摘要:
Michael addition of lithiated 2,5-dimethoxypivaloylaniline to diisopropyl arylidenmaionates, followed by acid cyclization, affords 5,8-dimethoxy-4-aryl-3,4-dihydro-2(1H)quinolinines (5). These compounds are very inert to the 3,4-dehydrogenation, but were easily transformed to 4-aryl-3,4-dihydro-(1H)quinoline-2,5,8-triones (10) which, through Diels-Alder heterocyclization, gave 4-aryl-3,4-dihydro- 1,8-diazaanthracene-2,9,10-triones (16). (C) 1997 Elsevier Science Ltd.