A convenient microwave-enhanced solid-phase synthesis of difficult peptide sequences: case study of Gramicidin A and CSF114(Glc).

Taking into account that microwave technology applied to SPPS is proposed as a valid support to the enhancement of efficiency of coupling reactions in short times, we compared the efficacy of a new automatic monomode microwave instrument versus a traditional automatic peptide synthesizer in the synthesis of different difficult peptide sequences. We verified that microwave-assisted solid phase synthesis is convenient, in terms of yield, purity, and time consumed to prepare two peptides which were previously shown to be difficult to obtain by conventional strategy, i.e., the antibiotic Gramicidin A and a glycopeptide.