Propionitrile → 3-Cyano-2-(2,4-dichlorophenyl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol

HRID 728333Notes

Reaction equation

HRID 728333 reaction equation
[C:1](#[N:4])[CH2:2][CH3:3].C([Li])CCC.[N:10]1([CH2:15][C:16]([C:18]2[CH:23]=[CH:22][C:21]([Cl:24])=[CH:20][C:19]=2[Cl:25])=[O:17])[CH:14]=[N:13][CH:12]=[N:11]1.C(=O)(O)[O-].[Na+]>O1CCCC1.CCCCCC.C(O)(=O)C>[C:1]([CH:2]([CH3:3])[C:16]([C:18]1[CH:23]=[CH:22][C:21]([Cl:24])=[CH:20][C:19]=1[Cl:25])([OH:17])[CH2:15][N:10]1[CH:14]=[N:13][CH:12]=[N:11]1)#[N:4]

Participants

8

Reactant 4

HCID 7854PropionitrileHCID 516892Sodium BicarbonateHCID 7393741-(2,4-Dichlorophenyl)-2-(1H-1,2,4-triazol-1-yl)ethanoneHCID 178418339Butyllithium

Product 1

HCID 198241623-Cyano-2-(2,4-dichlorophenyl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol

Reagents, catalysts & solvents 3

HCID 176Acetic AcidSolventHCID 8028TetrahydrofuranSolvent3×HCID 8058HexaneSolvent

Conditions

Temperature
-70 °C

Procedure

Propionitrile (1.21 g) in dry tetrahydrofuran (50 ml) was cooled to -72° C. A solution of n-butyllithium in n-hexane (14.2 ml, 1.55 molar) was then slowly added while maintaining the temperature of the reaction mixture at -45° C. or below. After stirring for about 30 minutes, 2-(1H-1,2,4-triazol-1-yl)-2',4'-dichloroacetophenone (2.56 g) in dry tetrahydrofuran (THF) (50 ml) was added slowly with stirring over a 20 minute period, the temperature of the mixture being maintained at -70° C. Stirring was continued at this temperature for one hour and then at -10° for a half hour, then glacial acetic acid (10 ml) in dry THF (15 ml) was added. The reaction mixture was allowed to warm to room temperature (20° C.), adjusted to pH 8 with solid sodium bicarbonate, and extracted with ethyl acetate (3×75 ml). The combined organic extracts were washed three times with water, dried (MgSO4), evaporated and ethyl ether (30 ml) was added to the residue, yielding a white crystalline solid and a yellow solution. The solid was filtered off, dissolved in a small volume of methylene chloride, and loaded onto an 18 g flash chromatography column of Merck's "Kieselgel 60" (Trade Mark) 230-400 mesh silica in ether (11×2 cm. diameter). Elution was carried out using 5% (by volume) acetone in ether at one p.s.i. (0.07 kg/m2) "Diastereoisomer 1" of the title compound was eluted first, 0.79 g, m.p. 178°-180° C.

Workup

  1. temperaturewhile maintaining the temperature of the reaction mixture at -45° C. or below
  2. stirringwith stirring over a 20 minute period
  3. stirringStirring
  4. waitwas continued at this temperature for one hour
  5. waitat -10° for a half hour
  6. temperatureto warm to room temperature (20° C.)
  7. extractionextracted with ethyl acetate (3×75 ml)
  8. washThe combined organic extracts were washed three times with water
  9. dry with materialdried (MgSO4)
  10. customevaporated
  11. additionethyl ether (30 ml) was added to the residue
  12. customyielding a white crystalline solid
  13. filtrationThe solid was filtered off
  14. dissolutiondissolved in a small volume of methylene chloride
  15. washElution
  16. wash(0.07 kg/m2) "Diastereoisomer 1" of the title compound was eluted first

Sources & evidence

ORD record
ord-bd6a9f9d69ad4022b264555d4313eb3a
Source dataset
uspto-grants-1991_09
Patent number
US05047548

Reaction notes

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