Efficient Synthesis of Polysubstituted 1,5-Benzodiazepinone Dipeptide Mimetics via an Ugi-4CR-Ullmann Condensation Sequence

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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(5 H)-one dipeptide mimetics with potential CCK2-antagonist properties is reported.

Originele taal-2English
Pagina's (van-tot)1719-1724
Aantal pagina's6
Nummer van het tijdschrift17
StatusPublished - 6 jul 2021

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