Ammonium Chloride → Ethyl 4-([1,1'-biphenyl]-2-yl)-4-(1,1-dimethylethylsulfinamido)-2-methylbutanoate

Temperatur

-78 °C

A cooled (−78° C.) solution of commercially available 2-iodo-1,1′-biphenyl (680 mg; 2.43 mmol) in anh. THF (20 ml), under nitrogen, was treated dropwise with a solution of 1.6 M n-BuLi in hexanes (1.52 ml; 2.43 mmol). The resulting solution was further stirred at −78° C. for 10 min. A solution of ethyl 4-((tert-butylsulfinyl)imino)-2-methylbutanoate (600 mg; 2.43 mmol) in anh. THF (5 ml) was added to the cooled reaction mixture, and stirring was continued from −78° C. to 0° C. over 1 h. The resulting reaction mixture was treated successively with aq. sat. NH4Cl (80 ml), Et2O (250 ml) and water (75 ml). The separated organic layer was then washed with brine (75 ml), dried over anh. MgSO4, filtered, and concentrated to dryness under reduced pressure. Purification by FC (DCM/MeOH=25/1) afforded ethyl 4-([1,1′-biphenyl]-2-yl)-4-(1,1-dimethylethylsulfinamido)-2-methylbutanoate as a mixture of stereoisomers. LC-MS (conditions A): tR=0.93 min.; [M+H]+: 401.79 g/mol and tR=0.94 min.; [M+H]+: 401.80 g/mol.

1. stirringstirring
2. waitwas continued from −78° C. to 0° C. over 1 h
3. customThe resulting reaction mixture
4. washThe separated organic layer was then washed with brine (75 ml)
5. dry with materialdried over anh. MgSO4
6. filtrationfiltered
7. concentrationconcentrated to dryness under reduced pressure
8. customPurification by FC (DCM/MeOH=25/1)

ORD-Eintrag

ord-0c7c69b30ca541d0b2616f5e0b8a8fda

Quelldatensatz

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09242970B2