反应详情

To a solution of 5-nitro-2-(spiro[1-benzofuran-3,1′-cyclopropan]-4-yloxy)pyridine (Intermediate 86, 99 mg) in tetrahydrofuran (5 ml)/water (2.5 ml) iron (97 mg, 1.741 mmol) and then ammonium chloride (93 mg, 1.741 mmol) were added and the reaction mixture was stirred for 4 hours at room temperature. The catalyst was filtered off and the residue was diluted with an aqueous saturated solution of NaHCO3 (5 ml) and extracted with ethyl acetate (3×10 ml). The organic layer was dried over sodium sulphate, filtered and evaporated and the residue was purified by flash chromatography (Biotage system) on silica gel using a 10 g SNAP column and cyclohexane/ethyl acetate 8:2 to cyclohexane/ethyl acetate 1:1 as eluents affording the title compound as a light yellow solid (85 mg).

1. filtrationThe catalyst was filtered off
2. additionthe residue was diluted with an aqueous saturated solution of NaHCO3 (5 ml)
3. extractionextracted with ethyl acetate (3×10 ml)
4. dry with materialThe organic layer was dried over sodium sulphate
5. filtrationfiltered
6. customevaporated
7. customthe residue was purified by flash chromatography (Biotage system) on silica gel using a 10 g SNAP column and cyclohexane/ethyl acetate 8:2 to cyclohexane/ethyl acetate 1:1 as eluents