Hantzsch Synthesis of Pyrazolo[1‘,2‘:1,2]pyrazolo[3,4-<i>b</i>]pyridines: Partial Agonists of the Calcitonin Receptor
作者:Eric E. Boros、David J. Cowan、Richard F. Cox、Makda M. Mebrahtu、Michael H. Rabinowitz、James B. Thompson、Lawrence A. Wolfe
DOI:10.1021/jo050370b
日期:2005.6.1
prevention of osteoporosis. Bicycloeneamine 1 was a useful intermediate in the synthesis of pyrazolopyridine calcitonin receptor partial agonists 2a−f. Dihydropyridines 10a−c were conveniently prepared by reaction of 1 with Knoevenagel adducts 9a−c, or in the case of 10d, by a three component reaction with 1, β-ketoester 7b, and aldehyde 8c. Oxidation of 10a−d to pyridines 11a−d and subsequent amide formation