Cesium fluoride and tetra-n-butylammonium fluoride mediated 1,4-N→O shift of disubstituted phenyl ring of a bicalutamide derivative
作者:Renukadevi Patil、Wei Li、Charles R. Ross、Elfi Kraka、Dieter Cremer、Michael L. Mohler、James T. Dalton、Duane D. Miller
DOI:10.1016/j.tetlet.2006.03.154
日期:2006.6
A novel 1,4-N -> O migration of a disubstituted phenyl ring was observed during N-methylation of a bicalutamide derivative, (2S)-2-(tert-butyidimethylsilanyloxy)-N-(4-cyano-3-trifluoromethylphenyl)-3-(4-fluorophenoxy)-2-methylpropionamide, in the presence of CsF-Celite/acetonitrite and desilylation of (2S)-2-(tert-butyldimethylsilanyloxy)-N-(4-cyano-3-trifluoromethylphenyl)-3-(4-fluorophenoxy)-2,N-dimethylpropionamide in tetra-n-butylammonium fluoride/THF. Both NMR and X-ray analysis confirmed the structure of the 1,4-N -> O disubstituted phenyl ring migrated product. (c) 2006 Elsevier Ltd. All rights reserved.