Hydrochloric Acid → 1H-Indole-4-boronic acid

Temperature

0 °C

To a suspension of sodium hydride (130 mg, 5.41 mmol) in anhydrous tetrahydrofuran (20 mL) was added 4-bromoindole (973 mg, 4.96 mmol) (see Kosuge et al. supra) at 0° C. After 15 min. of stirring at 0° C., the reaction was cooled to −78° C., and tert-butyllithium (10.2 mmol, 1.7 M in hexane) (Aldrich) was added dropwise (a white precipitate immediately formed). After 10 min. tri-n-butylborate (2.75 mL, 10.2 mmol) (Aldrich) was added dropwise. The reaction was allowed to slowly warm to room temperature, then the suspension was poured into an ice cold solution of 1N HCl. The organic phase was separated, and the aqueous phase was washed with ether. The combined organic extracts were extracted with 1N NaOH (3×25 mL), and the combined alkaline extracts were acidified to pH 1 with 1N HCl. The product was then extracted with ether, and the combined ether layers were dried over magnesium sulfate and concentrated in vacuo to yield a brownish solid. The product was recrystallized from boiling water to yield 367 mg (46%) white crystals.

1. temperaturethe reaction was cooled to −78° C.
2. customimmediately formed)
3. temperatureto slowly warm to room temperature
4. customThe organic phase was separated
5. washthe aqueous phase was washed with ether
6. extractionThe combined organic extracts were extracted with 1N NaOH (3×25 mL)
7. extractionThe product was then extracted with ether
8. dry with materialthe combined ether layers were dried over magnesium sulfate
9. concentrationconcentrated in vacuo
10. customto yield a brownish solid
11. customThe product was recrystallized

ORD record

ord-99ff3931979e44e1948487fb7a1ab56b

Source dataset

uspto-grants-2001_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06307056B1