Rapid synthesis of cyclodepsipeptides containing a sugar amino acid or a sugar amino alcohol by a sequence of a multicomponent reaction and acid-mediated macrocyclization.

Cyclodepsipeptides incorporating a sugar amino acid (alcohol) have been synthesized. A three-component reaction of a sugar amino acid (SAA) derivative, an aldehyde, and a dipeptide isonitrile in refluxing methanol afforded the corresponding 5-aminooxazole which, after saponification, underwent a trifluoroacetic acid promoted macrocyclization to furnish the cyclic sugar amino acids.