Discovery of Potent, Nonsystemic Apical Sodium-Codependent Bile Acid Transporter Inhibitors (Part 1)
摘要:
Elevated plasma levels of low-density lipoprotein (LDL) cholesterol are a major risk factor for atherosclerosis leading to coronary artery disease (CAD), which remains the main cause of mortality in Western society. We believe that by preventing the reabsorption of bile acids, a minimally absorbed apical sodium-codependent bile acid transporter (ASBT) inhibitor would lower the serum cholesterol without the potential systemic side effects of an absorbed drug. A series of novel benzothiepines (3R,3R'-2,3,4,5-tetrahydro-5-aryl-l-benzothiepin-4-ol 1,1-dioxides) were synthesized and tested for their ability to inhibit the apical sodium dependent bile acid transport (ASBT)-mediated uptake of [C-14]taurocholate (TC) in H14 cells. A 3R,4.R,5R13S,4S,5S racemate was found to have greater potency than the other three possible racemates. Addition of electron-donating groups such as a dimethylamino substituent at the 7 position greatly enhanced potency, and incorporation of a long-chain quaternary ammonium substituent on the 5-phenyl ring was useful in minimizing systemic exposure of this locally active ASBT inhibitor while also increasing water solubility and maintaining potency. The reported results describe the synthesis and SAR development of this benzothiepine class of ASBT inhibitors resulting in an 6000-fold improvement in ASBT inhibition with desired minimal systemic exposure of this locally acting drug candidate.
Synthesis, computer modeling and biological evaluation of novel protein kinase C agonists based on a 7-membered lactam moiety
摘要:
4-Hydroxymethyl-5a-methyl-1,3,4,5,5a beta,6,7,8,9,9a alpha-decahydro-2H-benz[d]azepin-2-one (4-12), which were designed to mimic the biologically active conformation of teleocidins and benzolactams, were synthesized and evaluated for the ability to compete with [H-3]phorbol 12,13-dibutyrate in a PKC delta binding assay. Among the ed potent binding affinity, with inhibition constants (K-i) of low nanomolar order. Computational docking simulation also indicates that the relative positions of the hydrogen-bonding sites and hydrophobic regions of the compounds are well matched to the PKC delta binding site. (C) 1999 Elsevier Science Ltd. All rights reserved.
Enamines from Terminal Epoxides and Hindered Lithium Amides
作者:David M. Hodgson、Christopher D. Bray、Nicholas D. Kindon
DOI:10.1021/ja031770o
日期:2004.6.1
A new reactivity mode of lithium amides with epoxides leads to hindered enamines. The reaction of some of these enamines with unactivated primary and secondary alkyl halides is described, which expands the range of electrophiles that one can use in the synthesis of mono-alkylated aldehydes.
Ligand‐Controlled Direct γ‐C−H Arylation of Aldehydes
作者:Bijin Li、Brianna Lawrence、Guigen Li、Haibo Ge
DOI:10.1002/anie.201913126
日期:2020.2.17
The first example of PdII -catalyzed γ-C(sp3 )-H functionalization of aliphatic and benzoheteroaryl aldehydes has been developed using a transient ligand and an external ligand, concurrently. A wide array of γ-arylated aldehydes were readily accessed without preinstalling internal directing groups. The catalytic mechanism was studied by performing deuterium-labelling experiments, which indicated that
Catalyst Repurposing Sequential Catalysis by Harnessing Regenerated Prolinamide Organocatalysts as Transfer Hydrogenation Ligands
作者:Frederic Bourgeois、Jonathan A. Medlock、Werner Bonrath、Christof Sparr
DOI:10.1021/acs.orglett.9b04033
日期:2020.1.3
A catalyst repurposing strategy based on a sequential aldol addition and transferhydrogenation giving access to enantiomerically enriched α-hydroxy-γ-butyrolactones is described. The combination of a stereoselective, organocatalytic step, followed by an efficient catalytic aldehydereduction induces an ensuing lactonization to provide enantioenriched butyrolactones from readily available starting
Synthesis and <i>C</i>-Alkylation of Hindered Aldehyde Enamines
作者:David M. Hodgson、Christopher D. Bray、Nicholas D. Kindon、Nigel J. Reynolds、Steven J. Coote、Joann M. Um、K. N. Houk
DOI:10.1021/jo802016t
日期:2009.2.6
hindered lithium amides with terminal epoxides is described whereby aldehydeenamines are produced via a previously unrecognized reaction pathway. Some of these aldehydeenamines display unprecedented C-alkylation reactivity toward unactivated primary and secondary alkyl halides. For comparison, the reactivity of aldehydeenamines synthesized via a traditional condensation method was examined. C- rather
GLYCERYL ASCORBIC ACID ACYLATED DERIVATIVE OR ITS SALT, PRODUCTION METHOD THEREOF, AND COSMETICS
申请人:YOSHIOKA Masato
公开号:US20130204017A1
公开(公告)日:2013-08-08
A glyceryl ascorbic acid acylated derivative or its salt, which has an ascorbic acid structure where 2- and/or 3-positions of the structure are substituted with glyceryl groups and some of the hydroxyl groups in the structure and/or in the glyceryl group are acylated, a production method of the glyceryl ascorbic acid acylated derivative and a cosmetic containing the glyceryl ascorbic acid acylated derivative or its salt are provided.