Organocatalytic Modified Guareschi–Thorpe Type Regioselective Synthesis: A Unified Direct Access to 5,6,7,8-Tetrahydroquinolines and Other Alicyclic[<i>b</i>]-Fused Pyridines
作者:Pradeep K. Jaiswal、Vashundhra Sharma、Manas Mathur、Sandeep Chaudhary
DOI:10.1021/acs.orglett.8b02132
日期:2018.10.5
An unprecedented organocatalytic, regioselective, modified Guareschi–Thorpe type protocol toward the modular synthesis of 5,6,7,8-tetrahydroquinolines 22a–g and other alicyclic[b]-fused pyridines 23–28 via the identification of Chitosan as a heterogeneous catalyst is reported. This novel strategy is operationally simple and showed a wide range of functional group tolerance and substrate compatibility
前所未有的有机催化,区域选择性,改良的Guareschi-Thorpe型方案,通过鉴定壳聚糖作为多相催化剂,可模块化合成5,6,7,8-四氢喹啉22a – g和其他脂环式[ b ]稠合吡啶23 – 28。被报道。这种新颖的策略操作简单,并且具有广泛的官能团耐受性和底物相容性。拟议的机制途径涉及亚胺-烯胺级联方法,用于合成结构多样的脂环式[ b ]稠合吡啶杂环。新型抗真菌分子的克级合成和鉴定29 –图31强调了这种方法的实用性。
Synthesis of Methyl 4-Aryl-4-oxo-2-{4-[(1,3-thiazol-2-yl)-sulfamoyl]phenylamino}but-2-enoates and Their Reactions with Ninhydrin
作者:V. L. Gein、O. V. Bobrovskaya、A. A. Russkikh、M. V. Dmitriev、A. N. Yankin
DOI:10.1134/s107042801905004x
日期:2019.5
The reaction of methyl aroylpyruvates with 2-(4-aminobenzenesulfonamido)thiazole (norsulfazole) in acetic acid-ethanol (1: 1) afforded methyl (2Z)-4-aryl-4-oxo-2-4-[(1,3-thiazol-2-yl)sulfamoyl]phenyl-amino} but-2-enoates which reacted with ninhydrin in glacial acetic acid to give 4-aroyl-3-4-[(1,3-thiazol-2-yl)-sulfamoyl]phenylamino} spiro[2,5-dihydrofuran-5,2′-indane]-2,1′,3′-triones.
Tissue-nonspecific alkaline phosphatase (TNAP) plays a central role in regulating extracellular matrix calcification during bone formation and growth. High-throughput screening (HTS) for small molecule TNAP inhibitors led to the identification of hits in the sub-micromolar potency range. We report the design, synthesis and in vitro evaluation of a series of pyrazole derivatives of a screening hit which are potent TNAP inhibitors exhibiting IC50 values as low as 5 nM. A representative of the series was characterized in kinetic studies and determined to have a mode of inhibition not previously observed for TNAP inhibitors. Published by Elsevier Ltd.
Non-peptide-based new class of platelet aggregation inhibitors: Design, synthesis, bioevaluation, SAR, and<i>in silico</i>studies
作者:Pradeep K. Jaiswal、Vashundhra Sharma、Surendra Kumar、Manas Mathur、Ajit K. Swami、Dharmendra K. Yadav、Sandeep Chaudhary
DOI:10.1002/ardp.201700349
日期:2018.4
A series of 2‐oxo‐2‐phenylethylidene linked 2‐oxo‐benzo[1,4]oxazine analogues 17a–x and 18a–o, incorporated with a variety of electron‐withdrawing as well as electron‐donating groups at ring A and ring C, were synthesized under greener conditions in excellent yields (up to 98%). These analogues 17a–x and 18a–o were evaluated for their arachidonic acid (AA)‐induced platelet aggregation inhibitory activities