Novel process for the synthesis of class I antiarrhythmic agent (+/-)-cibenzoline and its analogs
Title | Novel process for the synthesis of class I antiarrhythmic agent (+/-)-cibenzoline and its analogs |
Publication Type | Journal Article |
Year of Publication | 2008 |
Authors | Gholap, AR, Paul, V, Srinivasan, KV |
Journal | Synthetic Communications |
Volume | 38 |
Issue | 17 |
Pagination | 2967-2982 |
Date Published | AUG |
ISSN | 0039-7911 |
Keywords | Benzophenone, cibenzoline, cyclopropanation, diaryl cyanoolefin |
Abstract | Synthesis of (+/-)-cibenzoline and its analogs has been achieved by a simple sequence of reactions. The diaryl cyanoolefin intermediate 3 could be prepared by Knoevenagel condensation of benzophenone with ethylcyanoacetate to form the tetra-substituted olefin intermediate 2 followed by Krapcho deethoxycarbonylation or from beta-hydroxynitrile intermediate 2' followed by the elimination of hydroxyl group respectively. The 2,2-diphenylcyclopropanecarbonitrile 4 was synthesized from intermediate 3 by cyclopropanation, which was converted to (+/-)-2-(2,2-diphenylcyclopropyl)-2-imidazoline 5 by reaction with ethylenediamine in the presence of a catalytic amount of sulfur. Moreover, the obtained 2-imidazolines were smoothly oxidized to the corresponding imidazoles 6 in good to moderate yields. |
DOI | 10.1080/00397910802006388 |
Type of Journal (Indian or Foreign) | Foreign |
Impact Factor (IF) | 0.937 |