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

Temperatur

-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-Eintrag

ord-9b977c4d3d2f4c658ba4fe05df90ca95

Quelldatensatz

uspto-grants-2016_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09422272B2