research article
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, e.g., I, have been synthesized. A three-component reaction of a sugar amino acid (SAA) deriv., an aldehyde, and a dipeptide isonitrile in refluxing methanol afforded the corresponding 5-aminooxazole which, after sapon., underwent a trifluoroacetic acid promoted macrocyclization to furnish the cyclic sugar amino acids. [on SciFinder (R)]