Triacetoxyperiodinane → (S)-Ethyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-formyl-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate

HRID 921102Notes

Reaction equation

HRID 921102 reaction equation
[CH2:1]([O:4][C:5]1([CH3:34])[CH2:10][CH2:9][N:8]([C:11]2[N:16]3[N:17]=[C:18]([CH2:20][OH:21])[CH:19]=[C:15]3[N:14]=[C:13]([CH3:22])[C:12]=2[C@H:23]([O:29][C:30]([CH3:33])([CH3:32])[CH3:31])[C:24]([O:26][CH2:27][CH3:28])=[O:25])[CH2:7][CH2:6]1)[CH:2]=[CH2:3].CC(OI1(OC(C)=O)(OC(C)=O)OC(=O)C2C=CC=CC1=2)=O>C(Cl)Cl>[CH2:1]([O:4][C:5]1([CH3:34])[CH2:10][CH2:9][N:8]([C:11]2[N:16]3[N:17]=[C:18]([CH:20]=[O:21])[CH:19]=[C:15]3[N:14]=[C:13]([CH3:22])[C:12]=2[C@H:23]([O:29][C:30]([CH3:33])([CH3:32])[CH3:31])[C:24]([O:26][CH2:27][CH3:28])=[O:25])[CH2:7][CH2:6]1)[CH:2]=[CH2:3]

Participants

4

Reactant 2

HCID 159087TriacetoxyperiodinaneHCID 118318735(S)-Ethyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-(hydroxymethyl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate

Product 1

HCID 118318786(S)-Ethyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-formyl-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetateYield 71.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of (S)-ethyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-(hydroxymethyl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate (0.2747 g, 0.579 mmol) in wet DCM (5 mL) was added Dess-Martin periodinane (0.319 g, 0.752 mmol) and the mixture was stirred at room temperature. After 3 h, the solids were removed by filtration. The filtrate was washed with aq Na2S2O3, dried (Na2SO4), filtered and concentrated. The resulting oil was purified by flash chromatography (Biotage; 0%-50% EtOAc/hexane; 10 CV) to give the title compound (0.1962 g, 0.415 mmol, 71.7% yield) as a colorless oil. 1H NMR (400 MHz, CDCl3) δ 10.17 (s, 1H), 7.02 (s, 1H), 6.19-5.98 (m, 1H), 5.96-5.76 (m, 1H), 5.57-5.37 (m, 2H), 5.24 (dd, J=10.4, 1.6 Hz, 1H), 4.24 (dd, J=15.9, 7.1 Hz, 2H), 4.03 (d, J=4.9 Hz, 2H), 2.65 (s, 3H), 2.08-1.93 (m, 5H), 1.81-1.66 (m, 1H), 1.37 (s, 3H), 1.29-1.25 (m, 12H). 2 piperidine protons not seen by NMR. LCMS (M+H) calcd for C25H37N4O5: 473.27. found: 473.3.

Workup

  1. customthe solids were removed by filtration
  2. washThe filtrate was washed with aq Na2S2O3
  3. dry with materialdried (Na2SO4)
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe resulting oil was purified by flash chromatography (Biotage; 0%-50% EtOAc/hexane; 10 CV)

Sources & evidence

ORD record
ord-0825a6ab5f024857b09737c36297f6e9
Source dataset
uspto-grants-2016_03
Patent number
US09273067B2

Reaction notes

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