Triethylamine → 4-[(2R)-2-(4-bromophenyl)-2-chloroethyl]morpholine

Temperature

0 °C

(1R)-1-(4-Bromophenyl)-2-(4-morpholinyl)ethanol (48.5 g, 0.17 mol) was dissolved in 200 mL CH2Cl2 at room temperature with magnetic stirring and triethylamine (52 mL. 0.37 mol, 2.2 equiv) was added. The resulting solution was cooled to 0° C. and treated with methanesulfonyl chloride (16 mL, 0.20 mol, 1.2 equiv) through an addition funnel. After the addition, the reaction mixture was maintained at 40° C. for 48 h with magnetic stirring. The reaction mixture was concentrated and the residue was partitioned between EtOAc and saturated aqueous NaHCO3. The organic layer was washed with brine, dried over MgSO4, filtered and concentrated. The crude brown oil was purified by silica gel chromatography (800 g silica gel 60, 230-400 mesh, 5% EtOAc/CH2Cl2 as eluent). Concentration of the pure fractions yielded the title compound as a yellow oil (34.5 g, 67%). MS (ES) m/e 304 [M+H]−.

1. additionAfter the addition
2. temperaturethe reaction mixture was maintained at 40° C. for 48 h with magnetic stirring
3. concentrationThe reaction mixture was concentrated
4. customthe residue was partitioned between EtOAc and saturated aqueous NaHCO3
5. washThe organic layer was washed with brine
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated
9. customThe crude brown oil was purified by silica gel chromatography (800 g silica gel 60, 230-400 mesh, 5% EtOAc/CH2Cl2 as eluent)

ORD record

ord-1b0750e466a04698a7b5494e48c18cb9

Source dataset

uspto-grants-2008_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07432258B2