Orthoamides by selective borohydride reduction of N,N′,N″-triacyl- and N,N′,N″-tri(alkoxycarbonyl)-guanidines
作者:Matthew C. Davis、Thomas J. Groshens
DOI:10.1016/j.tetlet.2018.12.060
日期:2019.1
N,N′,N″-Triacylguanidines and N,N′,N″-tri(alkoxycarbonyl)guanidines were prepared and reduced with borohydride salts in a mixture of tetrahydrofuran and acetic acid to give triacyl and tri(alkoxycarbonyl) orthoamides in yields of 40–85%. However, similar reduction of N,N′,N″-tri(t-butoxycarbonyl)guanidine did not give orthoamide but the aminal di(t-butyl) methylenedicarbamate.
Process for the Preparation of (R)-5-(2-Aminoethyl)-1-(6,8-Difluorochroman-3-YL)-1,3-Dihydroimidazole-2-Thione
申请人:Soares Da Silva Patrício Manuel Vieira Araújo
公开号:US20100121073A1
公开(公告)日:2010-05-13
A process for making (R)-5-(2-aminoethyl)-1-(6,8-difluorochroman-3-yl)-1,3-dihydroimidazole-2-thione and pharmaceutically acceptable salts thereof, and for making intermediates useful in the formation of said compound.
Process for the Preparation of (R) - 5 - (2-Aminoethyl) -1- (6, 8-Difluorochroman-3-YL) -1,3-Dihydroimidazole-2-Thione
申请人:Soares Da Silva Patricio Manuel Vieira Araújo
公开号:US20100113799A1
公开(公告)日:2010-05-06
A process for making (R)-5-(2-aminoethyl)-1-(6,8-difluorochroman-3-yl)-1,3-dihydroimidazole-2-thione and pharmaceutically acceptable salts thereof, and for making intermediates useful in the formation of said compound.
A process for preparing a compound of formula (22), comprising reducing a compound of formula (21), to produce a compound of formula (23), followed by the hydrogenolysis of the compound of formula 23 in a solvent comprising a C
1
to C
6
alkyl sulfonic acid and optionally a chlorinated solvent.