4-Toluenesulfonyl chloride → tert-butyl N-{2-[(4-methylbenzenesulfonyl)oxy]ethyl}carbamate

HRID 355722Notes

Reaction equation

[C:1]([O:5][C:6]([NH:8][CH2:9][CH2:10][OH:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].C(N(CC)CC)C.[C:19]1([CH3:29])[CH:24]=[CH:23][C:22]([S:25](Cl)(=[O:27])=[O:26])=[CH:21][CH:20]=1>CN(C)C1C=CN=CC=1.ClCCl>[C:19]1([CH3:29])[CH:24]=[CH:23][C:22]([S:25]([O:11][CH2:10][CH2:9][NH:8][C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])(=[O:27])=[O:26])=[CH:21][CH:20]=1

Participants

Conditions

Temperature: 0 °C

Procedure

A mixture of 2-tert-butoxycarbonylaminoethanol (32.7 g, 203 mmol), triethylamine (34 ml), p-toluenesulfonyl chloride (38.7 g, 203 mmol), 4-dimethylaminopyridine (0.10 g) and dichloromethane (500 ml) was stirred at 0° C. for 4 hours. The reaction mixture was washed successively with water, 1N hydrochloric acid, a saturated aqueous sodium hydrogencarbonate solution and a saturated aqueous sodium chloride solution. The organic layer was dried over anhydrous magnesium sulfate and the solvent was distilled off under reduced pressure. The resulting residue was purified by a silica gel column chromatography (eluent:ethyl acetate/n-hexane= 1/5) to obtain 48.2 g of 2-tert-butoxycarbonylaminoethyl 4-toluenesulfonate.

Workup

washThe reaction mixture was washed successively with water, 1N hydrochloric acid
dry with materialThe organic layer was dried over anhydrous magnesium sulfate
distillationthe solvent was distilled off under reduced pressure
customThe resulting residue was purified by a silica gel column chromatography (eluent:ethyl acetate/n-hexane= 1/5)

Sources & evidence

ORD record: ord-bf12f3b50a164b19a4db0521283fab08
Source dataset: uspto-grants-1998_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05834454

Reaction notes

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