An Efficient, PIFA Mediated Approach to Benzo-, Naphtho-, and Heterocycle-Fused Pyrrolo[2,1-<i>c</i>][1,4]diazepines. An Advantageous Access to the Antitumor Antibiotic DC-81
作者:Arkaitz Correa、Imanol Tellitu、Esther Domínguez、Isabel Moreno、Raul SanMartin
DOI:10.1021/jo047872u
日期:2005.3.1
The synthesis of a series of optically pure benzo-, naphtho-, and heterocycle-fused pyrrolo[2,1-c][1,4]-diazepin-5,11-dione derivatives starting from l-proline methyl ester is presented. The synthetic plan includes an aroylation step at the proline nitrogen followed by transformation of the ester residue into a N-methoxyamide group. The subsequent key cyclization step embraces the PIFA mediated formation
提出了从1-脯氨酸甲酯开始合成一系列光学纯的苯并,萘和杂环稠合的吡咯并[2,1- c ] [1,4]-二氮杂-5,11-二酮衍生物。合成计划包括在脯氨酸氮上进行芳构化步骤,然后将酯残基转化为N-甲氧基酰胺基团。随后的关键环化步骤包括PIFA介导的N的形成-酰基硝基re中间体及其后续的分子内被芳环的俘获。提出的通用方法解决了从不太容易获得的氨基(或相关功能)芳香族起始原料开始的需要,并且其有效性在抗肿瘤抗生素DC-81的合成中得到了证明。