Alumina-mediated dealkylative dimerization of 4-aminobenzyl esters
摘要:
Treatment of 4-aminobenzyl esters with Al2O3 in DCM at rt afforded the dealkylative dimerized 4,4'-diamino-diphenylmethanes in satisfactory yield. The reaction may proceed via a quinone methide iminium ion intermediate, which may then undergo Michael type addition followed by retro-aldol extrusion of a formaldehyde species. (c) 2007 Elsevier Ltd. All rights reserved.
Alumina-mediated dealkylative dimerization of 4-aminobenzyl esters
摘要:
Treatment of 4-aminobenzyl esters with Al2O3 in DCM at rt afforded the dealkylative dimerized 4,4'-diamino-diphenylmethanes in satisfactory yield. The reaction may proceed via a quinone methide iminium ion intermediate, which may then undergo Michael type addition followed by retro-aldol extrusion of a formaldehyde species. (c) 2007 Elsevier Ltd. All rights reserved.