Application of Microwave Irradiation to the Synthesis of 14-Helical β-Peptides

Abstract
We have evaluated the effects of microwave irradiation on the solid-phase synthesis of β-peptides. Sequences designed to adopt the 14-helix, especially those containing the structure-promoting residue trans-2-aminocyclohexanecarboxylic acid (ACHC), suffer from poor synthetic efficiency under standard SPPS conditions. A comparison of microwave and conventional heating shows that both provide excellent synthetic results for shorter sequences; however, we identify a clear benefit from microwave irradiation for longer β-peptides.