Methanol → 4-Hydroxymethyl-3-nitrobenzoic acid

Temperature

0 °C

To a suspension of 1-methyl-2-nitroterephthalate (10.2 g, 45.1 mmol) and 150 mL of anhydrous ether was added 5.2 mL of anhydrous MeOH at which point most of the solid went into solution. The solution was cooled to 0° C. and LiBH4 (in THF, 57.0 mL, 114.0 mmol, Aldrich) was added slowly over 50 min. Bubbles were generated. The resulting mixture was stirred at RT for 5 h, then heated to 35° C. TLC showed ˜20% conversion. 100 mL of anhydrous THF was added and the reaction was heated to 55° C. After 3 days, TLC showed reactions to be complete. The reaction was carefully quenched with the addition of H2O, and neutralized with 1N HCl. The organic layer was separated and the aqueous layer was extracted with ether (3×). The combined organic layers were washed with brine, dried over MgSO4, and concentrated in vacuo to give a light yellow solid. MS m/z: 196.1 (M−1).

1. temperatureheated to 35° C
2. temperaturethe reaction was heated to 55° C
3. waitAfter 3 days
4. customThe reaction was carefully quenched with the addition of H2O
5. customThe organic layer was separated
6. extractionthe aqueous layer was extracted with ether (3×)
7. washThe combined organic layers were washed with brine
8. dry with materialdried over MgSO4
9. concentrationconcentrated in vacuo
10. customto give a light yellow solid

ORD record

ord-d3febffd7e8e43c984db81e35aa36d14

Source dataset

uspto-grants-2004_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06822097B1