Synthesis and epimerization of phenylalanyl 4-aminocyclophosphamides
作者:Yongying Jiang、Zhoupeng Zhang、Robert S. DiPaola、Longqin Hu
DOI:10.1016/j.tet.2007.08.009
日期:2007.10
trans-configuration ((2S,4R)- and (2R,4S)-) were found to be less stable than the corresponding isomers of the cis-configuration ((2R,4R)- and (2S,4S)-) and to undergo epimerization of the C-4 chiral center in the presence of 25% TFA used during Boc deprotection. The synthetic route developed should be applicable to the synthesis of a variety of peptide and amino acid conjugates of 4-aminocyclophosphamide