Isidro-Llobet Albert, Alvarez Mercedes, Burger Klaus, Spengler Jan, Albericio Fernando
Institute for Research in Biomedicine, Barcelona Science Park, University of Barcelona, Josep Samitier 1-5, E-08028 Barcelona, Spain.
Org Lett. 2007 Apr 12;9(8):1429-32. doi: 10.1021/ol063148h. Epub 2007 Mar 17.
[reaction: see text] 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.