An Efficient Method for the Preparation of 4-Alkoxy-substituted Thieno[2,3-b]pyridines
摘要:
An efficient method for the preparation of 4-alkoxy-substituted thieno[2,3-b]pyridines is described. The key intermediates, 4-alkoxy-2-chloro-3-cyanopyridines, were synthesized from a variety of alcohols by nucleophilic substitution with 3-cyano-2,4-dichloropyridine or by Mitsunobu reaction with 2-chloro-4-hydroxynicotinonitrile. Subsequent reaction of 4-alkoxy-2-chloro-3-cyanopyridines with 2-(acetylthio)acetamide under basic conditions provided 4-alkoxy-substituted thieno[2,3-b]pyridines in fair to good yields.
Substituted mercapto acid amides are prepared, and are useful as immunoregulants for correcting an imbalance of immune homeostasis, particularly as immunostimulants in the treatment of autoimmune and immune deficient diseases and disorders.
Synthesis and structure-activity relationship of 4-alkoxy-thieno[2,3-b]pyridine derivatives as potent alkaline phosphatase enhancers for osteoporosis treatment
The synthesis and structure-activity relationships of a novel series of 3-aminothieno[2,3-b]pyridine-2-carbox-amides were explored. Our efforts were focused on modifying the C-4 substituent of the thienopyridine ring to develop orally available bone anabolic agents. 4-Alkoxy derivatives were found to be novel ALPase enhancers without inhibitory effect on P450 activity. Among these derivatives, compound 6k was orally administered to ovariectomized rats, and it was found to significantly improve areal bone mineral density at a dose of 30 mg/kg/day.
An Efficient Method for the Preparation of 4-Alkoxy-substituted Thieno[2,3-b]pyridines
作者:Tsuyoshi Shinozuka、Keiji Saito、Satoru Naito
DOI:10.3987/com-14-12986
日期:——
An efficient method for the preparation of 4-alkoxy-substituted thieno[2,3-b]pyridines is described. The key intermediates, 4-alkoxy-2-chloro-3-cyanopyridines, were synthesized from a variety of alcohols by nucleophilic substitution with 3-cyano-2,4-dichloropyridine or by Mitsunobu reaction with 2-chloro-4-hydroxynicotinonitrile. Subsequent reaction of 4-alkoxy-2-chloro-3-cyanopyridines with 2-(acetylthio)acetamide under basic conditions provided 4-alkoxy-substituted thieno[2,3-b]pyridines in fair to good yields.
Houben; Zivadinavitsch, Chemische Berichte, 1936, vol. 69, p. 2360