Methanol → 5-(3-Bromophenyl)-5-methylmorpholin-3-one

A solution of (RS)-N-[1-(3-bromo-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide (5.36 g, 17 mmol) in 2-methyl-2-butanol (100 ml) was treated in one portion with potassium tent-butylate (6.66 g, 58 mmol). Initially, the temperature rose to 30° C.; the reaction mixture was left to cool to room temperature and stirring was continued for one hour. For the workup, the reaction mixture was treated with methanol (50 ml), then evaporated at reduced pressure. The residue was purified by chromatography on silica gel using a gradient of dichloromethane/methanol=100/0 to 75/25 as the eluent. There were obtained 4.18 g (88% of theory) of (RS)-5-(3-bromo-phenyl)-5-methyl-morpholin-3-one as a white solid. Mass (calculated) C11H12BrNO2 [270.128]; (found) [M+H]+=270, [M+2-H]+==272.

1. customrose to 30° C.
2. waitthe reaction mixture was left
3. customevaporated at reduced pressure
4. customThe residue was purified by chromatography on silica gel using a gradient of dichloromethane/methanol=100/0 to 75/25 as the eluent

ORD-Eintrag

ord-4b4d45f8e75542c4ab3273f779f65774

Quelldatensatz

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08188079B2