Lawesson's reagent → (R)-5-(5-bromo-2-fluoro-phenyl)-5-methyl-morpholine-3-thione

Temperatur

70 °C

A pressure tube was charged with a solution of N—[(R)-1-(5-bromo-2-fluoro-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide (2.00 g, 6.9 mmol) in tetrahydrofuran (50 ml). The colorless solution was treated with Lawesson's reagent (2.81 g, 6.9 mmol) to give a yellow suspension. The tube was sealed and the mixture stirred at 70° C. overnight. For the workup, the reaction mixture was diluted with ethyl acetate (300 ml) and extracted with a saturated solution of sodium hydrogen carbonate (75 ml). The organic layer was washed with brine (2×80 ml). The combined aqueous layers were extracted with ethyl acetate (300 ml). The combined organic layers were dried over sodium sulphate and concentrated at reduced pressure. The (R)-5-(5-bromo-2-fluoro-phenyl)-5-methyl-morpholine-3-thione was obtained as a light yellow gum (1.93 g, 92% of theory) sufficiently pure to be engaged in the next step without further purification. MS (ISP): m/z=302.0 [M+H]+, 304.0 [M+2+H]+.

1. customto give a yellow suspension
2. customThe tube was sealed
3. extractionextracted with a saturated solution of sodium hydrogen carbonate (75 ml)
4. washThe organic layer was washed with brine (2×80 ml)
5. extractionThe combined aqueous layers were extracted with ethyl acetate (300 ml)
6. dry with materialThe combined organic layers were dried over sodium sulphate
7. concentrationconcentrated at reduced pressure

ORD-Eintrag

ord-bc8f1a1d0e2d419cb3d772527954be0a

Quelldatensatz

uspto-grants-2013_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08399459B2