Toluene → HCID 178500718, compound

Participants

Reaction Steps

To a solution of cis-(3-hydroxy-cyclobutyl)-acetic acid methyl ester (570 mg, 3.96 mmol), triphenylphosphine (2.08 g, 7.92 mmol), and 4-nitrobenzoic acid (1.32 g, 7.92 mmol) in dry THF (50 mL), 40% diethyl azodicarboxylate in toluene (1.42 mL, 7.92 mmol) is added at room temperature. The mixture is stirred at room temperature for 15 hours. The solvent is removed under reduced pressure, and the obtained residue is purified by silica gel column chromatography to give trans-4-nitro-benzoic acid 3-methoxycarbonylmethyl-cyclobutyl ester (558 mg, 48%); TLC (hexane/AcOEt, 3:1) Rf 0.31, 1H NMR (400 MHz, chloroform-d) δ ppm 2.28-2.35 (m, 2H), 2.44-2.51 (m, 2H), 2.56 (d, 2H), 2.82-2.87 (m, 1H), 3.69 (s, 3H), 5.33-5.40 (m, 1H). 8.18-8.30 (m, 4H).

Provenance & Evidence