New methodology for the N-alkylation of 2-amino-3-acylthiophenes
作者:Luigi Aurelio、Bernard L. Flynn、Peter J. Scammells
DOI:10.1039/c0ob01156h
日期:——
2-Amino-3-acylthiophenes are known to allosterically modulate the A1adenosine receptor and are also used as intermediates in the synthesis of therapeutic agents and pharmacophores such as thienoazepines and thienopyrimidines. The N-alkylation of 2-aminothiophenes has been notoriously difficult to accomplish under mild conditions and there are very few examples of N-alkylated 2-aminothiophenes in the literature, all of which use forcing conditions to effect the alkylation. Here we describe the synthesis of such compounds under mild conditions utilising 2-carbamoylamino and 2-acylamino-3-acylthiophenes with caesium carbonate, and tetrabutylammonium iodide in DMF.