An efficient three-step synthesis towards 3-amino-1,4-benzodiazepin-2-one derivatives is presented. The versatile Ugi-4-component reaction (Ugi-4CR) and Boc deprotection is followed by a ligand-free Ullmann condensation. This protocol allows the rapid construction of a diverse array of substituted 1,5-benzodiazepinones. Since Ugi-based products are typically limited by their ‘inert’ C-terminal amides, the use of a convertible (‘cleavable’) isocyanide was envisaged and resulted in building blocks that can be made SPPS compatible. To demonstrate the potential of this novel synthetic route, the design and preparation of novel phenylurea-1,5-benzodiazepin-4(5H)-one dipeptide mimetics with potential CCK2-antagonist properties is reported.

中文翻译：

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通过 Ugi-4CR-Ullmann 缩合序列有效合成多取代 1,5-苯并二氮杂酮二肽模拟物

提出了对 3-amino-1,4-benzodiazepin-2-one 衍生物的有效三步合成。通用的 Ugi-4 组分反应 (Ugi-4CR) 和 Boc 脱保护之后是无配体的 Ullmann 缩合。该协议允许快速构建多种取代的 1,5-苯二氮卓酮。由于基于 Ugi 的产品通常受其“惰性”C 端酰胺的限制，因此设想使用可转化（“可裂解”）异氰化物并产生可与 SPPS 兼容的构建块。为了证明这种新型合成路线的潜力，报道了具有潜在 CCK2 拮抗剂特性的新型 phenylurea-1,5-benzodiazepin-4(5H)-one 二肽模拟物的设计和制备。