反应详情

A suspension of 4-methoxy-3-nitro-N-(4-methanesulfonylamino-3-methoxyphenyl)benzamide (100 mg) in methanol (20 ml) was stirred under hydrogen with palladium on carbon (10%, 50 mg) for 18 hours. The solvents were removed in vacuo to give a brown gum. The residue was dissolved in pyridine (0.5 ml) and cooled to 0° C. when methanesulfonyl chloride (0.1 ml) was added, the mixture was kept at 0° C. for a further 30 minutes then brought to R.T. for 1 h. Dilute hydrochloric acid (10 ml, 1M) and dichloromethane were added, the organic layer separated, dried and evaporated in vacuo to give the product as a brown gum. Purification by column chromatography over silica gel eluting with dichloromethane containing ethyl acetate (0-100%) gave 3-methanesulfonylamino-4-methoxy-N-(3-methanesulfonylamino-4-methoxyphenyl)benzamide (65 mg, 56%) as a white solid.

1. customThe solvents were removed in vacuo
2. customto give a brown gum
3. additionwas added
4. waitthen brought to R.T. for 1 h
5. customthe organic layer separated
6. customdried
7. customevaporated in vacuo