作者:Kirk L. Stevens、David K. Jung、Michael J. Alberti、Jennifer G. Badiang、Gregory E. Peckham、Jim M. Veal、Mui Cheung、Philip A. Harris、Stanley D. Chamberlain、Michael R. Peel
DOI:10.1021/ol0519745
日期:2005.10.1
[reaction: see text] A convergent synthesis of substituted pyrazolo[1,5-a]pyridines has been achieved either via a regioselective [3 + 2] cycloaddition of N-aminopyridines with alkynes or by thermal cyclization of disubstituted azirines. Subsequent palladium-catalyzed introduction of pyridines or de novo synthesis of pyrimidines affords inhibitors of p38 kinase.
[反应:见正文]通过N-氨基吡啶与炔烃的区域选择性[3 + 2]环加成反应或双取代叠氮基的热环化,已实现了取代吡唑并[1,5-a]吡啶的收敛合成。随后钯催化的吡啶的引入或嘧啶的从头合成提供了p38激酶的抑制剂。