反应详情

The procedure of Example 1 is repeated using 4.31 g (25 mmol) of 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine, 7.73 g (75 mmol) of tert-butyl nitrite, 25 mg (0.25 mmol) of copper(II) flouride, 70 mL of pyridine and 5.61 g (32.5 mmol) of 4-chloro-2-nitroaniline at 70° C. The crude product obtained is purified by vacuum flash chromatography (70:30/heptane:ethyl acetate) to give 4.28 g of the title compound in 84.8% yield as a light yellow solid melting at 124-125.5° C. The structure is confirmed by 1Hnmr and elemental analysis.

1. customat 70° C
2. customThe crude product obtained
3. customis purified by vacuum flash chromatography (70:30/heptane:ethyl acetate)