Hydrochloric Acid → 5-(3-(6-isopropoxypyridin-2-yl)-1H-indol-5-yl)-N-(piperidin-3-yl)-1,3,4-thiadiazol-2-amine

HRID 634177Notes

Reaction equation

HRID 634177 reaction equation
[CH:1]([O:4][C:5]1[N:10]=[C:9]([C:11]2[C:19]3[C:14](=[CH:15][CH:16]=[C:17]([C:20]4[S:24][C:23]([NH:25][CH:26]5[CH2:31][CH2:30][CH2:29][N:28](C(OC(C)(C)C)=O)[CH2:27]5)=[N:22][N:21]=4)[CH:18]=3)[N:13](S(C3C=CC(C)=CC=3)(=O)=O)[CH:12]=2)[CH:8]=[CH:7][CH:6]=1)([CH3:3])[CH3:2].Cl>O1CCOCC1.O.[OH-].[Na+]>[CH:1]([O:4][C:5]1[N:10]=[C:9]([C:11]2[C:19]3[C:14](=[CH:15][CH:16]=[C:17]([C:20]4[S:24][C:23]([NH:25][CH:26]5[CH2:31][CH2:30][CH2:29][NH:28][CH2:27]5)=[N:22][N:21]=4)[CH:18]=3)[NH:13][CH:12]=2)[CH:8]=[CH:7][CH:6]=1)([CH3:3])[CH3:2]

Participants

6

Reactant 2

HCID 313Hydrochloric AcidHCID 68328847tert-butyl 3-(5-(3-(6-isopropoxypyridin-2-yl)-1-tosyl-1H-indol-5-yl)-1,3,4-thiadiazol-2-ylamino)piperidine-1-carboxylate

Product 1

HCID 683280335-(3-(6-isopropoxypyridin-2-yl)-1H-indol-5-yl)-N-(piperidin-3-yl)-1,3,4-thiadiazol-2-amine

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 14798Sodium HydroxideSolvent3×HCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

An orange solution of tert-butyl 3-(5-(3-(6-isopropoxypyridin-2-yl)-1-tosyl-1H-indol-5-yl)-1,3,4-thiadiazol-2-ylamino)piperidine-1-carboxylate (38.6 mg, 0.056 mmol) and aq. NaOH (2.0 M, 0.1 mL, 0.200 mmol) in dioxane (1.0 mL) was heated at 100° C. for 30 min. Additional aq. NaOH (2.0 M, 0.1 mL, 0.200 mmol) was added, and the resulting mixture was stirred at 100° C. for 1.5 h. The mixture was then concentrated in vacuo, and the residue was taken up in HCl (4.0 M in dioxane; 1.0 mL, 4.00 mmol). The resulting yellow-orange mixture was stirred at 25° C. for 1 h, diluted with H2O (4 mL) and 1 N aq NaOH (3.5 mL). The resulting mixture was partitioned between DCM (30 mL) and saturated aq NaHCO3 (20 mL). The organic layer was separated, and the aqueous layer was extracted with DCM (20 mL). The combined organic extracts were dried over sodium sulfate, filtered, and concentrated in vacuo to provide crude 5-(3-(6-isopropoxypyridin-2-yl)-1H-indol-5-yl)-N-(piperidin-3-yl)-1,3,4-thiadiazol-2-amine as a light-yellow solid, which was taken up in DMSO (2.0 mL) and purified by reverse phase HPLC (10-100% AcCN/H2O+0.1% TFA) to provide 5-(3-(6-isopropoxypyridin-2-yl)-1H-indol-5-yl)-N-(piperidin-3-yl)-1,3,4-thiadiazol-2-amine 2,2,2-trifluoroacetate (12.0 mg, 0.022 mmol, 39%) as a yellow oil: MS (ESI, pos. ion) m/z: 435.2 (M+1). 1H NMR (400 MHz, MeOH-d4) δ ppm 11.38 (br s, 1H), 8.80 (d, J=1.2 Hz, 1H), 7.98 (s, 1H), 7.75-7.79 (m, 1H), 7.71-7.75 (m, 1H), 7.54 (d, J=8.6 Hz, 1H), 7.43 (d, J=7.4 Hz, 1H), 6.66 (d, J=8.2 Hz, 1H), 5.53 (dt, J=12.2, 6.1 Hz, 1H), 4.07-4.16 (m, 1H), 3.68 (dd, J=12.2, 3.6 Hz, 1H), 3.34-3.35 (obsc m, 1H), 3.09-3.15 (m, 1H), 3.02-3.08 (m, 1H), 2.18-2.27 (m, 1H), 2.10 (dt, J=15.0, 5.1 Hz, 1H), 1.83-1.92 (m, 1H), 1.73-1.82 (m, 1H), 1.49-1.51 (m, 3H), 1.49 (s, 3H).

Workup

  1. concentrationThe mixture was then concentrated in vacuo
  2. stirringThe resulting yellow-orange mixture was stirred at 25° C. for 1 h
  3. customThe resulting mixture was partitioned between DCM (30 mL) and saturated aq NaHCO3 (20 mL)
  4. customThe organic layer was separated
  5. extractionthe aqueous layer was extracted with DCM (20 mL)
  6. dry with materialThe combined organic extracts were dried over sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-3a83984372444b3fb97a054c2c3dd72d
Source dataset
uspto-grants-2016_04
Patent number
US09321756B2

Reaction notes

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