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doi:10.1016/S0040-4039(00)01717-2 
Copyright © 2000 Elsevier Science Ltd. All rights reserved.
Synthesis of piperazinones and benzopiperazinones from 1,2-diamines and organoboronic acids*1
Received 31 August 2000;
revised 2 October 2000;
accepted 3 October 2000.
Available online 12 December 2000.
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Abstract
Alkenyl, aryl and heteroaryl boronic acids react with 1,2-diamines and glyoxylic acid to give directly in one step the corresponding piperazinones (2-oxopiperazines). Similarly, the use of monoprotected 1,2-phenylenediamine leads to benzopiperazinones (1,2,3,4-tetrahydroquinoxalin-2-ones).
