Microwave-Assisted Stereoselective One-Pot Synthesis of Symmetrical and Unsymmetrical 2,5-Diketopiperazines from Unprotected Amino Acids
作者:Manuel Jainta、Martin Nieger、Stefan Bräse
DOI:10.1002/ejoc.200800605
日期:2008.11
The facile condensation of unprotected aminoacids by a phosphite-promoted one-step coupling reaction is a highly efficient synthesis to generate stereoselective and optically pure symmetrical and unsymmetrical functionalized diketopiperazines. The use of microwaves enhanced by small amounts of ionic liquid is accompanied by significant improvement in reaction times and yields. Simple filtration through
Annulated Diketopiperazines from Dipeptides or Schöllkopf Reagents via Tandem Cyclization−Intramolecular N-Arylation
作者:Hwan Jung Lim、Judith C. Gallucci、T. V. RajanBabu
DOI:10.1021/ol100663y
日期:2010.5.7
Facile CuI-mediated N-arylation of diketopiperazine using the Fukuyama modification of the Ullmann−Goldberg reaction can be exploited in new approaches to enantiopure polycyclic diketopiperazinesfrom easily assembled dipeptides or functionalized Schöllkopf reagents.