Hydrochloric Acid → 2-Hydroxy-5-nitrobenzyl alcohol

Temperatur

15 °C

To a BH3.THF solution (110 mL, 1M, 110 mmoles) was added dropwise a solution of 5-nitro-salicylic acid (10.0 g, 54.6 mmoles) in 930 mL THF. After a few milliliters, the reaction mixture was cooled with ice to maintain a temperature of about 15° C. The clear brown solution was warmed to room temperature and stirred for an additional 7 hours. During this time a precipitate formed. BH3.THF (20 ml, 20 mmoles) was added and stirring was continued overnight. The mixture was cooled to 5° C. and carefully hydrolyzed with 1 M HCl (100 mL). Methyl tert-butyl ether (MTBE) (100 mL) was added, the phases were separated and the aqueous layer was extracted with MTBE (2×70 mL). The combined organic layers were dried over MgSO4 (10 g), filtered and evaporated to give 10.5 g of a pale ochre solid. This solid was recrystallized from 65 mL toluene to give 7.033 g (76%) of 2-hydroxymethyl-4-nitrophenol as a pale ochre solid.

1. temperatureAfter a few milliliters, the reaction mixture was cooled with ice
2. temperatureThe clear brown solution was warmed to room temperature
3. customDuring this time a precipitate formed
4. stirringstirring
5. waitwas continued overnight
6. temperatureThe mixture was cooled to 5° C.
7. customthe phases were separated
8. extractionthe aqueous layer was extracted with MTBE (2×70 mL)
9. dry with materialThe combined organic layers were dried over MgSO4 (10 g)
10. filtrationfiltered
11. customevaporated
12. customto give 10.5 g of a pale ochre solid
13. customThis solid was recrystallized from 65 mL toluene

ORD-Eintrag

ord-ede864559add4d528c4b986ca65895a1

Quelldatensatz

uspto-grants-2005_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06855833B2