Bromine → Ethyl 3-bromo-2-oxocyclohexanecarboxylate

To a solution of ethyl 2-oxocyclohexanecarboxylate (50 g, 0.29 mol) in CHCl3 (150 mL) there was slowly added bromine (47 g, 0.29 mol) at 0° C. under a blanket of nitrogen as inert gas dropwise over a period of 45 minutes and the resultant mixture was stirred for a period of 6 hours at 0° C. and then for 16 hours at room temperature. Air was then passed into the reaction solution over a period of 2 hours. The organic phase was washed with aqueous saturated NaHCO3 solution (2×15 mL) and aqueous saturated NaCl solution (3×20 mL). Following drying of the organic phase over Na2SO4 and filtration, the solvent was removed. The product ethyl 3-bromo-2-oxocyclohexanecarboxylate was obtained in a yield of 72.6 g (corresponding to 99% of theory).

1. customat 0° C.
2. customof 45 minutes
3. waitAir was then passed into the reaction solution over a period of 2 hours
4. washThe organic phase was washed with aqueous saturated NaHCO3 solution (2×15 mL) and aqueous saturated NaCl solution (3×20 mL)
5. dry with materialFollowing drying of the organic phase over Na2SO4 and filtration
6. customthe solvent was removed

ORD-Eintrag

ord-0ef8df6ab1f342108347979d946b8734

Quelldatensatz

uspto-grants-2008_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07348347B2