Rapid Synthesis of Benzodiazepines
by Ring Expansion of Aziridines with Anthranilic Acids
by Using a Grinding Technique

Atul K. Singh; Lal Dhar S. Yadav

doi:10.1055/s-0031-1289670

PAPER

Rapid Synthesis of Benzodiazepines by Ring Expansion of Aziridines with Anthranilic Acids by Using a Grinding Technique

Atul K. Singh, Lal Dhar S. Yadav*
Green Synthesis Lab, Department of Chemistry, University of Allahabad, Allahabad 211 002, India
Fax: +91(532)2460533; e-Mail: ldsyadav@hotmail.com;

Abstract

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Abstract

A grinding-induced, atom-economic, rapid, efficient, one-pot protocol was developed for the synthesis of pharmaceutically relevant benzo-1,4-diazepin-5-ones in excellent yields (72-91%) and high regioselectivities. The method involves a ring-opening-ring-closure cascade of aziridines with anthranilic acids by grinding the neat reactants at room temperature in the presence of lithium bromide as a mild catalyst. Among the advantages of this protocol are its economic viability, the ability to recycle the catalyst, and the formation of water as the only byproduct.

Key words

heterocycles - cyclizations - solid-phase synthesis - cascade reactions - benzodiazepines

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