Triphenylphosphine → 3,5-Dichloro-2-hydroxy-4-(4-tert-butoxycarbonylmethylaminobutoxy)benzoic acid methyl ester

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Reaction Steps

To a solution of 4-tert-butoxycarbonylmethylamino-1-butanol (3 g) and known 3,5-dichloro-2,4-dihydroxybenzoic acid methyl ester (3.85 g) in THF (80 ml) were added triphenylphosphine (4.26 g) and diisopropyl azodicarboxylate (3.2 ml) under ice-cooling, and the mixture was stirred for 16 hours. The reaction mixture was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (developing solvent: hexane/ethyl acetate=4/1 v/v) to give the title compound (5.2 g, yield 83%).

Provenance & Evidence