Potassium Acetate → tert-butyl 4-((1R)-1-(6-fluoro-5-(2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl)pyridin-3-yl)ethyl)piperazine-1-carboxylate

HRID 1812267Notes

Reaction equation

HRID 1812267 reaction equation
Cl[C:2]1[N:10]=[C:9]([CH3:11])[N:8]=[C:7]2[C:3]=1[N:4]=[CH:5][N:6]2[CH:12]1[CH2:17][CH2:16][CH2:15][CH2:14][O:13]1.[C:18]([O:22][C:23]([N:25]1[CH2:30][CH2:29][N:28]([C@@H:31]([C:33]2[CH:34]=[C:35](B(O)O)[C:36]([F:39])=[N:37][CH:38]=2)[CH3:32])[CH2:27][CH2:26]1)=[O:24])([CH3:21])([CH3:20])[CH3:19].C([O-])(=O)C.[K+]>O1CCOCC1.ClCCl.O.[Cl-].[Na+].O>[F:39][C:36]1[N:37]=[CH:38][C:33]([C@H:31]([N:28]2[CH2:27][CH2:26][N:25]([C:23]([O:22][C:18]([CH3:19])([CH3:21])[CH3:20])=[O:24])[CH2:30][CH2:29]2)[CH3:32])=[CH:34][C:35]=1[C:2]1[N:10]=[C:9]([CH3:11])[N:8]=[C:7]2[C:3]=1[N:4]=[CH:5][N:6]2[CH:12]1[CH2:17][CH2:16][CH2:15][CH2:14][O:13]1

Participants

8

Reactant 3

HCID 517044Potassium AcetateHCID 595482686-chloro-2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purineHCID 66600472(R)-5-(1-(4-(tert-butoxycarbonyl)piperazin-1-yl)ethyl)-2-fluoropyridin-3-ylboronic acid

Product 1

HCID 68518749tert-butyl 4-((1R)-1-(6-fluoro-5-(2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl)pyridin-3-yl)ethyl)piperazine-1-carboxylateYield 77%

Reagents, catalysts & solvents 4

HCID 962WaterSolvent2×HCID 6344DichloromethaneSolventHCID 312751,4-DioxaneSolventHCID 57417360Sodium chloride; waterSolvent

Conditions

Temperature
120 °C

Procedure

A glass microwave reaction vessel was charged with 6-chloro-2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purine (0.250 g, 0.989 mmol) and (R)-5-(1-(4-(tert-butoxycarbonyl)piperazin-1-yl)ethyl)-2-fluoropyridin-3-ylboronic acid (0.489 g, 1.385 mmol) in dioxane (3 mL). Then A-Phos (0.070 g, 0.099 mmol), potassium acetate (0.291 g, 2.97 mmol) and water (0.5 mL) were added into the reaction mixture. The reaction mixture was stirred and heated in a CEM Explorer Microwave at 120° C. for 10 min (120 watts, Powermax feature on). The mixture was diluted with dichloromethane (10 mL), water (10 mL) and brine solution (5 mL). The organic layer was collected by extracting with dichloromethane (3×10 mL). The combined organic extracts were dried over sodium sulfate, filtered and concentrated in vacuo to give the crude material as a tan oil. The crude material was adsorbed onto a plug of silica gel and purified by chromatography through a silica-gel column (40 g) eluting with 100% ethyl acetate to give tert-butyl 4-((1R)-1-(6-fluoro-5-(2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl)pyridin-3-yl)ethyl)piperazine-1-carboxylate (0.400 g, 0.761 mmol, 77% yield) as a light-yellow solid. 1H NMR (400 MHz, CDCl3) δ 8.20-8.29 (m, 3H) 5.78 (dd, J=10.37, 2.35 Hz, 1H) 3.76 (s, 1H) 3.55 (d, J=6.65 Hz, 1H) 3.34 (s, 5H) 2.82 (s, 3H) 2.33 (d, J=5.09 Hz, 5H) 1.95-2.13 (m, 3H) 1.56-1.81 (m, 5H) 1.33-1.40 (m, 9H). m/z (ESI, +ve ion) 526.2 (M+H)+.

Workup

  1. customA glass microwave reaction vessel
  2. customThe organic layer was collected
  3. extractionby extracting with dichloromethane (3×10 mL)
  4. dry with materialThe combined organic extracts were dried over sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customto give the crude material as a tan oil
  8. custompurified by chromatography through a silica-gel column (40 g)
  9. washeluting with 100% ethyl acetate

Sources & evidence

ORD record
ord-1b003636f5f04b379bdc862437b854ac
Source dataset
uspto-grants-2013_01
Patent number
US08362241B2

Reaction notes

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