Dimethylformamide → N-phenyl-6-cyano-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbothioamide

HRID 36065

Reaction equation

HRID 36065 reaction equation
[C:1]([C:3]1[CH:4]=[CH:5][C:6]2[O:11][C:10]([CH3:13])([CH3:12])[C:9](=[O:14])[CH2:8][C:7]=2[CH:15]=1)#[N:2].[C:16]1([N:22]=[C:23]=[S:24])[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.CN(C)C=O.CC(C)([O-])C.[K+]>C(O)(=O)C>[C:16]1([NH:22][C:23]([C:8]2[C:7]3[CH:15]=[C:3]([C:1]#[N:2])[CH:4]=[CH:5][C:6]=3[O:11][C:10]([CH3:13])([CH3:12])[C:9]=2[OH:14])=[S:24])[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1

Participants

6

Reactant 4

HCID 6228DimethylformamideHCID 7673Phenyl IsothiocyanateHCID 148695546-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-3-oneHCID 23665647Potassium tert-butoxide

Product 1

HCID 135720099N-phenyl-6-cyano-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbothioamideYield 47.9%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

To a mixture of 0.5 g of 6-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-3-one, 0.37 g of phenyl isothio-cyanate, and 5 ml of dried N,N-dimethylformamide was added 0.31 g of potassium t-butoxide with under ice-cooling, followed by stirring for 5 hours under ice-cooling. Ice-water was added thereto, and the mixture was made acidic with acetic acid and extracted with diethyl ether. The extract was washed with water and dried over sodium sulfate, and the ether layer was removed by distillation. The residue was purified by silica gel column chromatography (developing solution: CH2Cl2) to obtain 0.4 g of N-phenyl-6- cyano-3-hydroxy-2,2-dimethyl-2H-1-benzopyran-4-carbothioamide represented by formula shown below.

Workup

  1. temperaturecooling
  2. temperaturecooling
  3. extractionextracted with diethyl ether
  4. washThe extract was washed with water
  5. dry with materialdried over sodium sulfate
  6. customthe ether layer was removed by distillation
  7. customThe residue was purified by silica gel column chromatography (developing solution: CH2Cl2)

Sources & evidence

ORD record
ord-5b12e05a7622475082ec0de4fcdad81a
Source dataset
uspto-grants-1995_05
Patent number
US05412117

Linked notes

Loading…