Michael C. Pirrung, Koushik Das Sarma: Multicomponent Reactions Are Accelerated in Water. In: Journal of the American Chemical Society. Band126, Nr.2, Januar 2004, S.444–445, doi:10.1021/ja038583a.
K. Rossen, P. J. Pye, L. M. DiMichele, R. P. Volante, P. J. Reider: An efficient asymmetric hydrogenation approach to the synthesis of the Crixivan® piperazine intermediate. In: Tetrahedron Letters. Band39, Nr.38, 17. September 1998, S.6823–6826, doi:10.1016/S0040-4039(98)01484-1.