Triethylamine → (S)-4-methylsulfanyl-2-(1-oxo-4-trifluoromethyl-1,3-dihydro-isoindol-2-yl)-butyric acid methyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of (S)-2-amino-4-methylsulfanyl-butyric acid methyl ester hydrochloride (Aldrich, 199 mg, 1 mmol) and 2-bromomethyl-3-trifluoromethyl-benzoic acid methyl ester (prepared as in Example 1, 297 mg, 1 mmol) in acetonitrile (5 mL) and triethylamine (280 μL, 2 mmol) was placed in a microwave reaction vessel and sealed. The reaction mixture was then placed in a microwave reactor and heated at 115° C. for 15 min. After this time, the reaction mixture was cooled and concentrated with silica gel (2 g) in vacuo. The silica gel with absorbed material was placed in a SIM and purified via Biotage flash column chromatography (40 S silica gel column, 25% ethyl acetate/hexanes) to afford (S)-4-methylsulfanyl-2-(1-oxo-4-trifluoromethyl-1,3-dihydro-isoindol-2-yl)-butyric acid methyl ester (137 mg, 40%) as a colorless viscous oil: HR-ES(+) m/e calcd for C15H16NO3SF3 [M+H]+ 348.0876, observed 348.0874; 1H NMR (400 MHz, CHLOROFORM-d) δ 8.07 (d, J=7.46 Hz, 1H), 7.83 (d, J=7.67 Hz, 1H), 7.64 (t, J=7.67 Hz, 1H), 5.25 (dd, J=4.69, 10.44 Hz, 1H), 4.79 (d, J=17.47 Hz, 1H), 4.53 (d, J=17.47 Hz, 1H), 3.77 (s, 3H), 2.38-2.62 (m, 3H), 2.16-2.31 (m, 1H), 2.13 (s, 3H).

Provenance & Evidence