Reaktion #41148

Reaktionsgleichung

5-bromomethyl-1-tert-butyl-1H-pyrazole-4-carboxylic acid methyl ester

sodium ethoxide

ethanol

→

1-tert-butyl-5-ethoxymethyl-1H-pyrazole-4-carboxylic acid ethyl ester

Ausbeute 51.0%

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenAt this time, the reaction was concentrated in vacuo
2. 2
   SonstigeThe residue was partitioned between ethyl acetate (75 mL) and water (50 mL)
3. 3
   WaschenThe organics were washed with a saturated aqueous sodium bicarbonate solution (1×50 mL)
4. 4
   Trocknena saturated aqueous sodium chloride solution (1×50 mL), dried over magnesium sulfate
5. 5
   Filtrationfiltered
6. 6
   Einengenconcentrated in vacuo

Vorschrift

A solution of 5-bromomethyl-1-tert-butyl-1H-pyrazole-4-carboxylic acid methyl ester (220 mg, 0.79 mmol) in ethanol (4.0 mL, 0.2M) was treated with sodium ethoxide (65.4 mg, 0.96 mmol). The reaction mixture was warmed to 90° C. where it was stirred for 2.5 h. At this time, the reaction was concentrated in vacuo. The residue was partitioned between ethyl acetate (75 mL) and water (50 mL). The organics were washed with a saturated aqueous sodium bicarbonate solution (1×50 mL) and a saturated aqueous sodium chloride solution (1×50 mL), dried over magnesium sulfate, filtered and concentrated in vacuo to afford 1-tert-butyl-5-ethoxymethyl-1H-pyrazole-4-carboxylic acid ethyl ester (102.8 mg, 51%) as an orange oil. The material was used without further purification.

Quelle