Acetic Acid → 3-Chloro-2-(5-(methyl(2,2,6,6-tetramethylpiperidin-4-yl)amino)-1,3,4-thiadiazol-2-yl)-5-(1-methyl-1H-pyrazol-4-yl)phenol

HRID 579318Notes

Reaction equation

HRID 579318 reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([C:8]2[CH:9]=[N:10][N:11]([CH3:13])[CH:12]=2)[CH:5]=[CH:4][C:3]=1[C:14]1[S:18][C:17]([N:19]([CH3:30])[CH:20]2[CH2:25][C:24]([CH3:27])([CH3:26])[NH:23][C:22]([CH3:29])([CH3:28])[CH2:21]2)=[N:16][N:15]=1.CC(O)=[O:33].CC(OC(C)=O)=O>CO.CC([O-])=O.CC([O-])=O.[Pd+2]>[Cl:1][C:2]1[C:3]([C:14]2[S:18][C:17]([N:19]([CH3:30])[CH:20]3[CH2:21][C:22]([CH3:29])([CH3:28])[NH:23][C:24]([CH3:26])([CH3:27])[CH2:25]3)=[N:16][N:15]=2)=[C:4]([OH:33])[CH:5]=[C:6]([C:8]2[CH:9]=[N:10][N:11]([CH3:13])[CH:12]=2)[CH:7]=1

Participants

6

Reactant 3

HCID 176Acetic AcidHCID 7918Acetic AnhydrideHCID 867271385-(2-Chloro-4-(1-methyl-1H-pyrazol-4-yl)phenyl)-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)-1,3,4-thiadiazol-2-amine

Product 1

HCID 1363413413-Chloro-2-(5-(methyl(2,2,6,6-tetramethylpiperidin-4-yl)amino)-1,3,4-thiadiazol-2-yl)-5-(1-methyl-1H-pyrazol-4-yl)phenol

Reagents, catalysts & solvents 2

HCID 167845palladium(II) acetateCatalystHCID 887MethanolSolvent4×

Conditions

Temperature
80 °C

Procedure

To a stirred solution of 5-(2-chloro-4-(1-methyl-1H-pyrazol-4-yl)phenyl)-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)-1,3,4-thiadiazol-2-amine (Example 25) (125 mg, 0.281 mmol) in 1:1 AcOH:Ac2O (2.8 mL) was added Phl(OAc)2 (127 mg, 0.393 mmol) followed by Pd(OAc)2 (6 mg, 0.028 mmol). The reaction mixture was warmed to 80° C. and stirred for 48 hours. The reaction mixture was cooled to room temperature, then diluted with MeOH (10 mL) and loaded onto a 2 g SCX cartridge (pre-wet with MeOH). The cartridge was washed with MeOH (10 mL) then flushed with 7M NH3 in MeOH (10 mL). The MeOH/NH3 was removed in vacuo to afford the crude product as a brown glass-like solid. The crude material was taken up in MeOH (3 mL), passed through a syringe filter, and purified by mass-directed preparative HPLC under basic conditions (5 mM NH4OH) to give the crude product as a brown glass-like solid. The crude solid was re-dissolved in MeOH (3 mL) and re-purified by UV-directed preparative HPLC under acidic conditions (0.1% TFA), collecting at 348 nm. The combined fractions were loaded onto a 1 g SCX cartridge (pre-wet with MeOH) and the cartridge washed with MeOH (10 mL) then flushed with 7M NH3 in MeOH (10 mL). The MeOH/NH3 was removed in vacuo to afford the title compound as an off-white glass-like solid (6 mg, 5% yield). LC-MS: Rt 0.52 mins; MS m/z 461.3/463.2 [M+H]+ [Method D]. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.26 (s, 1H), 7.95 (s, 1H), 7.32 (s, 1H), 7.15 (d, J=1.52 Hz, 1H), 4.35 (br. s., 1H), 3.87 (s, 3H), 3.01 (s, 3H), 1.65 (d, J=9.60 Hz, 2H), 1.48 (br. s., 2H), 1.22 (br. s., 6H), 1.11 (br. s., 6H).

Workup

  1. temperatureThe reaction mixture was cooled to room temperature
  2. washThe cartridge was washed with MeOH (10 mL)
  3. customthen flushed with 7M NH3 in MeOH (10 mL)
  4. customThe MeOH/NH3 was removed in vacuo
  5. customto afford the crude product as a brown glass-like solid
  6. custompassed through a syringe
  7. filtrationfilter
  8. custompurified by mass-directed preparative HPLC under basic conditions (5 mM NH4OH)
  9. customto give the crude product as a brown glass-like solid
  10. customre-purified by UV-directed preparative HPLC under acidic conditions (0.1% TFA)
  11. customcollecting at 348 nm
  12. washthe cartridge washed with MeOH (10 mL)
  13. customthen flushed with 7M NH3 in MeOH (10 mL)
  14. customThe MeOH/NH3 was removed in vacuo

Sources & evidence

ORD record
ord-678e7dbfad734729bd7a3148e2d5b4bb
Source dataset
uspto-grants-2015_05
Patent number
US09040712B2

Reaction notes

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