Triphenylphosphine → 2-{[1-(4-Bromo-benzyloxy)-naphthalene-2-carbonyl]-amino}-2-methyl-propionic acid methyl ester

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Reaction Steps

To a solution of 80 mg of 2-[(1-hydroxy-naphthalene-2-carbonyl)-amino]-2-methyl-propionic acid methyl ester, 52 mg 4-bromobenzyl alcohol and 73 mg triphenyl phosphine in 3 ml of dry THF 56 mg of diisopropylazodicarboxylate were added. After 2 h at room temperature 36 mg of triphenylphosphine and 25 mg of diisopropylazodicarboxylate were added, and after 16 h again 36 mg of triphenylphosphine and 25 mg of diisopropylazodicarboxylate were added. After additional 24 h the reaction was concentrated in vacuo and after chromatography on silica (ethyl acetate/heptane) 96 mg of 2-{[1-(4-bromo-benzyloxy)-naphthalene-2-carbonyl]-amino}-2-methyl-propionic acid methyl ester were obtained.

Provenance & Evidence