反应详情

To a solution of 2(R)-(4-methoxybenzenesulfonylamino)-3-methylbutyric acid tert-butyl ester (0.15 g, 0.44 mmol) and potassium carbonate (0.32 g, 2.32 mmol) in dry dimethylformamide (15 mL) was added 3-nitro-4-methylbenzyl chloride (81.1 mg. 0.44 mmol). The reaction mixture was stirred overnight and then concentrated on the rotoevaporator. The residue was dissolved in a 1:1 ethyl acetate and brine (50 mL). The organic phase was isolated, dried over magnesium sulfate, and concentrated to give 2(R)-[(3-nitro-4-methylbenzyl)-(4-methoxybenzenesulfonyl)amino]-3-methylbutyric acid tert-butyl ester (0.196 g) as a yellow viscous oil which was converted to 2(R)-[(3-nitro-4-methylbenzyl)-(4-methoxy-benzenesulfonyl)amino]-3-methylbutyric acid by following the procedure described in Example 10, Step 8 below. 2(R)-[(3-nitro-4-methylbenzyl)-(4-methoxybenzenesulfonyl)-amino]-3-methylbutyric acid is then converted to N-hydroxy-2(R)-[(3-nitro-4-methylbenzyl)-(4-methoxybenzenesulfonyl)amino]-3-methylbutyramide by following Example 1, Steps 6 and 7 above.

1. concentrationconcentrated on the rotoevaporator
2. dissolutionThe residue was dissolved in a 1:1 ethyl acetate and brine (50 mL)
3. customThe organic phase was isolated
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated