Abstract
A simple and efficient protocol for base-mediated selective synthesis of 2-(arylamino)ethanols from primary aromatic amines and 2-aryloxyethanols from phenols, promoted by K2 CO3 has been achieved under mild conditions. Even in presence of excess alkyl halide, selective mono-N-alkylation has been achieved. Tolerance of a variety of functional groups is demonstrated by 15 examples of selective N-alkylation of aromatic amines and 19 examples of O-alkylation of phenols. The efficacy of the protocol is demonstrated by the formal synthesis of Ticlopidine® , Vildagliptin® , Quetiapine® , and Gemfibrozil® .
Key words selective N-alkylation - 2-(arylamino)ethanols - amines - 2-aryloxyethanols - phenols - K
2 CO
3 promoted - Na
2 CO
3 controlled