Synthesis Of The Southern Tripeptide (C-1-N-12) Of Sanglifehrins Using Asymmetric Organocatalysis

The tripeptide southern region of the novel cyclophilin binding natural product macrolides, namely sanglifehrins, is synthesized involving asymmetric organocatalysis as chirality-inducing step. List's asymmetric alpha-amination was used in the synthesis of the m-hydroxyphenylalanine part, whereas alpha-hydrazination was used for the piperazic ester part.