5-Bromo-2-chlorobenzoic acid → 5-bromo-2-chloro-N-cyclopropylbenzamide

To a suspension of 5-bromo-2-chlorobenzoic acid (17.6 g, 75 mmol) in CH2Cl2 (180 mL) was added oxalyl chloride (7.0 mL, 83 mmol). DMF (8 drops) was added, and the mixture was stirred for 2 h at rt (gas evolution). The mixture was reduced under reduced pressure, and the crude residue was diluted with CH2Cl2 (530 mL). The mixture was cooled to 0° C., and a sol. of cyclopropylamine (5.8 mL, 83 mmol) in CH2Cl2 (45 mL) was added dropwise. The mixture was stirred for 10 min at 0° C., and was allowed to warm to rt. DIPEA (14.3 mL, 84 mmol) was added, and the mixture was stirred for 2 h at rt. The mixture was diluted with more CH2Cl2, and was washed with aq. 10% HCl, water, and brine. The org. layer was dried over MgSO4, filtered, and the solvents were removed under reduced pressure. The residue was triturated with hexane, filtered, and dried under high vacuum to yield the title compound (19.3 g, 94%). LC-MS: tR=0.84 min; ES+: 316.89.

1. temperatureThe mixture was cooled to 0° C.
2. stirringThe mixture was stirred for 10 min at 0° C.
3. temperatureto warm to rt
4. stirringthe mixture was stirred for 2 h at rt
5. washwas washed with aq. 10% HCl, water, and brine
6. dry with materiallayer was dried over MgSO4
7. filtrationfiltered
8. customthe solvents were removed under reduced pressure
9. customThe residue was triturated with hexane
10. filtrationfiltered
11. customdried under high vacuum

ORD-Eintrag

ord-608d607d04c74495800824fbac261fa4

Quelldatensatz

uspto-grants-2010_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07799805B2