作者:Per Wiklund、Mark Rogers-Evans、Jan Bergman
DOI:10.1021/jo049169b
日期:2004.9.1
5(2H,4H)-diones have ever been published and the claimed products have often been poorly characterized. Through the present work several 1H-1,4-benzodiazepine-3,5(2H,4H)-diones have become available from N-carbamoylmethylanthranilic acids. The required ring closures were achieved only when the amino groups of the starting materials were substituted with electron withdrawing groups such as acetyl, alkyloxycarbonyl
尽管苯二氮卓类药物在药物化学中具有很强的地位,但很少有合成1 H -1,4-苯并二氮杂-3,5(2 H,4 H)-二酮的合成路线,而且所要求保护的产品通常很难鉴定。通过本工作,N-氨基甲酰基甲基邻氨基苯甲酸可得到几种1 H -1,4-苯并二氮杂-3,5(2 H,4 H)-二酮。仅当原料的氨基被吸电子基团如乙酰基,烷氧基羰基或亚硝基取代时,才达到所需的闭环。在合成过程中,新的1-亚硝基-1 H环收缩重排观察到-1,4-苯并二氮杂卓-3,5(2 H,4 H)-二酮成3 H-喹唑啉-4-一。拟议中的机制涉及消除HNO,然后是质子介导的CO损失。1-亚硝化的1,4-苯并二氮杂二酮可分别脱硝为相应的氨基化合物。