Malononitrile → 6-Amino-4-(4-methoxyphenyl)-1-methyl-3-phenyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile

HRID 531203Notes

Reaction equation

HRID 531203 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]([CH:9]=O)=[CH:7][CH:8]=1.[C:11](#[N:15])[CH2:12][C:13]#[N:14].C(N(CC)CC)C.[CH3:23][N:24]1[C:28](=[O:29])[CH2:27][C:26]([C:30]2[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=2)=[N:25]1>C(O)C>[NH2:14][C:13]1[O:29][C:28]2[N:24]([CH3:23])[N:25]=[C:26]([C:30]3[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=3)[C:27]=2[CH:9]([C:6]2[CH:7]=[CH:8][C:3]([O:2][CH3:1])=[CH:4][CH:5]=2)[C:12]=1[C:11]#[N:15]

Participants

6

Reactant 4

HCID 8010MalononitrileHCID 8471TriethylamineHCID 312444-MethoxybenzaldehydeHCID 1425623H-Pyrazol-3-one, 2,4-dihydro-2-methyl-5-phenyl-

Product 1

HCID 896467086-Amino-4-(4-methoxyphenyl)-1-methyl-3-phenyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrileYield 20.4%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of anisaldehyde (350 μL, 2.87 mmol, 1.0 equ.), malononitrile (190 mg, 2.87 mmol, 1.0 equ.) and triethylamine (400 μL, 2.87 mmol, 1.0 equ.) in ethanol (10 mL) was stirred for 1 min, followed by the addition of 1-methyl-3-phenyl-1H-pyrazol-5(4H)-one (500 mg, 2.87 mmol, 1 equ.). The reaction mixture was concentrated after 24 h and the precipitate was washed with ethanol and hexanes, and product re-crystallized from ethanol to give 6-amino-4-(4-methoxyphenyl)-1-methyl-3-phenyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile (210 mg, 20%, 0.586 mmol) as a white solid. 1H-NMR (400 MHz) DMSO: 7.50-7.48 (d, 2H), 7.21-7.17 (m, 3H), 7.05-7.02 (m, 4H), 6.76-6.74 (d, 2H), 4.91 (s, 1H), 3.76 (s, 3H), 3.64 (s, 3H), 13C-NMR (100 MHz) DMSO: 158.9, 158.3, 146.0, 144.6, 136.9, 133.2, 128.9, 128.5, 127.8, 126.4, 120.6, 114.1, 95.9, 60.3, 55.3, 37.5, 34.5; LC/MS-MS: 359.2→293.0 m/z; GS1 and GS2 at 30, DP=66, CE=29, CXP=20, tR=3.98 min.

Workup

  1. concentrationThe reaction mixture was concentrated after 24 h
  2. washthe precipitate was washed with ethanol and hexanes, and product
  3. customre-crystallized from ethanol

Sources & evidence

ORD record
ord-d0b3f1ac5863472692e9c0254bf0ca1e
Source dataset
uspto-grants-2016_05
Patent number
US09353121B2

Reaction notes

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