Water → (1H-indol-5-yl)methanol

To a mechanically stirred solution of indole-5-carboxylic acid (26.3 g, 163 mmol) in tetrahydrofuran (600 mL), was added a solution of lithium aluminium hydride 1.0M in tetrahydrofuran (200 mL, 200 mmol) drop wise at ambient temperature. A solution of lithium aluminium hydride 2.0M in tetrahydrofuran (22 mL, 44 mmol) was added drop wise at ambient temperature, and then the reaction mixture was carefully heated up to reflux and held there for 1 hour. The reaction mixture was cooled to ambient temperature and then water (13 mL) was added drop wise, followed by an aqueous 10% sodium hydroxide solution (13 mL), and water (20 mL). The suspension was stirred at ambient temperature for 30 minutes, filtered through a bed of celite and the filter cake washed with ethyl acetate (2×200 mL). The filtrate and the washings were combined and the organics were separated, dried (Na2SO4) and concentrated in vacuo, to give a dark red oil. The resultant crude product was suspended in hexane (200 mL), and ethyl acetate (10 mL) was added. This mixture was stirred at ambient temperature for 18 hours, and the solids were separated via filtration and washed with hexane to afford the title compound as a light brown solid, 22.25 g, 93%.

1. temperaturethe reaction mixture was carefully heated up
2. temperatureto reflux
3. filtrationfiltered through a bed of celite
4. washthe filter cake washed with ethyl acetate (2×200 mL)
5. customthe organics were separated
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated in vacuo
8. customto give a dark red oil
9. stirringThis mixture was stirred at ambient temperature for 18 hours
10. customthe solids were separated via filtration
11. washwashed with hexane

ORD record

ord-85f8d74c47ef41e8994abc5494802db6

Source dataset

uspto-grants-2014_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08916591B2