作者:Ian O'Neil、Clare Murray、Rachel Hunter、S. Kalindjian、Terry Jenkins
DOI:10.1055/s-1997-693
日期:——
Two concise and high yielding routes to the antitumour antibiotic pyrrolo-[2,1-c][1,4]-benzodiazepine ring system are described. Thus, condensation of prolinol with 2-azidobenzoylchloride gives the tertiary amide (3). Oxidation to the aldehyde (4) followed by generation of the phosphoroimine by Staudinger reaction results in ring closure via an aza-Wittig reaction to yield the desired ring system. Alternatively, coupling of prolinol with the appropriate isatoic anhydride yields the corresponding amino alcohol. Oxidation with Dess-Martin periodinane yields the PBDs in moderate to good yield.
描述了两条简明且高产的合成肿瘤抗生素吡咯并[2,1-c][1,4]-苯二氮杂平环系统的路线。因此,脯氨醇与2-叠氮苯甲酰氯缩合生成三级酰胺(3)。然后氧化为醛(4),再通过斯陶丁格反应生成磷氮烯,最终通过氮-威蒂格反应环合,得到所需的环系统。另一种方法是将脯氨醇与适当的异苯二酸酐偶联生成相应的氨基醇。随后用Dess-Martin周期烯烃氧化反应生成PBDs,产率中等至良好。