反应详情

The nitro compound prepared in step c above (3.91 g, 10 mol) was dissolved in ethyl acetate (50 ml) and tin (II) chloride dihydrate (11.27 g, 50 mmol) was added and the mixture stirred and heated at 70° under an atmosphere of nitrogen for 1 h . The mixture was poured carefully onto 5% sodium hydrogencarbonate solution (200 ml) and a further aliquot of ethyl acetate (100 ml) was added. After shaking the organic layer was separated and the aqueous layer was extracted with more ethyl acetate (50 ml). The combined organic layers were washed with brine, and dried, filtered and evaporated to leave a pale yellow solid (3.25 g, 90%).

1. temperatureheated at 70° under an atmosphere of nitrogen for 1 h
2. stirringAfter shaking the organic layer
3. customwas separated
4. extractionthe aqueous layer was extracted with more ethyl acetate (50 ml)
5. washThe combined organic layers were washed with brine
6. customdried
7. filtrationfiltered
8. customevaporated