Tetrahydrofuran → 3-Tert-butyl-2-hydroxy-5-methylbenzaldehyde

2-tert-Butyl-4-methylphenol 9.68 g (58.93 mmol) and THF 100 ml were charged in a sufficiently dried 1 liter reactor purged with nitrogen, ethylmagnesium bromide 23.00 ml (an ether solution, 3.0N, 69.00 mmol) was added dropwise to the reactor at 0° C. in 30 minutes and after that, the resultant mixture was gradually heated to a room temperature and stirred for 1 hour at a room temperature. Toluene 100 ml was added, the resultant mixture was heated to 95° C., and the mixed solvents of the ether/THF were evaporated off to obtain a slightly opaque slurry. After the slurry was cooled to a room temperature, toluene 100 ml, p-formaldehyde 4.50 g (149.90 mmol) and triethylamine 12.50 ml (89.93 mmol) were added and the resultant mixture was stirred at 95° C. for 2 hour. After being cooled to a room temperature, the mixture was quenched with 300 ml of 1N hydrochloric acid and an organic layer was concentrated and purified by a silica gel column to obtain 3-tert-butyl-5-methylsalicylaldehyde 7.36 g (yield 65%).

1. custompurged with nitrogen, ethylmagnesium bromide 23.00 ml (an ether solution, 3.0N, 69.00 mmol)
2. additionwas added dropwise to the reactor at 0° C. in 30 minutes
3. additionToluene 100 ml was added
4. temperaturethe resultant mixture was heated to 95° C.
5. customthe mixed solvents of the ether/THF were evaporated off
6. customto obtain a slightly opaque slurry
7. temperatureAfter the slurry was cooled to a room temperature
8. temperatureAfter being cooled to a room temperature
9. customthe mixture was quenched with 300 ml of 1N hydrochloric acid
10. concentrationan organic layer was concentrated
11. custompurified by a silica gel column

ORD-Eintrag

ord-b22888416d454576a451f51418547c55

Quelldatensatz

uspto-grants-2009_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07563849B2