Convenient syntheses of substituted 7,12-dioxa-benzo[a]anthracenes and 7,12-dioxa-5-aza-benzo[a]anthracenes
摘要:
The syntheses of 7,12-Dioxa-benzo[a]anthracenes bearing in C-6 a carboxymethyl group and 5-aza analogues are described. The key steps are intramolecular cyclisations of 3-arylbenzo[1,4]dioxin-2-diethylcarboxamides and palladium catalysed methoxycarbonylation of aryl triflates. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Synthesis of 3-arylbenzo[1,4]dioxin-2-carboxamides by palladium-catalysed coupling of vinylstannanes with aryl halides
摘要:
Aryl iodides or bromides undergo a Pd (0)-CuI catalysed coupling with 3-(trialkylstannyl) benzo[1,4]dioxin-2-carboxamides to provide the corresponding 3-aryl derivatives. (C) 1997 Published by Elsevier Science Ltd.