Dimethylformamide → 2-Chlorocyclohex-1-enecarbaldehyde

Phosphoryl trichloride (125 g, 815 mmol) was added dropwise into a flame-dried bottom flask containing N,N-dimethylformamide (74.5 g, 1019 mmol) at 0° C. with stirring. After addition, the mixture was warmed to ambient temperature for 30 min, and re-cooled to 0° C. before the dropwise addition of cyclohexanone (50 g, 509 mmol). The mixture was warmed to room temperature for 12 h. The reaction was poured over ice and quenched with NaHCO3. Once neutralized, the mixture was extracted with ethyl acetate (100 mL×3) and washed with water and brine. The organic phase was dried, filtered, and concentrated to afford the product (160 g, 87% yield). 1H NMR: (CDCl3, 400 MHz) δ 1.74˜1.75 (m, 2H), 1.76˜1.78 (m, 2H), 2.24˜2.27 (m, 2H), 2.53˜2.59 (m, 2H), 7.25 (s, 1H).

1. additionAfter addition
2. temperatureThe mixture was warmed to room temperature for 12 h
3. additionThe reaction was poured over ice
4. customquenched with NaHCO3
5. extractionthe mixture was extracted with ethyl acetate (100 mL×3)
6. washwashed with water and brine
7. customThe organic phase was dried
8. filtrationfiltered
9. concentrationconcentrated

ORD record

ord-fdaa50e9f14e472f8cf7bd47ad71bf65

Source dataset

uspto-grants-2015_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09012642B2