反应 #950179

反应方程式

water

sodium acetate

4,5,6,7-tetrahydro-4-oxo-3-benzofurancarboxylic acid

hydroxylamine hydrochloride

→

desired product

收率 95.4%

(Z)-4,5,6,7-Tetrahydro-4-(hydroxyimino)-3-benzofurancarboxylic acid

收率 95.4%

溶剂

ethanol

反应条件

后处理

1. 1
   温度The reaction mixture is heated
2. 2
   温度at reflux for 2.5 hours
3. 3
   浓缩concentrated in vacuo to a residue which
4. 4
   workup.ADDITIONis diluted with 600 ml of ethyl acetate
5. 5
   洗涤washed with 2×200 ml of water, brine
6. 6
   干燥dried over Na2SO4
7. 7
   浓缩The organic layer is concentrated in vacuo to a residue which
8. 8
   其他is dried under vacuum

实验过程

To a solution of 30.0 g of 4,5,6,7-tetrahydro-4-oxo-3-benzofurancarboxylic acid in 225 ml of ethanol is added 22.97 g of hydroxylamine hydrochloride, followed by 18.10 g of sodium acetate and 55 ml of water. The reaction mixture is heated at reflux for 2.5 hours and concentrated in vacuo to a residue which is diluted with 600 ml of ethyl acetate, washed with 2×200 ml of water, brine and dried over Na2SO4. The organic layer is concentrated in vacuo to a residue which is dried under vacuum to give 31.0 g of the desired product as a solid.

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