Synthesis of a fully protected (2S,3R)-N-(1′,1′-dimethyl-2′- propenyl)-3-hydroxytryptophan from tryptophan

(2S,3R)-N-(1′,1′-Dimethyl-2′-propenyl)-3-hydroxytryptophan, a key amino acid of the anti-inflammatory cyclic peptide, cyclomarin C, has been synthesized stereoselectively, with full protection, from l-tryptophan for the first time.