Access to a Novel Class of Tetracyclic 1,4-Benzodiazepin-5-ones Starting from α-Amino Acids by Pd-Catalyzed Amination/1,3-Dipolar Cycloaddition as the Key Steps
作者:Luca Basolo、Egle M. Beccalli、Elena Borsini、Gianluigi Broggini、Maisaa Khansaa、Micol Rigamonti
DOI:10.1002/ejoc.200901290
日期:2010.3
preparation of the novel class of tetracyclic imidazo[2,1-c]pyrazolo[1,5-a][1,4]benzodiazepine-5,8-diones is reported. The protocol uses cheap and easily accessible α-amino acids as chiral-pool starting materials and leads to products in an enantiopure form. An intramolecular palladium-catalyzed amination process to form the imidazole nucleus and an intramolecular 1,3-dipolar cycloaddition reaction to simultaneously
报道了一种用于制备新型四环咪唑并 [2,1-c] 吡唑并 [1,5-a][1,4] 苯并二氮杂-5,8-二酮类的简便方法。该协议使用廉价且易于获取的 α-氨基酸作为手性池起始材料,并产生对映纯形式的产品。分子内钯催化胺化过程形成咪唑核和分子内1,3-偶极环加成反应同时获得吡唑和1,4-二氮杂环是关键步骤。