Dimethylamine, hydrochloride → 4-Amino-3-chloro-N,N-dimethylbenzamide

DIPEA (116 mL, 699.5 mmol) was added into a suspension of dimethylamine hydrochloride (28.51 g, 349.6 mmol) in THF (600 mL). The mixture was stirred at room temperature for 0.5 h. Then 4-amino-3-chlorobenzoic acid (30.00 g, 174.8 mmol) and HATU (86.41 g, 227.2 mmol) were added into the above suspension separately. The reaction mixture was continued to be stirred for 1.5 h. Then it was concentrated and the residue was partitioned between EtOAc (300 mL) and water (150 mL). The separated organic phase was washed with water, dried over Na2SO4 and evaporated in vacuum. The crude product was purified by silica gel chromatography, eluted with Hexanes: EtOAc=1:1 to afford 4-amino-3-chloro-N,N-dimethylbenzamide (34.72 g, yield: 89%). ESI-MS: 199.06. 1H NMR (CDCl3, 400 MHz): δ7.39 (s, 1H, ArH), 7.19 (d, J=8.4 Hz, 1H, ArH), 6.74 (d, J=8.4 Hz, 1H, ArH), 4.24 (br, 2H, NH2), 3.05 (s, 6H, 2CH3).

1. stirringto be stirred for 1.5 h
2. concentrationThen it was concentrated
3. customthe residue was partitioned between EtOAc (300 mL) and water (150 mL)
4. washThe separated organic phase was washed with water
5. dry with materialdried over Na2SO4
6. customevaporated in vacuum
7. customThe crude product was purified by silica gel chromatography
8. washeluted with Hexanes

ORD-Eintrag

ord-0c04d74dc3b6421698a8649bd9bf92cf

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08846762B2