Phosphorus oxychloride → 5-Chloro-7-(2-chloro-4-pyridyl)-8-(3-(trifluoromethyl)phenyl)-1,2,4-triazolo[4,3-c]pyrimidine

HRID 897403Notes

Reaction equation

HRID 897403 reaction equation
O[C:2]1[N:7]2[CH:8]=[N:9][N:10]=[C:6]2[C:5]([C:11]2[CH:16]=[CH:15][CH:14]=[C:13]([C:17]([F:20])([F:19])[F:18])[CH:12]=2)=[C:4]([C:21]2[CH:26]=[CH:25][N:24]=[C:23]([Cl:27])[CH:22]=2)[N:3]=1.O=P(Cl)(Cl)[Cl:30].C(N(C(C)C)CC)(C)C>CCOC(C)=O>[Cl:30][C:2]1[N:7]2[CH:8]=[N:9][N:10]=[C:6]2[C:5]([C:11]2[CH:16]=[CH:15][CH:14]=[C:13]([C:17]([F:20])([F:19])[F:18])[CH:12]=2)=[C:4]([C:21]2[CH:26]=[CH:25][N:24]=[C:23]([Cl:27])[CH:22]=2)[N:3]=1

Participants

5

Reactant 3

HCID 24813Phosphorus oxychlorideHCID 81531DiisopropylethylamineHCID 178517542HCID 178517542, compound

Product 1

HCID 223466035-Chloro-7-(2-chloro-4-pyridyl)-8-(3-(trifluoromethyl)phenyl)-1,2,4-triazolo[4,3-c]pyrimidine

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

5-hydroxy-7-(2-chloro-4-pyridyl)-8-(3-(trifluoromethyl)phenyl)-1,2,4-triazolo[4,3-c]pyrimidine (0.3 g, 0.76 mmol), POCl3 (0.459 g, 3 mmol), and diisopropylethylamine (0.387 g, 3 mmol) in a 50-ml r.b.flask with a stir bar was stirred at 120° C. overnight. The reaction solution was cooled to room temperature and 20 ml of EtOAc and 5 g of SiO2 gel were added into the cooled solution. The solvents were evaporated in vacuo at 40° C. The resulting brown solid was placed on a cake of SiO2 gel (˜20 g) and washed with 250 ml of EtOAc. The brown filtrate was evaporated in vacuo to give 5-chloro-7-(2-chloro-4-pyridyl)-8-(3-(trifluoromethyl)phenyl)-1,2,4-triazolo[4,3-c]pyrimidine; MS m/z (M)+ 410; C17H8Cl2F3N5 requir. 410.2.

Workup

  1. customThe solvents were evaporated in vacuo at 40° C
  2. washwashed with 250 ml of EtOAc
  3. customThe brown filtrate was evaporated in vacuo

Sources & evidence

ORD record
ord-83742532eb344dadbf99e322cd1f1ad6
Source dataset
uspto-grants-2005_07
Patent number
US06921762B2

Reaction notes

Loading…