.alpha.2-Adrenergic agonists/antagonists: the synthesis and structure-activity relationships of a series of indolin-2-yl and tetrahydroquinolin-2-yl imidazolines
摘要:
The synthesis and alpha 2-adrenergic activity of a series of indolin-2-yl and tetrahydroquinolin-2-yl imidazolines are described. The indolin-2-yl imidazoline 4b was found to possess potent alpha 2-adrenergic agonist and antagonist activity. The modification of the substituents on the indoline ring of 4b has led to the separation of these activities. Substitution on the aromatic ring of 4b with halogen or increasing the size of the N-alkyl substituent of 4b gave alpha 2-adrenergic antagonists without agonist activity. The N-allylindoline 4d is more potent than idazoxan in vitro and is equipotent in vivo, but is less receptor selective (alpha 2 vs. alpha 1) than idazoxan. The cis-1,3-dimethylindolin-2-yl imidazoline 6a is an alpha 2-adrenergic agonist equal in potency to clonidine in vitro, while the trans-1,3-dimethylindolin-2-yl imidazoline 6b is a moderately potent alpha 2-adrenergic antagonist.
Abnormal Fischer indolization and its related compounds. XXII. Fischer indolization of ethyl pyruvate 2-(2-chloro- and 2,6-dichlorophenyl)methylhydrazones.
Synthesis of Pyridazino[4,5‐b]indoles by [3+3] Annulation of 2‐Alkenylindoles and Hydrazonyl Chlorides
作者:Shuting Zhang、Xinyu Zhang、Lesong Li、Zhenyu Shi、Yang Wang
DOI:10.1002/chem.202400278
日期:2024.5.8
A environmentally benign and efficient method for the synthesis of pyridazino[4,5-b]indoles has been developed via a novel [3+3] annulationreaction of 2-alkenylindoles and hydrazonyl chlorides. This reaction proceeded smoothly in the presence of base with excellent yield and a broad substrate scope.
通过2-烯基吲哚和腙氯的新型[3+3]环化反应,开发了一种环境友好且高效的哒嗪并[4,5- b ]吲哚合成方法。该反应在碱存在下顺利进行,产率优异,底物范围广泛。
ISHII, HISASHI;MURAKAMI, YASUOKI;ISHIKAWA, TSUTOMU, CHEM. AND PHARM. BULL. , 38,(1990) N, C. 597-604