Triethylamine → 5-amino-3-(3-bromobenzyl)-1-isopropyl-1H-pyrazole-4-carbonitrile

HRID 530972

Reaction equation

HRID 530972 reaction equation
CO[C:3]([CH2:9][C:10]1[CH:15]=[CH:14][CH:13]=[C:12]([Br:16])[CH:11]=1)=[C:4]([C:7]#[N:8])[C:5]#[N:6].Cl.[CH:18]([NH:21][NH2:22])([CH3:20])[CH3:19].C(N(CC)CC)C>C(O)C>[NH2:6][C:5]1[N:21]([CH:18]([CH3:20])[CH3:19])[N:22]=[C:3]([CH2:9][C:10]2[CH:15]=[CH:14][CH:13]=[C:12]([Br:16])[CH:11]=2)[C:4]=1[C:7]#[N:8]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 855731-Isopropylhydrazine hydrochlorideHCID 716059322-(Methoxy(3-bromobenzyl)methylene)malononitrile

Product 1

HCID 895873135-amino-3-(3-bromobenzyl)-1-isopropyl-1H-pyrazole-4-carbonitrileYield 87.3%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

Compound 33 (3.124 g, 11.3 mmol), isopropylhydrazine hydrochloride (1.27 g, 11.5 mmol) (purchased from Ryan Scientific) and triethylamine (6.40 mL, 46.0 mmol) were allowed to react in ethanol (75 mL) at room temperature for 1 hr. After concentrating the reaction mixture, it was purified by silica chromatography using a chloroform/methanol solvent system (methanol gradient increased with time from 0-10%). The relevant fractions were concentrated in vacuo to yield a yellow powder (3.15 g, 87% yield): 1H NMR (400 MHz, DMSO) δ 7.41 (m, 2H), 7.26 (td, J=7.7, 1.2, 1H), 7.21 (dt, J=7.7, 1.3, 1H), 6.50 (s, 2H), 4.38 (hept, J=6.5, 1H), 3.81 (s, 2H), 1.27 (d, J=6.5, 6H); 13C NMR (100 MHz, DMSO) δ 151.01, 150.15, 141.24, 131.05, 130.53, 129.16, 127.45, 121.55, 115.16, 71.77, 47.24, 32.88, 21.35; [M+H]+ calculated for C14H15BrN4 319.0, 321.0 found 318.9: 321.0.

Workup

  1. concentrationAfter concentrating the reaction mixture, it
  2. customwas purified by silica chromatography
  3. temperaturea chloroform/methanol solvent system (methanol gradient increased with time from 0-10%)
  4. concentrationThe relevant fractions were concentrated in vacuo

Sources & evidence

ORD record
ord-bb03d74923ac4bddba44e2bc80cbf309
Source dataset
uspto-grants-2016_05
Patent number
US09353116B2

Linked notes

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