Asymmetric synthesis of β-aminotetralins by electrophilic amination
摘要:
An effective synthesis of beta-aminotetralins (6) including an asymmetric electrophilic amination by di-t-butyl azodicarboxylate is reported. Depending on the chiral auxiliaries (S)-7a-d, the central intermediates 9 and 10 could be isolated in 62-80% de. Subsequent hydrolysis and reductive degradation resulted in the nonracemic final products 6 (57-84% ee). Separation of the diastereomeric intermediates by chromatography makes possible the synthesis of optically pure products. An induction model for the asymmetric amination is provided.
Discovery of (S)-4-isobutyloxazolidin-2-one as a novel leucyl-tRNA synthetase (LRS)-targeted mTORC1 inhibitor
摘要:
A series of leucinol analogs were investigated as leucyl-tRNA synthetase-targeted mTORC1 inhibitors. Among them, compound 5, (S)-4-isobutyloxazolidin-2-one, showed the most potent inhibition on the mTORC1 pathway in a concentration-dependent manner. Compound 5 inhibited downstream phosphorylation of mTORC1 by blocking leucine-sensing ability of LRS, without affecting the catalytic activity of LRS. In addition, compound 5 exhibited cytotoxicity against rapamycin-resistant colon cancer cells, suggesting that LRS has the potential to serve as a novel therapeutic target. (C) 2016 Elsevier Ltd. All rights reserved.
The present invention relates to compounds of formula (I)
wherein X, R
1
, R
2
, R
3
, R
4
and R
5
are as defined herein, which are useful for treating diseases which respond to CXCR2 receptor mediators. Pharmaceutical compositions that contain the compounds and processes for preparing the compounds are also described.
Certain sulfonamide heterobicyclic platelet activating factor antagonists
申请人:British Bio-Technology Limited
公开号:US05180723A1
公开(公告)日:1993-01-19
Compounds of general formula I; ##STR1## wherein: A.sup.1 is .dbd.N--, .dbd.CH-- or .dbd.CR.sup.1 --; A.sup.2 is .dbd.N--, .dbd.CH-- or .dbd.CR.sup.2 --; provided that, when one of A.sup.1 and A.sup.2 is a nitrogen atom, the other of A.sup.1 and A.sup.2 is other than a nitrogen atom; wherein the other variables are as defined in the specification and their pharmaceutically and veterinarily acceptable acid addition salts and hydrates are antagonists of platelet activating factor (PAF) and as such are useful in the treatment or amelioration of various diseases or disorders mediated by PAF.
P3-P4 ureas and reverse carbamates as potent HCV NS3 protease inhibitors: Effective transposition of the P4 hydrogen bond donor
作者:Brian L. Venables、Ny Sin、Alan Xiangdong Wang、Li-Qiang Sun、Yong Tu、Dennis Hernandez、Amy Sheaffer、Min Lee、Cindy Dunaj、Guangzhi Zhai、Diana Barry、Jacques Friborg、Fei Yu、Jay Knipe、Jason Sandquist、Paul Falk、Dawn Parker、Andrew C. Good、Ramkumar Rajamani、Fiona McPhee、Nicholas A. Meanwell、Paul M. Scola
DOI:10.1016/j.bmcl.2018.04.009
日期:2018.6
A series of tripeptidic acylsulfonamide inhibitors of HCV NS3 protease were prepared that explored structure-activity relationships (SARs) at the P4 position, and their in vitro and in vivo properties were evaluated. Enhanced potency was observed in a series of P4 ureas; however, the PK profiles of these analogues were less than optimal. In an effort to overcome the PK shortcomings, modifications to
A comparison of secondary and tertiary amides as directors of ortho and adjacent benzylic lithiation and of asymmetric induction in ortho lithiated benzamides
Comparisons are made between the influence of secondary and tertiary amides on ortho and adjacent benzylic metallations of benzamides. In the intramolecular competition offered by N,N-diethyl-N-ethylterephthalamide (1) the tertiary amide is the more effective director of ortho lithiation, while the secondary amide is better in the intermolecular competitions offered by the pairs N-ethyl-(9): N,N-diethylbenzamide(10)
Production of certain imidazopyridinyl-methyl-benzene sulfonamides
申请人:British Bio-Technology Limited
公开号:US05276153A1
公开(公告)日:1994-01-04
Compounds of general formula I; ##STR1## wherein: A.sup.1 is .dbd.N--, .dbd.CH-- or .dbd.CR.sup.1 --; A.sup.2 is .dbd.N--, .dbd.CH-- or .dbd.CR.sup.2 --; provided that, when one of A.sup.1 and A.sup.2 is a nitrogen atom, the other of A.sup.1 and A.sup.2 is other than a nitrogen atom; wherein the rest of the variables are defined in the specification; and their pharmaceutically and veterinarily acceptable acid addition salts and hydrates are antagonists of platelet activating factor (PAF) and as such are useful in the treatment or amelioration of various diseases or disorders mediated by PAF.