Soluble tag-assisted peptide head-to-tail cyclization: total synthesis of mahafacyclin B

A soluble tag-assisted liquid-phase method was successfully applied to peptide head-to-tail cyclization, leading to the total synthesis of antimalarial cyclic heptapeptide, mahafacyclin B (1). The cyclization was carried out in the liquid phase with the tag remaining, which allowed rapid reaction workup and product isolation.