摘要:
Using a tin-free strategy, novel 4H-benzo[f]pyrazolo[1,5-a][1,3]diazepin-5(6H)-ones were synthesized in acceptable yields via intra-molecular alkylation over a benzene ring, of alpha-alkylcarbonyl radicals generated from ethyl pyrazolylbenzylaminoxanthates, using dilauroyl peroxide (DLP) as the radical initiator. (C) 2011 Elsevier Ltd. All rights reserved.