反应详情

To a solution of tert-butyl 5-aminopentylcarbamate 30a (20 g, 99 mmoles) and 2-nitrobenzene-1-sulfonyl chloride 30b (23 g, 1.05 eq) in DCM (200 mL) was added dropwise diisopropyl ethyl amine (19.2 g, 1.5 eq) at 0° C. After stirring at RT overnight, the RM was successively washed with an aqueous solution of citric acid, then brine, dried over magnesium sulfate, filtered and concentrated. Trituration in diisopropyl ether afforded 32.61 g (85% yield) of tert-butyl 5-(2-nitrophenylsulfonamido)pentylcarbamate 30c as a white solid; m/z 388 [M+H]+.

1. washthe RM was successively washed with an aqueous solution of citric acid
2. dry with materialbrine, dried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated