α-Methylphenacyl (Mpa) thioesters are described as precursors of thioacids. Mpa thioesters are accessible via the condensation of carboxylic acids and phenacyl thiol, which is easily prepared without column chromatography. The Mpa thioesters are selectively deprotected by reduction with zinc dust in the presence of conventional thioacid protecting groups. In addition, the Mpa group exhibits orthogonal
Preparation of peptide thioacids using the Kaiser oxime resin
作者:Alan W. Schwabacher、Terry L. Maynard
DOI:10.1016/s0040-4039(00)91771-4
日期:1993.2
Peptide C-terminal thioacids are readily prepared with protecting groups intact by cleavage of peptides from Kaiser's oxime ester resin by treatment with hexamethyldisilathiane/tetrabutylammonium fluoride. Such thioacids are useful for peptide fragment couplings.