반응 #429145

반응 방정식

water

N-Chlorocarbonyl-2-chloro-1,4,5,6-tetrahydro-pyridine

formic acid N'-(2,4-dichloro-5-(2-propinyloxy)-phenyl) hydrazide

triethylamine

→

2-[2,4-Dichloro-5-(2-propynyloxy)phenyl]-5,6,7,8-tetrahydro-1,2,4-triazolo[4,3-a]pyridine-3(2H) -one

용매

acetonitrile

acetonitrile

acetonitrile

반응 조건

후처리

1. 1
   기타a colourless precipitate precipitates out
2. 2
   온도This is heated for 4 hours to 50°-55° C.
3. 3
   workup.STIRRINGstirred for one night at room temperature
4. 4
   기타The batch is reacted with 30 ml 6N hydrochloric acid
5. 5
   workup.STIRRINGstirred for 1 hour at 50° C
6. 6
   기타The resultant pale grey precipitate is separated by filtration
7. 7
   세척washed with water
8. 8
   기타dried at 50°-60° C

실험 절차

N-Chlorocarbonyl-2-chloro-1,4,5,6-tetrahydro-pyridine (4.32 g, 0.024 mol) dissolved in 20 ml acetonitrile are added to a stirred suspension of formic acid N'-(2,4-dichloro-5-(2-propinyloxy)-phenyl) hydrazide (5.18 g, 0.02 mol) in 250 ml acetonitrile at 0°-10° C. for 20 minutes. This is then reacted at the same temperature with triethylamine (4.04 g, 0.04 mol) and dissolved in 20 ml acetonitrile. This is stirred for one hour at 5°-10° C. and a colourless precipitate precipitates out. This is heated for 4 hours to 50°-55° C. and then stirred for one night at room temperature. The batch is reacted with 30 ml 6N hydrochloric acid and stirred for 1 hour at 50° C. The solvent is drawn off under reduced pressure and the residue digested with iced water. The resultant pale grey precipitate is separated by filtration, washed with water and dried at 50°-60° C. Yield: 6.6 g (=97.6%) Melting point: 160°-162° C.

출처