids was also explored. Higher yields (50-85%) with moderate to good enantioselectivities (30-80%) were achieved for a variety of N-diphenylphosphinoyl ketimines. (C) 2008 Elsevier Ltd. All rights reserved.