Silver-catalysed/microwave-assisted domino reactions of 2-alkynyl-acetophenones and 3-acetyl-2-alkynylpyridines in the presence of ammonia are widely described. In most cases the reaction give a mixture of the imino- and carbo-cyclisation products, with a general preference for the former. A plausible mechanism is proposed and the dual activity of silver salts is supported by NMR experiments.
In this account, we summarize the peculiar effects and advantages of gold, silver, and titanium dual role catalysis over the uncatalyzed tandem imination/annulation processes of gamma- and delta-ketoalkynes. (C) 2010 Elsevier B.V. All rights reserved.
SELVARAJ, S.;RAMAKRISHNAN, P. S.;ARUMUGAM, N., REC. TRAV. CHIM. PAYS-BAS, 108,(1989) N, C. 36-37
作者:SELVARAJ, S.、RAMAKRISHNAN, P. S.、ARUMUGAM, N.
DOI:——
日期:——
Selvaraj, S.; Ramakrishnan, P. S.; Arumugam, N., Recueil des Travaux Chimiques des Pays-Bas, 1989, vol. 108, # 1, p. 36 - 37