Bifunctional Catalysis: Direct Reductive Amination of Aliphatic Ketones with an Iridium-Phosphate Catalyst
作者:Barbara Villa-Marcos、Chaoqun Li、Keith R. Mulholland、Philip J. Hogan、Jianliang Xiao
DOI:10.3390/molecules15042453
日期:——
pathway to these amines is directasymmetric reductive amination (DARA) of prochiral ketones. This paper shows that a wide range of aliphatic ketones can be directly aminated under hydrogenation conditions, affording chiral amines with good to excellent yields and with enantioselectivities up to 96% ee. The catalysis is effected by the cooperative action of a cationic Cp*Ir(III) complex and its phosphate
手性胺是精细化工、医药和农化产品中普遍存在的官能团之一,这些胺最方便、经济和生态友好的合成途径是前手性酮的直接不对称还原胺化(DARA)。这篇论文表明,在氢化条件下可以直接胺化范围广泛的脂肪族酮,从而提供具有良好到极好的产率和高达 96% ee 的对映选择性的手性胺。催化作用受阳离子 Cp*Ir(III) 络合物及其磷酸盐反阴离子的协同作用的影响。
Cooperative Catalysis: Combining an Achiral Metal Catalyst with a Chiral Brønsted Acid Enables Highly Enantioselective Hydrogenation of Imines
作者:Weijun Tang、Steven Johnston、Chaoqun Li、Jonathan A. Iggo、John Bacsa、Jianliang Xiao
DOI:10.1002/chem.201302437
日期:2013.10.11
Asymmetric hydrogenation of imines leads directly to chiral amines, one of the most important structural units in chemical products, from pharmaceuticals to materials. However, highly effective catalysts are rare. This article reveals that combining an achiral pentamethylcyclopentadienyl (Cp*)–iridium complex with a chiral phosphoric acid affords a catalyst that allows for highly enantioselective hydrogenation
Catalytically active iridacycles are formed by cyclometalation of acetophenone imines with Ir–PHOX complexes under hydrogen atmosphere. These complexes show unusually high reactivity and enantioselectivity in the hydrogenation of alkyl methyl ketimines. The structure of the cyclometalated imine has a strong effect on the conversion and enantiomeric excess.
Gonadotropin-releasing hormone receptor antagonists and methods relating thereto
申请人:Zhu Yun-Fei
公开号:US20070208049A1
公开(公告)日:2007-09-06
GnRH receptor antagonists are disclosed that have utility in the treatment of a variety of sex-hormone related conditions in both men and women. The compounds of this invention have the structure:
wherein A, Q, R
1
, R
2
, R
3a
, R
3b
, R
4
, R
5
, R
6
and n are as defined herein, including stereoisomers, prodrugs and pharmaceutically acceptable salts thereof. Also disclosed are compositions containing a compound of this invention in combination with a pharmaceutically acceptable carrier, as well as methods relating to the use thereof for antagonizing gonadotropin-releasing hormone in a subject in need thereof.