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Scheme for the synthesis of vinyl phenyl sulfones with Leu at the P2 position and homoPhe at the P1 position. Et, ethyl; Ph, phenyl; TFA, trifluoroacetic acid; THF, tetrahydofuran; EDC, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride; HOBT, 1-hydroxybenzotriazole hydrate; NMM, N-methylmorpholine; DMF, N-dimethylformamide.
