2,2-Difluoro-1,3-benzodioxole-5-carbonyl chloride → 2,2-Difluoro-benzo[1,3]dioxole-5-carboxylic Acid [4-((S)-2-amino-propoxy)-3-(2-methyl-2H-pyrazol-3-yl)-phenyl]-amide

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl (S)-1-(4-amino-2-(1-methyl-1H-pyrazol-5-yl)phenoxy)propan-2-ylcarbamate (40.0 mg, 115 μmol) in DCM was added 2,2-difluorobenzo[d][1,3]dioxole-5-carbonyl chloride (28.0 mg, 127 μmol) followed by TEA (32.2 μl, 231 μmol). The reaction was mixed in a rotary shaker at 25° C. for 1 hour then quenched with MeOH (100 μl). After mixing for 20 minutes TFA (400 μl) was added and the resulting mixture was heated to 40° C. and mixed for 1 hour. The organic solvent was removed under vacuum; the crude residue was dissolved in acetonitrile (0.5 mL), neutralized with saturated bicarbonate and subjected to purification by preparative LCMS. The proper fractions were pooled, frozen and lyophilized to afford the title compound as an off white solid (16.7% yield). LCMS m/z=431.3 (M+H); 1H NMR (400 MHz, DMSO-d6) δ ppm 1.16 (d, J=6.82 Hz, 3 H), 3.48-3.58 (m, 1 H), 3.71 (s, 3 H), 3.99-4.08 (m, 2 H), 6.36 (d, J=1.77 Hz, 1 H), 7.25 (d, J=9.09 Hz, 1 H), 7.50 (d, J=1.77 Hz, 1 H), 7.60 (d, J=8.59 Hz, 1 H), 7.71 (d, J=2.53 Hz, 2 H), 7.82-7.91 (m, 2 H), 10.35 (s, 1 H).

Provenance & Evidence