Methods for the Synthesis of 5,6,7,8-Tetrahydro-1,8-naphthyridine Fragments for α<sub>V</sub>β<sub>3</sub> Integrin Antagonists
作者:Frederick W. Hartner、Yi Hsiao、Kan K. Eng、Nelo R. Rivera、Michael Palucki、Lushi Tan、Nobuyoshi Yasuda、David L. Hughes、Steven Weissman、Daniel Zewge、Tony King、Dave Tschaen、R. P. Volante
DOI:10.1021/jo0486950
日期:2004.12.1
The preparation of 3-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)propan-1-amine 2a and 3-[(7R)-7-methyl-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl]propan-1-amine 2b, key intermediates in the synthesis of alpha(V)beta(3) antagonists, is described. The syntheses rely on the efficient double Sonogashira reactions of 2,5-dibromopyridine 3 with acetylenic alcohols 4a/4b and protected propargylamines 10a-e followed by Chichibabin cyclizations of 3,3'-pyridine-2,5-diyldipropan-1-amines 9a/9b.