Triacetoxyperiodinane → (R)-2-((6-((3H-imidazo[4,5-b]pyridin-3-yl)methyl)benzo[d]thiazol-2-yl)amino)cyclohexanone

HRID 1848023Notes

Reaction equation

HRID 1848023 reaction equation
[N:1]1[C:9]2[C:4](=[N:5][CH:6]=[CH:7][CH:8]=2)[N:3]([CH2:10][C:11]2[CH:27]=[CH:26][C:14]3[N:15]=[C:16]([NH:18][C@@H:19]4[CH2:24][CH2:23][CH2:22][CH2:21][C@H:20]4[OH:25])[S:17][C:13]=3[CH:12]=2)[CH:2]=1.CC(OI1(OC(C)=O)(OC(C)=O)OC(=O)C2C=CC=CC1=2)=O>C(Cl)Cl.CC#N.CC(N(C)C)=O>[N:1]1[C:9]2[C:4](=[N:5][CH:6]=[CH:7][CH:8]=2)[N:3]([CH2:10][C:11]2[CH:27]=[CH:26][C:14]3[N:15]=[C:16]([NH:18][C@@H:19]4[CH2:24][CH2:23][CH2:22][CH2:21][C:20]4=[O:25])[S:17][C:13]=3[CH:12]=2)[CH:2]=1

Participants

4

Reactant 2

HCID 159087TriacetoxyperiodinaneHCID 86680998(1R,2R)-2-((6-((3H-imidazo[4,5-b]pyridin-3-yl)methyl)benzo[d]thiazol-2-yl)amino)cyclohexanol

Product 1

HCID 71549997(R)-2-((6-((3H-imidazo[4,5-b]pyridin-3-yl)methyl)benzo[d]thiazol-2-yl)amino)cyclohexanoneYield 80%

Reagents, catalysts & solvents 1

HCID 131732436DCM MeCN DMASolvent

Procedure

(1R,2R)-2-((6-((3H-Imidazo[4,5-b]pyridin-3-yl)methyl)benzo[d]thiazol-2-yl)amino)cyclohexanol from Example 3 (188 mg, 0.50 mmol) was stirred in a mixture of DCM/MeCN/DMA (4:4:2, v/v/v) at rt. Dess-Martin periodinane (254 mg, 0.60 mmol) was added and the mixture was stirred at rt for 30 min before another batch of periodinane (254 mg, 0.60 mmol) was added. The resulting mixture was heated at 55° C. for 4 h, then another batch of periodinane (254 mg, 0.60 mmol) was added and the reaction mixture was heated at 60° C. for 6 h. LCMS showed that the reaction was mostly complete. The mixture was then cooled to rt and partitioned between DCM and 3% aq NaOH, and then the organic layer was washed with brine, dried over MgSO4, and concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 0-100% EtOAc in hexanes to give (R)-2-((6-((3H-imidazo[4,5-b]pyridin-3-yl)methyl)benzo[d]thiazol-2-yl)amino)cyclohexanone (150 mg, 80%) as a white solid. 1H NMR (300 MHz, DMSO-d6) δ 8.60 (s, 1H), 8.38 (dd, J=1.2, 4.8 Hz, 1H), 8.22 (d, J=7.3 Hz, 1H), 8.09 (dd, J=1.3, 8.1 Hz, 1H), 7.70 (d, J=1.1 Hz, 1H), 7.26-7.35 (m, 2H), 7.19-7.26 (m, 1H), 5.49 (s, 2H), 4.68 (td, J=6.5, 12.8 Hz, 1H), 2.53-2.67 (m, 1H), 2.42 (ddd, J=2.7, 5.9, 12.3 Hz, 1H), 2.30 (d, J=13.4 Hz, 1H), 1.94-2.12 (m, 1H), 1.82 (br s, 2H), 1.38-1.66 (m, 2H). LCMS (ESI) m/z 378 (M+H)+.

Workup

  1. additionwas added
  2. temperatureThe resulting mixture was heated at 55° C. for 4 h
  3. additionanother batch of periodinane (254 mg, 0.60 mmol) was added
  4. temperaturethe reaction mixture was heated at 60° C. for 6 h
  5. temperatureThe mixture was then cooled to rt
  6. custompartitioned between DCM and 3% aq NaOH
  7. washthe organic layer was washed with brine
  8. dry with materialdried over MgSO4
  9. concentrationconcentrated under reduced pressure
  10. customThe residue was purified by silica gel chromatography
  11. washeluting with 0-100% EtOAc in hexanes

Sources & evidence

ORD record
ord-f032f88b9fda4be8ad60655de87d2e97
Source dataset
uspto-grants-2015_02
Patent number
US08952058B2

Reaction notes

Loading…