Iodine-catalyzed Csp3-H functionalization of methylhetarenes: One-pot synthesis and cytotoxic evaluation of heteroarenyl-benzimidazoles and benzothiazole
摘要:
An efficient one-pot synthetic procedure has been developed for the preparation of heteroarenyl-benzim-dazoles via oxidative C-sp3-H functionalization with o-phenylenediamine using I-2-DMSO in open air from easily available starting materials. Based on a logical plan a spectrum of multi fundamental reactions like iodination, Kornblum oxidation and amination were brought into one-pot. By using this simple method a library of heteroarenyl-benzimidazoles derivatives (3a-t and 5a-g) and heteroarenyl-benzothiazole (3u) have been synthesized in good to excellent yield and screened for their cytotoxicity against a group of four human cancer cell lines. Among them 3h, 3q and 5b showed significant cytotoxic activities with an IC50 of 1.69, 1.62 and 2.81 mu M respectively against lung cancer (A549) cell line. (C) 2017 Elsevier Ltd. All rights reserved.
Catalytic Aerobic Photo‐oxidation of a Methyl Group on a Heterocycle to Produce an Aldehyde
<i>via</i>
Homolytic CI Bond Cleavage caused by Irradiation with Visible Light
A new catalytic method was developed for photo‐oxidizing the methyl group on aromatic heterocycles such as benzothiazole, benzoxazole, and quinoline to produce the corresponding aldehyde. This is the first report of the metal‐free catalytic synthesis of benzothiazole‐2‐carboxaldehydes using molecular oxygen as the terminal oxidant.
IMIDAZO (4,5-c) PYRIDINES WITH PAF ANTAGONIST ACTIVITY
申请人:PFIZER INC.
公开号:EP0533695B1
公开(公告)日:1994-10-05
US5322847A
申请人:——
公开号:US5322847A
公开(公告)日:1994-06-21
[EN] IMIDAZO (4,5-c) PYRIDINES WITH PAF ANTAGONIST ACTIVITY
申请人:PFIZER INC.
公开号:WO1991017163A1
公开(公告)日:1991-11-14
(EN) A series of imidazo(4,5-c)pyridines of formula (I) which inhibit platelet activating factor (PAF) and also block leukotriene D4 receptors are useful in treating asthma, arthritis, psoriasis, gastrointestinal distress, myocardial infarction, stroke and shock.(FR) Une série d'imidazo(4,5-c)pyridines de formule (I), inhibant le facteur d'activation plaquettaire (FAP) et bloquant également les récepteurs de leucotriènes D4 sont utiles dans le traitement de l'asthme, de l'arthrite, du psoriasis, des troubles gastro-intestinaux, de l'infarctus du myocarde, des attaques et des chocs.