Hydrazine → N-[(1S)-2-amino-1-(cyclohexyl methyl)ethyl]-5-chloro-4-(4-chloro-1-methyl-1H-pyrazol-5-yl)-2-thiophenecarboxamide

HRID 1845472Notes

Reaction equation

HRID 1845472 reaction equation
[Cl:1][C:2]1[S:6][C:5]([C:7]([NH:9][C@H:10]([CH2:18][N:19]2C(=O)C3C(=CC=CC=3)C2=O)[CH2:11][CH:12]2[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]2)=[O:8])=[CH:4][C:3]=1[C:30]1[N:34]([CH3:35])[N:33]=[CH:32][C:31]=1[Cl:36].NN>O1CCCC1.CO>[NH2:19][CH2:18][C@@H:10]([NH:9][C:7]([C:5]1[S:6][C:2]([Cl:1])=[C:3]([C:30]2[N:34]([CH3:35])[N:33]=[CH:32][C:31]=2[Cl:36])[CH:4]=1)=[O:8])[CH2:11][CH:12]1[CH2:13][CH2:14][CH2:15][CH2:16][CH2:17]1

Participants

5

Reactant 2

HCID 9321HydrazineHCID 578265045-chloro-4-(4-chloro-1-methyl-1H-pyrazol-5-yl)-N-{(1S)-2-cyclohexyl-1-[(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)methyl]ethyl}-2-thiophenecarboxamide

Product 1

HCID 24996916N-[(1S)-2-amino-1-(cyclohexyl methyl)ethyl]-5-chloro-4-(4-chloro-1-methyl-1H-pyrazol-5-yl)-2-thiophenecarboxamideYield 70.7%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 5-chloro-4-(4-chloro-1-methyl-1H-pyrazol-5-yl)-N-{(1S)-2-cyclohexyl-1-[(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)methyl]ethyl}-2-thiophenecarboxamide (303 mg, 0.55 mmol) in tetrahydrofuran (2.78 ml) and methanol (2.78 ml) at 25° C. was added hydrazine (0.17 ml, 5.55 mmol) dropwise. After 12 h, the solution was concentrated, dry loaded onto silica and purified by column chromatography (5% MeOH in DCM (1% NH4OH)). The free base was then converted to the HCl salt by adding excess 4M HCl in dioxane (1 ml) to the residue in MeOH (2 ml) affording the HCl salt of N-[(1S)-2-amino-1-(cyclohexylmethyl)ethyl]-5-chloro-4-(4-chloro-1-methyl-1H-pyrazol-5-yl)-2-thiophenecarboxamide (190 mg, 0.389 mmol, 70.0% yield) as a yellow solid: LCMS (ES) m/z=415, 417 (M, M+2)+, 1H NMR (400 MHz, DMSO-d6) δ ppm 8.84 (br. s., 1H) 8.06 (s, 4H) 7.74 (s, 1H) 4.25 (dd, J=8.84, 4.29 Hz, 1H) 3.77 (s, 3H) 2.87-2.93 (m, 2H) 1.71-1.79 (m, 1H) 1.64 (d, J=9.85 Hz, 3H) 1.54 (br. s., 1H) 1.48 (br. s., 1H) 1.37 (dd, J=13.26, 4.93 Hz, 1H) 1.14 (br. s., 1H) 1.17 (d, J=7.33 Hz, 2H) 0.93 (d, J=10.86 Hz, 1H) 0.82-0.89 (m, 1H).

Workup

  1. concentrationthe solution was concentrated
  2. customdry loaded onto silica
  3. custompurified by column chromatography (5% MeOH in DCM (1% NH4OH))
  4. additionby adding excess 4M HCl in dioxane (1 ml) to the residue in MeOH (2 ml)

Sources & evidence

ORD record
ord-f5ca2bcf216948e9a524ebb3f1331387
Source dataset
uspto-grants-2015_02
Patent number
US08946278B2

Reaction notes

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