Discovery of (3S,3aR)-2-(3-Chloro-4-cyanophenyl)-3-cyclopentyl-3,3a,4,5-tetrahydro-2H-benzo[g]indazole-7-carboxylic Acid (PF-3882845), an Orally Efficacious Mineralocorticoid Receptor (MR) Antagonist for Hypertension and Nephropathy
摘要:
We have discovered a novel class of nonsteroidal pyrazoline antagonists of the mineralocorticoid receptor (M R) that show excellent potency and selectivity against other nuclear receptors. Early analogues were poorly soluble and had a propensity to inhibit the hERG channel. Remarkably, both of these challenges were overcome by incorporation of a single carboxylate moiety. Structural modification of carboxylate-containing lead R-4g with a wide range of substituents at each position of the pyrazoline ring resulted in R-12o, which shows excellent activity against MR and reasonable pharmacokinetic profile. Introduction of conformational restriction led to a novel series characterized by exquisite potency and favorable steroid receptor selectivity and pharmacokinetic profile. Oral dosing of 3S,3aR-27d (PF-3882845) in the Dahl salt sensitive preclinical model of salt-induced hypertension and nephropathy showed blood pressure attenuation significantly greater than that with eplerenone, reduction in urinary albumin, and renal protection. As a result of these findings, 3S,3aR-27d was advanced to clinical studies.
A SO2F2 mediated mild, practical, and gram-scale dehydroxylative transforming primary alcohols to quaternary ammonium salts
作者:Chuang Zhao、Gao-Feng Zha、Wan-Yin Fang、Njud S. Alharbi、Hua-Li Qin
DOI:10.1016/j.tet.2019.07.007
日期:2019.8
A simple, practical and gram-scale process for direct transformation of primary alcohols or silyl ethers to ammonium salts was developed. This method has the feathers of easy work-up (a simple filtration), mild condition, high yield, great practicality and robustness. And the application of the ammonium salts in Suzuki coupling reaction was also accomplished.
potential of oxide-supported single-atom metal catalysts (SACs) is key to successfully bridge the gap between the fields of homogeneous and heterogeneous catalysis. Here we show that the one-pot combination of Ru1 /CeO2 and Rh1 /CeO2 SACs enables a highly selective olefin isomerization-hydrosilylation tandem process, hitherto restricted to molecular catalysts in solution. Individually, monoatomic Ru and
Sustainable Catalytic Synthesis of Diethyl Carbonate
作者:Wahyu S. Putro、Akira Ikeda、Shinji Shigeyasu、Satoshi Hamura、Seiji Matsumoto、Vladimir Ya. Lee、Jun‐Chul Choi、Norihisa Fukaya
DOI:10.1002/cssc.202002471
日期:2021.2.5
New sustainable approaches should be developed to overcome equilibrium limitation of dialkyl carbonate synthesis from CO2 and alcohols. Using tetraethyl orthosilicate (TEOS) and CO2 with Zr catalysts, we report the first example of sustainable catalytic synthesis of diethyl carbonate (DEC). The disiloxane byproduct can be reverted to TEOS. Under the same conditions, DEC can be synthesized using a wide
Highly Selective Dehydrogenative Silylation of Alkenes Catalyzed by Rhenium Complexes
作者:Yanfeng Jiang、Olivier Blacque、Thomas Fox、Christian M. Frech、Heinz Berke
DOI:10.1002/chem.200802019
日期:2009.2.16
chemicals: Rhenium(I) complexes of type [ReBr2(L)(NO)(PR3)2] (L=H2 (1), CH3CN (2), ethylene (3); R=iPr (a), cyclohexyl (b)) proved to be suitable catalyst precursors for the highlyselectivedehydrogenativesilylation of alkenes. Two types of rhenium(I) hydride species, [ReBrH(NO)(PR3)2] (4) and [ReBr(η2‐CH2CHR1)H(NO)(PR3)2] (5), were found in the [ReBr2(L)(NO)(PR3)2]‐catalyzeddehydrogenative silylation
选择化学药品:[ReBr 2(L)(NO)(PR 3)2 ]类型的R(I)配合物(L = H 2(1),CH 3 CN(2),乙烯(3); R = i Pr (a),环己基(b))被证明是用于烯烃的高度选择性脱氢甲硅烷基化的合适催化剂前体。两种类型的铼(I)氢化物种,[ReBrH(NO)(PR 3)2 ](4)和[ReBr(η 2 -CH 2 CHR 1)H(NO)(PR 3)2 ](5),是在[ReBr 2(L)(NO)(PR 3)2 ]催化的烯烃脱氢甲硅烷基化反应中发现的。
Method of preparing an organosilicon compound
申请人:Dow Corning Asia, Ltd.
公开号:US06326506B1
公开(公告)日:2001-12-04
A method of preparing an organosilicon compound comprising effecting a hydrosilylation reaction between (a) unsaturated compounds with terminal unsaturated groups and (b) silane compounds described by formula HSiR0mW3−m, where W is selected from the group consisting of C1 to C6 alkoxy groups, C6 to C10 aryloxy groups, and halogen atoms, R0 is an organic group, and m is 0, 1, or 2 in the presence of (c) a platinum catalyst and (d) an auxiliary catalyst selected from the group consisting of (1) silyl esters of acids derived from oxo acids of sulfur; (2) amide compounds having N—Si bonds; (3) urea compounds; (4) silyl esters of carbamic acid; (5) phosphoric acid compounds; and (6) cyclic compounds selected from the group consisting of (i) hydroxypyridine compounds, (ii) 8-hydroxyquinoline compounds, (iii) oxazolidinone compounds, and (iv) N-hydroxysuccinimide compounds.