Microwave irradiation greatly improves the results of the cyclocondensation between anthranilic acid and lactim ethers derived from 2,5-piperazinediones in terms of reaction times, yields and stereocenter integrity, leading to pyrazino[2,1-b]quinazoline-3,6-diones. The microwave-assisted reaction was also much better than the thermal one when applied to a bis-lactim ether, leading to the corresponding pentacyclic pyrazino [2,1-b:5,4-b′]diquinazoline-5,13-dione in excellent yield, and it also improved the preparation of compounds containing the ring system of the anti-MDR natural product N-acetylardeemin.
微波辐射极大地改善了
邻氨基苯甲酸与2,5-
哌嗪二酮衍生的内
酰亚胺之间的环缩合反应时间、产率和立构中心完整性,从而生成
吡嗪并[2,1-b]
喹唑啉-3,6-二酮。当应用于双内
酰亚胺醚时,微波辅助反应也比热反应好得多,导致在优良的收率,同时也改进了抗MDR
天然产物N-乙酰葆明含环体系化合物的制备。