Ethanol → 2-(3,3-Difluoro-1-methylcyclobutyl)acetic acid

Temperature

90 °C

To a solution of Intermediate 229C (100 mg, 0.689 mmol) in ethanol (1 mL) and H2O (1 mL) was added a 10% aq. solution of NaOH (2 mL, 0.689 mmol) and the reaction mixture was stirred at 90° C. for 12 h. The reaction mixture was concentrated and the pH of the residue was adjusted to 4 with an aqueous solution of 1.5 N HCl, and the compound was extracted with EtOAc (3×10 mL). The combined organic layer was dried on Na2SO4, filtered and the filtrate evaporated under reduced pressure to afford Intermediate 229D as a yellow sticky liquid (80 mg, 71%). The crude intermediate was taken as such for further reaction without purification. 1H NMR (400 MHz, DMSO-d6) δ ppm 12.14 (brs, 1H), 2.11-2.39 (m, 6H), 1.15 (s, 3H).

1. concentrationThe reaction mixture was concentrated
2. extractionthe compound was extracted with EtOAc (3×10 mL)
3. customThe combined organic layer was dried on Na2SO4
4. filtrationfiltered
5. customthe filtrate evaporated under reduced pressure

ORD record

ord-6068457c874c421c8fd7393eae6b48bf

Source dataset

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09273058B2