Synthesis and structure of cyclic phosphopeptides containing a phosphodiester linkage
摘要:
The synthesis of three cyclic phosphopeptides, which contain a phosphodiester linkage, is described. Starting from either Boc-L-Ser(OBn)-OH or BOC-L-Thr(OBn)-OH, three precursors for the macro-cyclization by phosphitylation were prepared. After phosphitylation, using 4-chlorobenzyl bis(N,N-diisopropylamino)phosphinite or 4-chlorobenzyl dichlorophosphinite, subsequent oxidation and hydrogenolysis the cyclic phosphopeptides 18-20 were obtained. The solution conformation of cyclic phosphopeptide 18 was studied by NMR spectroscopy and restrained molecular dynamics calculations.