反应详情

To a solution of 5-(2,6-dichloro-4-nitro-phenoxy)-2-methoxy-benzaldehyde (3.0 g, 8.8 mmol) in a mixture of THF (50 ml), tert-butyl alcohol (50 ml) and 2-methyl-2-butene (11 ml, 132 mmol) was added dropwise a solution of sodium chlorite (7.1 g, 79 mmol) in potassium phosphate buffer (100 ml of a 0.6 M solution, 60 mmol). The resulting mixture was stirred vigorously for 16 h at RT then acidified with 1 M HCl (200 ml). The resulting mixture was extracted with EtOAC (3×150 ml). The combined EtOAc extracts were washed with 1 M HCl (2×250 ml), water (250 ml), 10% NaHSO3, and brine (250 ml). The extracts were dried (Na2SO4), filtered, and concentrated to give the title compound of Step B (3.1 g) as a yellow solid. The title product of Step B was used in the next step without further purification. MS (ES−) Calc.: 357.0, Found: 356.0 (M−1).

1. extractionThe resulting mixture was extracted with EtOAC (3×150 ml)
2. washThe combined EtOAc extracts were washed with 1 M HCl (2×250 ml), water (250 ml), 10% NaHSO3, and brine (250 ml)
3. dry with materialThe extracts were dried (Na2SO4)
4. filtrationfiltered
5. concentrationconcentrated