p-Nitromandelic acid as a safety-catch linker for Boc/Bzl-SPPS of base-labile compounds like peptides and depsipeptides is described. This linker permits acidic removal of side-chain protection groups from the resin. For cleavage from the solid support, the p-nitro group was reduced with tin(II) chloride. After washing off the reducing agents, the (depsi)peptide acids with or without the side-chain protection schemes were obtained by microwave irradiation at 50 degrees C with 5% TFA in dioxane.
Cooperative Effects of Functional Groups in Peptides. II. Elimination Reactions in Aspartyl-(O-acyl)-serine Derivatives<sup>1</sup>
作者:Yechiel Shalitin、Sidney A. Bernhard
DOI:10.1021/ja00972a035
日期:1966.10
Schwenzer,B. et al., Journal fur praktische Chemie (Leipzig 1954), 1979, vol. 321, p. 1007 - 1016