Triethylamine → 4-(2-(5-(5-(isopropylamino)-1,3,4-oxadiazol-2-yl)-1H-indol-3-yl)pyrimidin-4-yl)-1-methylpiperazin-2-one

HRID 634247Notes

Reaction equation

HRID 634247 reaction equation
Cl[C:2]1[CH:7]=[CH:6][N:5]=[C:4]([C:8]2[C:16]3[C:11](=[CH:12][CH:13]=[C:14]([C:17]4[O:21][C:20]([NH:22][CH:23]([CH3:25])[CH3:24])=[N:19][N:18]=4)[CH:15]=3)[N:10](S(C3C=CC(C)=CC=3)(=O)=O)[CH:9]=2)[N:3]=1.[CH3:36][N:37]1[CH2:42][CH2:41][NH:40][CH2:39][C:38]1=[O:43].CCN(CC)CC.[OH-].[Na+]>CN1C(=O)CCC1>[CH:23]([NH:22][C:20]1[O:21][C:17]([C:14]2[CH:15]=[C:16]3[C:11](=[CH:12][CH:13]=2)[NH:10][CH:9]=[C:8]3[C:4]2[N:3]=[C:2]([N:40]3[CH2:41][CH2:42][N:37]([CH3:36])[C:38](=[O:43])[CH2:39]3)[CH:7]=[CH:6][N:5]=2)=[N:18][N:19]=1)([CH3:25])[CH3:24]

Participants

6

Reactant 4

HCID 8471TriethylamineHCID 14798Sodium HydroxideHCID 43990421-Methylpiperazin-2-oneHCID 867251125-(3-(4-chloropyrimidin-2-yl)-1-tosyl-1H-indol-5-yl)-N-isopropyl-1,3,4-oxadiazol-2-amine

Product 1

HCID 683287674-(2-(5-(5-(isopropylamino)-1,3,4-oxadiazol-2-yl)-1H-indol-3-yl)pyrimidin-4-yl)-1-methylpiperazin-2-oneYield 44.1%

Reagents, catalysts & solvents 1

HCID 13387N-methyl-2-pyrrolidoneSolvent

Conditions

Temperature
100 °C

Procedure

A glass microwave reaction vessel was charged with 5-(3-(4-chloropyrimidin-2-yl)-1-tosyl-1H-indol-5-yl)-N-isopropyl-1,3,4-oxadiazol-2-amine (80 mg, 0.157 mmol) and 1-methylpiperazin-2-one (17.94 mg, 0.157 mmol) in NMP (1.0 mL), followed by Et3N (65.6 μL, 0.472 mmol, Aldrich). The reaction was stirred and heated in a Initiator microwave reactor at 100° C. for 30 min. Then aq. NaOH (5 M, 0.3 mL) was added and the reaction was heated in microwave at 100° C. for 20 min. The mixture was purified with RP-HPLC (eluent: 10-60% MeCN in water with 0.1% TFA) and the fractions containing the product were combined and concentrated to remove AcCN. The remaining mixture was neutralized with sat. NaHCO3 and extracted with CHCl3/iPrOH (4:1). The combined organic layers were dried, filtered and concentrated to give 4-(2-(5-(5-(isopropylamino)-1,3,4-oxadiazol-2-yl)-1H-indol-3-yl)pyrimidin-4-yl)-1-methylpiperazin-2-one (30.0 mg, 0.069 mmol, 44.1%) as a light yellow solid. MS (ESI, pos. ion) m/z: 433.1 (M+1); 1H NMR (400 MHz, DMSO-d6) δ ppm 11.88 (1H, br. s.), 9.10 (1H, s), 8.30 (1H, d, J=6.1 Hz), 8.23 (1H, d, J=2.7 Hz), 7.60-7.73 (2H, m), 7.56 (1H, d, J=8.4 Hz), 6.69 (1H, d, J=6.1 Hz), 4.40 (2H, br. s.), 3.93 (2H, br. s.), 3.75 (1H, dq, J=13.3, 6.5 Hz), 3.51 (2H, t, J=5.2 Hz), 2.97 (3H, s), 1.25 (6H, d, J=6.8 Hz), 1.24 (3H, s).

Workup

  1. customA glass microwave reaction vessel
  2. temperaturethe reaction was heated in microwave at 100° C. for 20 min
  3. customThe mixture was purified with RP-HPLC (eluent: 10-60% MeCN in water with 0.1% TFA)
  4. additionthe fractions containing the product
  5. concentrationconcentrated
  6. customto remove AcCN
  7. extractionextracted with CHCl3/iPrOH (4:1)
  8. customThe combined organic layers were dried
  9. filtrationfiltered
  10. concentrationconcentrated

Sources & evidence

ORD record
ord-81bbdd295da14aa2b9b266afa37727f7
Source dataset
uspto-grants-2016_04
Patent number
US09321756B2

Reaction notes

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