反应详情

To a stirred solution of O-allylhydroxylamine hydrochloride (147.05 g, 1341.59 mmol) in DCM (2.5 L) at 0° C., pyridine (318 mL, 3948 mmol) was added followed by the addition of 2-nitrobenzene-1-sulfonyl chloride (250 g, 1128.05 mmol) portionwise as a solid. The reaction mixture was then stirred at the same temperature for 1 h. Completion of the reaction was monitored by TLC. The reaction mixture was quenched with 1.5 N HCl (1 L). The organic layer was separated, washed with water (250 mL), brine (250 mL), dried over anhydrous Na2SO4, filtered and concentrated under vacuum to yield the residue. The crude was purified by crystallization using EtOAc:petroleum ether (1:3) (800 mL) and afforded 202 g of the title compound as a light brown solid. The mother liquor was concentrated and purified by silica gel column chromatography (mesh 60-120) using petroleum ether:EtOAc (7:3) to yield another 19.1 g of the title compound as a yellow solid. The total yield is 76%.

1. customThe reaction mixture was quenched with 1.5 N HCl (1 L)
2. customThe organic layer was separated
3. washwashed with water (250 mL), brine (250 mL)
4. dry with materialdried over anhydrous Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under vacuum
7. customto yield the residue
8. customThe crude was purified by crystallization