Isopropenyl chloroformate → prop-1-en-2-yl 2-fluoro-4-(2-(1-methyl-1H-pyrazol-4-yl)pyridin-4-yloxy)phenylcarbamate

Participants

Reaction Steps

A mixture of Example A1 (2.0 g, 7.04 mmol) and saturated aq NaHCO3 (100 mL) in EtOAc (100 mL) was cooled in an ice bath and treated with isopropenyl chloroformate (1.6 mL, 14.64 mmol). The reaction mixture was allowed to slowly warm to RT overnight. The organic layer was separated and washed with sat aq NaHCO3 (25 mL) and brine (25 mL), dried (MgSO4), concentrated in vacuo and was re-crystallized (diethylether) to provide prop-1-en-2-yl 2-fluoro-4-(2-(1-methyl-1H-pyrazol-4-yl)pyridin-4-yloxy)phenylcarbamate (2.32 g, 90% yield). 1H NMR (400 MHz, DMSO-d6): δ 9.69 (br s, 1 H), 8.38 (d, J=5.6 Hz, 1 H), 8.26 (s, 1 H), 7.96 (d, J=0.8 Hz, 1 H), 7.67 (br t, J=8.4 Hz, 1 H), 7.27 (d, J=2.4 Hz, 1 H), 7.22 (dd, J=11.2, 2.4 Hz, 1 H), 7.00 (m, 1 H), 6.69 (dd, J=5.6, 2.4 Hz, 1 H), 4.74 (m, 1 H), 4.72 (s, 1 H), 3.84 (s, 3 H), 1.92 (s, 3H); MS (ESI) m/z: 369.1(M+H+).

Provenance & Evidence