Intramolecular aminopalladation of alkynylamines gave intermediary alkenylpalladium compounds that hydrolyzed and isomerized to thermodynamically stable cyclic imines. Treatment of 3-alkynylamines with a catalytic amount of PdCl2(MeCN)2 gave exclusively 1-pyrrolines in good yields; 5-alkynylamines afforded 2,3,4,5-tetrahydropyridines selectively. Treatment of 4-alkynylamines with Pd(II) afforded mixtures of both 5- and 6-membered cyclic imines. Applications to the synthesis of some naturally occurring alkaloids are also described.
Direct conversion of azides to carbamates and sulfonamides using Fe/NH4Cl: effect of sonication
作者:S Chandrasekhar、Ch Narsihmulu
DOI:10.1016/s0040-4039(00)01373-3
日期:2000.10
A simple, direct and effective conversion of azides to carbamates and sulfonamides is achieved using Fe/NH4Cl in methanol. The influence of sonication and direct application in solution phase combinatorial chemistry are also studied by developing a 6x4 matrix library. (C) 2000 Elsevier Science Ltd. All rights reserved.