Ammonium Chloride → Methanesulfonic acid 3-(4-bromo-2-methyl-phenyl)-4-tert-butoxycarbonylamino-butyl ester

HRID 503910Notes

Reaction equation

[S:1](Cl)([CH3:4])(=[O:3])=[O:2].[C:6]([O:10][C:11](=[O:26])[NH:12][CH2:13][CH:14]([C:18]1[CH:23]=[CH:22][C:21]([Br:24])=[CH:20][C:19]=1[CH3:25])[CH2:15][CH2:16][OH:17])([CH3:9])([CH3:8])[CH3:7].[NH4+].[Cl-]>C(Cl)Cl>[Br:24][C:21]1[CH:22]=[CH:23][C:18]([CH:14]([CH2:13][NH:12][C:11]([O:10][C:6]([CH3:8])([CH3:9])[CH3:7])=[O:26])[CH2:15][CH2:16][O:17][S:1]([CH3:4])(=[O:3])=[O:2])=[C:19]([CH3:25])[CH:20]=1

Participants

Conditions

Temperature: -78 °C

Procedure

Mesyl chloride (7.53 mL, 0.09726 mol) was added, at −78° C., to a solution of [2-(4-bromo-2-methyl-phenyl)-4-hydroxy-butyl]-carbamic acid tert-butyl ester (30.3 g, 0.08457 mol) in DCM (600 mL) followed by TEA (27 mL, 0.1945 mol). The reaction mixture was stirred at −78° C. for 1 hour, then allowed to reach room temperature with stirring for an additional hour. A saturated aqueous solution of NH4Cl was added, and the resulting mixture was extracted with DCM. The combined organic extracts were dried over MgSO4, filtered, and evaporated under reduced pressure to give methanesulfonic acid 3-(4-bromo-2-methyl-phenyl)-4-tert-butoxycarbonylamino-butyl ester, which was used without further purification.

Workup

customto reach room temperature
stirringwith stirring for an additional hour
extractionthe resulting mixture was extracted with DCM
dry with materialThe combined organic extracts were dried over MgSO4
filtrationfiltered
customevaporated under reduced pressure

Sources & evidence

ORD record: ord-102b2e1bb456495982465ca71248e3b6
Source dataset: uspto-grants-2010_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07776910B2

Reaction notes

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