Cesium carbonate → tert-butyl 3-(2-(3-(7-(tert-butylcarbamoyl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl)-6-fluoro-1H-indazol-1-yl)ethyl)azetidine-1-carboxylate

HRID 246434Notes

Reaction equation

HRID 246434 reaction equation
[C:1]([NH:5][C:6]([C:8]1[C:16]2[C:11](=[N:12][CH:13]=[C:14]([C:17]3[C:25]4[C:20](=[CH:21][C:22]([F:26])=[CH:23][CH:24]=4)[NH:19][N:18]=3)[N:15]=2)[N:10]([CH2:27][O:28][CH2:29][CH2:30][Si:31]([CH3:34])([CH3:33])[CH3:32])[CH:9]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].I[CH2:36][CH2:37][CH:38]1[CH2:41][N:40]([C:42]([O:44][C:45]([CH3:48])([CH3:47])[CH3:46])=[O:43])[CH2:39]1.C([O-])([O-])=O.[Cs+].[Cs+]>CN(C=O)C.ClCCl>[C:1]([NH:5][C:6]([C:8]1[C:16]2[C:11](=[N:12][CH:13]=[C:14]([C:17]3[C:25]4[C:20](=[CH:21][C:22]([F:26])=[CH:23][CH:24]=4)[N:19]([CH2:36][CH2:37][CH:38]4[CH2:41][N:40]([C:42]([O:44][C:45]([CH3:46])([CH3:48])[CH3:47])=[O:43])[CH2:39]4)[N:18]=3)[N:15]=2)[N:10]([CH2:27][O:28][CH2:29][CH2:30][Si:31]([CH3:34])([CH3:33])[CH3:32])[CH:9]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 19034125tert-Butyl 3-(2-iodoethyl)azetidine-1-carboxylateHCID 71279957N-tert-butyl-2-(6-fluoro-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide

Product 1

HCID 71280628tert-butyl 3-(2-(3-(7-(tert-butylcarbamoyl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl)-6-fluoro-1H-indazol-1-yl)ethyl)azetidine-1-carboxylateYield 99.5%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Conditions

Temperature
25 °C

Procedure

In a 2-5 mL Biotage microwave vial were mixed N-tert-butyl-2-(6-fluoro-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (75 mg, 155 mmol), tert-butyl 3-(2-iodoethyl)azetidine-1-carboxylate (68 mg, 219 μmol.41) and Cs2CO3 (203 mg, 622 μmol) in DMF (2.00 mL). The mixture was stirred ˜10 min at 25° C. then heated to 100° C. in the Biotage microwave reactor for 30 min, diluted with 10 mL of dichloromethane and filtered through a celite pad, filtrate concentrated under high vacuum at 65° C. and residue dissolved in dichloromethane and purified by chromatography (40 g column, 50 μm silica-gel from Analogix, 0 to 5% over 20 min (MeOH containing 10% ammonium hydroxide)/dichloromethane to give tert-butyl 3-(2-(3-(7-(tert-butylcarbamoyl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl)-6-fluoro-1H-indazol-1-yl)ethyl)azetidine-1-carboxylate (103 mg, 155 μmol, 99.5%) as a white solid. MS (M+Na)+=688; 1H NMR (CDCl3) δ: 9.24 (s, 1H), 8.56 (dd, J=8.7, 5.3 Hz, 1H), 8.37 (s, 1H), 8.09 (s, 1H), 6.98-7.16 (m, 2H), 5.75 (s, 2H), 4.46 (t, J=6.4 Hz, 2H), 4.02 (t, J=8.3 Hz, 2H), 3.49-3.72 (m, 5H), 2.49-2.69 (m, 1H), 2.33 (q, J=6.8 Hz, 2H), 1.65 (s, 9H), 1.48 (s, 2H), 1.45 (s, 9H), 0.92-1.03 (m, 2H), 0.00 (s, 9H); LCMS ESI+ TIC MS showed 100% purity, [M+Na]+=688.0.

Workup

  1. temperaturethen heated to 100° C. in the Biotage microwave reactor for 30 min
  2. filtrationfiltered through a celite pad, filtrate
  3. concentrationconcentrated under high vacuum at 65° C.
  4. dissolutionresidue dissolved in dichloromethane
  5. custompurified by chromatography (40 g column, 50 μm silica-gel from Analogix, 0 to 5% over 20 min (MeOH containing 10% ammonium hydroxide)/dichloromethane

Sources & evidence

ORD record
ord-3c82c790f9104165a3c93c4200c1ad18
Source dataset
uspto-grants-2014_02
Patent number
US08658646B2

Reaction notes

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