Cascade regioselective synthesis of pyrazoles from nitroallylic acetates and N-tosyl hydrazine
摘要:
A simple, practical, and regioselective synthetic protocol for the formation of pyrazoles was developed. Unlike all other previously reported reactions of nitroallylic acetates, this process was initiated by a S(N)2 reaction at the electrophilic gamma site. A plausible mechanism for the cascade S(N)2-Michael synthesis is proposed. (C) 2013 Elsevier Ltd. All rights reserved.
From a Designer Drug to the Discovery of Selective Cannabinoid Type 2 Receptor Agonists with Favorable Pharmacokinetic Profiles for the Treatment of Systemic Sclerosis
discover novel and selective CB2 receptor agonists, 1 was selected as a starting point for hit molecule identification and a class of 1H-pyrazole-3-carboxamide derivatives were thus designed, synthesized, and biologically evaluated. Systematic structure–activity relationship investigations resulted in the identification of the most promising compound 66 as a selective CB2 receptor agonist with favorable pharmacokinetic
New pyrazole derivatives as CRAC channel modulators
申请人:Almirall, S.A.
公开号:EP2848615A1
公开(公告)日:2015-03-18
The present invention relates to compounds of formula (I) which are inhibitors of CRAC channel activity. This invention also relates to pharmaceutical compositions containing them, process for their preparation and their use in therapy.
Cascade regioselective synthesis of pyrazoles from nitroallylic acetates and N-tosyl hydrazine
作者:Nana Shao、Tong Chen、Taotao Zhang、Huajian Zhu、Qunxiong Zheng、Hongbin Zou
DOI:10.1016/j.tet.2013.12.046
日期:2014.1
A simple, practical, and regioselective synthetic protocol for the formation of pyrazoles was developed. Unlike all other previously reported reactions of nitroallylic acetates, this process was initiated by a S(N)2 reaction at the electrophilic gamma site. A plausible mechanism for the cascade S(N)2-Michael synthesis is proposed. (C) 2013 Elsevier Ltd. All rights reserved.
Lead Optimization of the 5-Phenylpyrazolopyrimidinone NPD-2975 toward Compounds with Improved Antitrypanosomal Efficacy
作者:Yang Zheng、Magali van den Kerkhof、Mohamed Ibrahim、Iwan J. P. De Esch、Louis Maes、Geert Jan Sterk、Guy Caljon、Rob Leurs
DOI:10.1021/acs.jmedchem.3c01976
日期:2024.2.22
emerging drug resistance, stressing an urgency for novel antitrypanosomal drug discovery. Here, we describe leadoptimization efforts aiming at improvingantitrypanosomalefficacy and better physicochemical properties based on our previously reported optimized hit NPD-2975 (pIC50 7.2). Systematic modification of the 5-phenylpyrazolopyrimidinoneNPD-2975 led to the discovery of a R4-substituted analogue 31c