Synthesis, structure and antiaggregatory effects of some N-(4,5-dihydro-1H-imidazol-2-yl)indoles
摘要:
A series of 1-(4,5-dihydro-1H-imidazol-2-yl)indole derivatives was prepared in order to evaluate their antiaggregatory activity in human platelets. The compounds 4a-m were prepared by reacting N-aryl-N-(4,5-dihydro-1H-imidazol-2-yl)hydroxylamines (2a-d) with monosubstituted acetylene derivatives 3a-b. Imidazoline derivatives 4 were further acetylated or sulfonylated to give amides 5a-c and sulfonamides 6a-c and 7a-c, respectively. Eight compounds were taken as representative aryliminoimidazoline analogs. Among them only one, 4m, showed a good concentration-dependent action against the primary or alpha(2)-adrenoreceptor mediated phase of noradrenaline-induced aggregation in platelets. (C) 2000 Elsevier Science S.A. All rights reserved.
Synthesis, structure and antiaggregatory effects of some N-(4,5-dihydro-1H-imidazol-2-yl)indoles
摘要:
A series of 1-(4,5-dihydro-1H-imidazol-2-yl)indole derivatives was prepared in order to evaluate their antiaggregatory activity in human platelets. The compounds 4a-m were prepared by reacting N-aryl-N-(4,5-dihydro-1H-imidazol-2-yl)hydroxylamines (2a-d) with monosubstituted acetylene derivatives 3a-b. Imidazoline derivatives 4 were further acetylated or sulfonylated to give amides 5a-c and sulfonamides 6a-c and 7a-c, respectively. Eight compounds were taken as representative aryliminoimidazoline analogs. Among them only one, 4m, showed a good concentration-dependent action against the primary or alpha(2)-adrenoreceptor mediated phase of noradrenaline-induced aggregation in platelets. (C) 2000 Elsevier Science S.A. All rights reserved.
Reactions of <i>N</i>-Aryl-<i>N</i>-(4,5-dihydro-1<i>H</i>-imidazol-2-yl)hydroxylamines with Electron-Deficient Acetylenes. Synthesis and Structure of Novel Heterocyclic Ketene Aminals
Reactions of the title hydroxylamine hydrochlorides 1 with electron-deficient acetylenes 3 are described. Compounds la reacts with ethyl propiolate (3a) to give the expect-ed indole 7, Similar reactions of la-e with disubstituted acetylene derivatives such as diethyl acetylenedicarboxylate (3b), dimethyl acetylenedicarboxylate (3c), or ethyl phenylpropiolate (3d) lead to the formation of novel heterocyclic ketene aminals 9a-m. X-ray crystal structure and NMR spectra of 9a are described in detail.