Reacción #46218

Ecuación de reacción

LAH

2,2,4,4-tetrafluoro-4H-benzo[1,3]dioxine-6-carboxylic acid methyl ester

water

NaOH

→

(2,2,4,4-tetrafluoro-4H-benzo[1,3]dioxin-6-yl)-methanol

Rendimiento 96.8%

Disolventes

THF

THF

Condiciones de reacción

Tratamiento posterior

1. 1
   FiltraciónThe slurry was filtered
2. 2
   Lavadowashed with THF
3. 3
   OtroThe combined filtrates were evaporated to dryness

Procedimiento

To a suspension of LAH (2.14 g, 56.4 mmol) in dry THF (200 mL) was added dropwise a solution of 2,2,4,4-tetrafluoro-4H-benzo[1,3]dioxine-6-carboxylic acid methyl ester (7.50 g, 28.2 mmol) in dry THF (50 mL) at 0° C. After being stirred at 0° C. for 1 h, the reaction mixture was treated with water (2.14 g) and 10% NaOH (2.14 mL). The slurry was filtered and washed with THF. The combined filtrates were evaporated to dryness to give the crude (2,2,4,4-tetrafluoro-4H-benzo[1,3]dioxin-6-yl)-methanol (6.5 g), which was used directly in the next step. 1H NMR (CDCl3, 300 MHz) δ 7.64 (s, 1H), 7.57-7.60 (m, 1H), 7.58 (d, J=8.7 Hz, 1H), 4.75 (s, 2H).

Fuente