Phenylalanine, 4-chloro-, methyl ester → 2-[[[(Ethoxycarbonyl)amino]thioxomethyl]amino]-3-(4-chlorophenyl)-propionic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

Methyl ester 1-1 (394 mg, 1.58 mmol) was dissolved in methylene chloride (4.0 mL) and diisopropylethylamine (0.82 mL, 4.73 mmol). The solution was cooled to 0° C. and ethoxycarbonyl isothiocyanate (0.21 mL, 1.73 mmol) was added dropwise. The mixture was allowed to warm to room temperature and was stirred 30 min. Methylene chloride (20 mL) was added, and the organic layer was washed with water (20 mL), 10% aqueous HCl (20 mL), and saturated brine (20 mL). The organic layer was dried with MgSO4, filtered and the solvent was removed in vacuo to yield the product as a yellow oil in 92% yield (502 mg, 1.45 mmol). 1H NMR (300 MHz, CDCl3): δ=10.10 (d, 1H, J=6.6 Hz), 8.11 (s, 1H), 7.27 (d, 2H, J=8.1 Hz), 7.10 (d, 2H, J=8.1 Hz), 5.25 (t, 1H, J=6.3 Hz), 4.23 (q, 2H, J=7.2 Hz), 3.73 (s, 3H), 3.32 (dd, 1H; J=14.1, 6.0 Hz), 3.20 (dd, 1H, J=13.8, 6.0 Hz), 1.30 (t, 3H, J=7.2 Hz); 13C NMR (75 mHz, CDCl3): δ=179.4, 170.8, 152.6, 134.2, 133.4, 130.8, 129.0, 63.2, 59.2, 53.6, 52.8, 36.8, 14.4; ESI-MS calcd for C14H17ClN2O4S [M+Na]+: 267.0495. found 267.0495.

Provenance & Evidence