Cyclohexane → (2,2-Difluoro-1,3-dioxaindan-4-yl)boronic acid

Temperature

-78 °C

2,2-Difluoro-1,3-benzodioxole (960 mg, 6.1 mmol) was dissolved in THF (8 mL) and cyclohexane (4 mL) and the resulting solution cooled to −78° C. sec-BuLi 1.4M solution in cyclohexane (4.3 mL, 6.1 mmol) was added dropwise and the reaction mixture stirred for 1.5 hours at −78° C. Trimethylborate (694 mg, 6.75 mmol) was added and the mixture was allowed to warm slowly to −30° C. The reaction mixture was quenched with a 2N solution of HCl and diluted with ethyl acetate. Two phases were separated and the organic layer was washed twice with brine, dried over Na2SO4 and evaporated to dryness affording the title compound as yellow oil which was used in the next step without further purification.

1. additionwas added dropwise
2. temperatureto warm slowly to −30° C
3. customThe reaction mixture was quenched with a 2N solution of HCl
4. additiondiluted with ethyl acetate
5. customTwo phases were separated
6. washthe organic layer was washed twice with brine
7. dry with materialdried over Na2SO4
8. customevaporated to dryness

ORD record

ord-a2ccac20af1f40b4b059b009fb0ed6d5

Source dataset

uspto-grants-2015_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09133175B2