Hydrochloric Acid → 3-[(Ethyloxy)methyl]-1-(1-methylethyl)-1H-pyrazol-5-amine

To a 25 mL round bottom was added 4-(ethyloxy)-3-oxobutanenitrile (550 mg, 4.33 mmol), isopropyl hydrazine hydrochloride (478 mg, 4.33 mmol), and HCl (2.163 mL, 4.33 mmol) in Ethanol (10 mL). The reaction mixture was stirred at the room temperature overnight. The reaction mixture was then evaporated, and partitioned between 20 mL of ethyl acetate and 20 mL of 1 M Na2CO3. The organic layer was washed with brine, filtered and evaporated. 3-[(Ethyloxy)methyl]-1-(1-methylethyl)-1H-pyrazol-5-amine (520 mg, 2.84 mmol, 65.6% yield) was isolated as yellow oil. The product was used in the next step without further purification. 1H NMR (400 MHz, DMSO-d6) ppm 1.09 (t, J=7.07 Hz, 3 H) 1.26 (d, J=6.57 Hz, 6 H) 3.40 (q, J=6.91 Hz, 2 H) 4.16 (s, 2 H) 4.32 (quin, J=6.57 Hz, 1 H) 5.06 (s, 2 H) 5.22 (s, 1 H)

1. customThe reaction mixture was then evaporated
2. custompartitioned between 20 mL of ethyl acetate and 20 mL of 1 M Na2CO3
3. washThe organic layer was washed with brine
4. filtrationfiltered
5. customevaporated

ORDレコード

ord-939fca259526463da317d6465f6dac9e

出典データセット

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US09446034B2