Asymmetric Pnictogen-Bonding Catalysis: Transfer Hydrogenation by a Chiral Antimony(V) Cation/Anion Pair
作者:Jian Zhang、Jun Wei、Wei-Yi Ding、Shaoyu Li、Shao-Hua Xiang、Bin Tan
DOI:10.1021/jacs.1c02808
日期:2021.5.5
Pnictogen-bonding catalysisbased on σ-hole interactions has recently attracted the attention of synthetic chemists. As a proof-of-concept for asymmetric pnictogen-bonding catalysis, we report herein an enantioselective transfer hydrogenation of benzoxazines catalyzed by a novel chiral antimony cation/anion pair. The chiral pnictogen catalyst library could be rapidly accessed from triarylstibine with
RETINOIC ACID RECEPTOR ANTAGONISTS AS CHAPERONE-MEDIATED AUTOPHAGY MODULATORS AND USES THEREOF
申请人:ALBERT EINSTEIN COLLEGE OF MEDICINE OF YESHIVA UNIVERSITY
公开号:US20150166492A1
公开(公告)日:2015-06-18
Compounds, compositions and methods are provided for selectively activating chaperone-mediated autophagy (CMA), protecting cells from oxidative stress, proteotoxicity and lipotoxicity, and/or antagonizing activity of retinoic acid receptor alpha (RARα) in subjects in need thereof.
[EN] MITOCHONDRIAL INHIBITORS TO TREAT HUMAN DISEASE<br/>[FR] INHIBITEURS MITOCHONDRIAUX PERMETTANT DE TRAITER UNE MALADIE HUMAINE
申请人:EINSTEIN COLL MED
公开号:WO2010120337A1
公开(公告)日:2010-10-21
The present invention relates to inhibitors of mitochondria-associated, granulocyte- macrophage colony stimulating factor signaling molecule (Magmas), and related compositions and uses thereof.
Biocatalytic asymmetric Mannich reaction of ketimines using wheat germ lipase
作者:Ling-Ling Wu、Yang Xiang、Da-Cheng Yang、Zhi Guan、Yan-Hong He
DOI:10.1039/c5cy01923k
日期:——
highly enantioselective Mannichreaction between 3-substituted-2H-1,4-benzoxazines and acetone catalyzed by lipase from wheat germ type I (WGL) is described. Enantioselectivity of up to 95% ee was achieved in DMSO at 25 °C. This research provides a new and simple method for the synthesis of β-amino ketone derivatives and promotes the development of enzyme-catalyzed Mannichreactions.
描述了由I型小麦胚芽(WGL)的脂肪酶催化的3-取代-2 H -1,4-苯并恶嗪与丙酮之间的高度对映选择性曼尼希反应。在25°C的DMSO中,对映体选择性高达95%ee。该研究为合成β-氨基酮衍生物提供了一种新的简便方法,并促进了酶催化曼尼希反应的发展。
Direct Organocatalytic Asymmetric Mannich Addition of 3-Substituted-2<i>H</i>-1,4-Benzoxazines: Access to Tetrasubstituted Carbon Stereocenters
Abstract3‐Substituted‐2H‐1,4‐benzoxazines undergo a highly enantioselective direct Mannich reaction with acetone in the presence of an L‐proline catalyst at room temperature. The corresponding N‐heterocycles with α‐tetrasubstituted carbon stereocenters were obtained in good yields (48–92%) and excellent enantioselectivity (up to >99% ee). Furthermore, a novel modification involving the diastereoselective reduction of the Mannich adduct was carried out leading to the formation of a 1,3‐amino alcohol with a chiral tetrasubstituted carbon stereocenter in high yield.magnified image