Sterically Hindered <i>C</i><sup>α</sup><sup>,</sup><sup>α</sup>-Disubstituted α-Amino Acids: Synthesis from α-Nitroacetate and Incorporation into Peptides
作者:Yanwen Fu、Lars G. J. Hammarström、Tod J. Miller、Frank R. Fronczek、Mark L. McLaughlin、Robert P. Hammer
DOI:10.1021/jo015809o
日期:2001.10.1
demanding C(alpha,alpha)-dibenzylglycine (Dbg) has been incorporated into a peptide using solid-phase synthesis. It was found that once sterically congested Dbg is at the peptide N-terminus, further chain extension becomes very difficult using uronium or phosphonium salts (PyAOP, PyAOP/HOAt, HATU). However, preformed aminoacid symmetrical anhydride couples to N-terminal Dbg in almost quantitative yield