Oxalyl chloride → HCID 84651475, compound

To solution of 1-(methoxycarbonyl)cyclopropanecarboxylic acid (144 mg, 1 mmol) was added 2M oxalyl dichloride (1.0 mL, 2.0 mmol) in DCM followed by a few drops of DMF. The reaction mixture was stirred until gas evolution ceased (˜1 h). Excess oxalyl chloride and DCM were evaporated to afford methyl 1-(chlorocarbonyl)cyclopropanecarboxylate. To a solution of methyl 1-(chlorocarbonyl)cyclopropanecarboxylate in DCM (2 mL) was added 4,4-difluoropiperidine/HCl (173 mg) and DIPEA (0.384 mL) at 0° C., and then the reaction mixture was allowed to warm to rt. The reaction mixture was purified by silica gel FCC to yield Cap P-20. 1H NMR (500 MHz, CDCl3) δ ppm 3.77-3.82 (2H, m), 3.75 (3H, s), 3.64 (2H, t, J=5.42 Hz), 1.96-2.09 (4H, m), 1.51-1.57 (2H, m), 1.33-1.39 (2H, m). Hydrolysis of methyl 1-(4,4-difluoropiperidine-1-carbonyl)cyclopropanecarboxylate (by 2 mL of 1N NaOH, 1 mL of THF and 1 mL of MeOH) to afford Cap P-20 as a white solid (194 mg). 1H NMR (500 MHz, CDCl3) δ ppm 3.78-3.73 (4H, m), 1.97-2.10 (4H, m), 1.59-1.65 (2H, m), 1.42-1.48 (2H, m).

1. custom(˜1 h)
2. customExcess oxalyl chloride and DCM were evaporated

ORD record

ord-c079ff1531e74fffa0c533a44088ce9b

Source dataset

uspto-grants-2016_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09326973B2