Discovery and Evaluation of a Series of 3-Acylindole Imidazopyridine Platelet-Activating Factor Antagonists
摘要:
Studies conducted with the goal of discovering a second-generation platelet-activating factor (PAF) antagonist have identified a novel class of potent and orally active antagonists which have high aqueous solubility and long duration of action in animal models. The compounds arose from the combination of the lipophilic indole portion of Abbott's first-generation PAF antagonist ABT-299 (2) with the methylimidazopyridine heterocycle moiety of British Biotechnology's BB-882 (1) and possess the positive attributes of both of these clinical candidates. Structure-activity relationship (SAR) studies indicated that modification of the indole and benzoyl spacer of lead compound 7b gave analogues that were more potent, longer-lived, and bioavailable and resulted in the identification of 1-(N,N-dimethylcarbamoyl)-4-ethynyl-3-(3-fluoro-4-[(1H-2-methylimidazo[4,5-c]pyrid-1-yl)methyl] benzoyl}indole hydrochloride (ABT-491, 22m.HCl) which has been evaluated extensively and is currently in clinical development.
本发明提供了式子##STR1##中的化合物,其中Y为> C = O或> S(O).sub.t,其中t为1或2,以及其药学上可接受的盐,这些化合物是PAF的有效拮抗剂,可用于治疗与PAF相关的疾病,包括哮喘,鼻炎,休克,呼吸窘迫综合征,急性炎症,移植器官排斥,胃肠溃疡,过敏性皮肤病,迟发性细胞免疫,分娩,胎肺成熟和细胞分化。
Pd(II)-Catalyzed C4-Selective Alkynylation of Indoles by a Transient Directing Group
作者:Ze-Xuan Zhang、Bing Zhang、Meng Yuan、Peng-Fei Zhao、Chao-Shan Da
DOI:10.1021/acs.orglett.4c01970
日期:2024.8.16
With alanine as a transient directing group, Pd-catalyzed regioselective alkynylation at the indole C4-position was successfully established in a good yield. The total synthesis of the PAF antagonist demonstrated the synthetic utility of this protocol. The regioselectivity was explicitly proven by the prepared C4-selective palladacycle intermediate in the catalytic process and the DFT calculation of