Synlett 2007(13): 2127-2129  
DOI: 10.1055/s-2007-984875
LETTER
© Georg Thieme Verlag Stuttgart · New York

One-Pot Synthesis of Symmetrical and Unsymmetrical Diketopiperazines from Unprotected Amino Acids

Anne Friedricha, Manuel Jaintaa, Martin Niegerb, Stefan Bräse*a
a Institute of Organic Chemistry, University of Karlsruhe (TH), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
Fax: +49(721)6088581; e-Mail: braese@ioc.uka.de;
b Laboratory of Inorganic Chemistry, University of Helsinki, 00014 Helsinki, Finland
Further Information

Publication History

Received 25 April 2007
Publication Date:
27 June 2007 (online)

Abstract

An efficient synthesis of symmetrical and unsymmetrical proline-type diketopiperazines using a phosphite-promoted ­coupling was used to generate diketopiperazines with overall good yields from unprotected amino acids.

13

CCDC-650358 contains the crystallographic data for 8a. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.uk/data_request/cif.