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

HRID 2392067Notes

Reaction equation

HRID 2392067 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-(cyclohexyl methyl)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-fa804e84abb24061857d86982ff4c671
Source dataset
uspto-grants-2012_09
Patent number
US08273782B2

Reaction notes

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