3-(Methylthio)phenyl isocyanate → 4-[3-(3-Methylsulfanylphenyl)-1-spiro[5.5]undec-3-yl-ureidomethyl]benzoic acid methyl ester

Participants

Reaction Steps

The above 4-(spiro[5.5]undec-3-ylaminomethyl)benzoic acid methyl ester (1.02 g, 3.2 mmol) was added acetonitrile (50 mL) and 3-(methylthio)phenylisocyanate (668 mg, 4 mmol). Upon stirring for 2 days, the reaction appeared incomplete as shown by HPLC, so another portion of 3-(methylthio)phenylisocyanate (240 mg) was added. After stirring for 2 hours the solvent was evaporated. The residue was taken up in dichloromethane (2 mL) and purified by chromatography on silica using dichloromethane as eluent affording 4-[3-(3-methylsulfanylphenyl)-1-spiro[5.5]undec-3-yl-ureidomethyl]benzoic acid methyl ester (680 mg).

Provenance & Evidence