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Cesium carbonate → 4-(benzyloxy)-1-(1-(3-(tert-butyldimethylsilyloxy)propyl)-1H-indazol-5-yl)pyridin-2(1H)-one

HRID 2387482
Notes
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Reaction equation

HRID 2387482 reaction equation
[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][N:12]([C:15]2[CH:16]=[C:17]3[C:21](=[CH:22][CH:23]=2)[NH:20][N:19]=[CH:18]3)[C:11](=[O:24])[CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C([O-])([O-])=O.[Cs+].[Cs+].Br[CH2:32][CH2:33][CH2:34][O:35][Si:36]([C:39]([CH3:42])([CH3:41])[CH3:40])([CH3:38])[CH3:37]>CS(C)=O>[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][N:12]([C:15]2[CH:16]=[C:17]3[C:21](=[CH:22][CH:23]=2)[N:20]([CH2:32][CH2:33][CH2:34][O:35][Si:36]([C:39]([CH3:40])([CH3:42])[CH3:41])([CH3:37])[CH3:38])[N:19]=[CH:18]3)[C:11](=[O:24])[CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 607486(3-Bromopropoxy)(tert-butyl)dimethylsilaneHCID 576255174-(benzyloxy)-1-(1H-indazol-5-yl)pyridin-2(1H)-one

Product 1

HCID 684584114-(benzyloxy)-1-(1-(3-(tert-butyldimethylsilyloxy)propyl)-1H-indazol-5-yl)pyridin-2(1H)-oneYield 29.2%

Reagents, catalysts & solvents 1

HCID 679
Dimethyl Sulfoxide
Solvent

Procedure

To a solution of 4-(benzyloxy)-1-(1H-indazol-5-yl)pyridine-2(1H)-one (200 mg, 0.63 mmol) in DMSO (5 mL) was added Cs2CO3 (1.03 g, 3.15 mmol) and (3-bromopropoxy)-tert-butyldimethylsilane (0.15 mL, 0.66 mmol). After stirring overnight at ambient temperature under argon, the reaction mixture was filtered through a layer of Celite and concentrated. Purification by flash column chromatography (silica gel, EtOAc/hexanes, 50:50) gave 4-(benzyloxy)-1-(1-(3-(tert-butyldimethylsilyloxy)propyl)-1H-indazol-5-yl)pyridin-2(1H)-one (90 mg, 29%). To a solution of 4-(benzyloxy)-1-(1-(3-(tert-butyldimethylsilyloxy)propyl)-1H-indazol-5-yl)pyridin-2(1H)-one in THF (3 mL) was added TBAF (0.75 mL, 0.75 mmol, 1.0 M). After the reaction was complete, the mixture was treated with H2O, extracted with CH2Cl2, and the combined organics were concentrated. Purification by flash column chromatography (silica gel, EtOAc/hexanes, 50:50) gave 4-(benzyloxy)-1-(1-(3-hydroxypropyl)-1H-indazol-5-yl)pyridin-2(1H)-one (50 mg, 88%) as a white solid. In accordance with the procedure of Example 1, the HCl salt was made to give the title compound as a white solid. 1H NMR (500 MHz, DMSO-d6) δ 8.12 (s, 1H), 7.73-7.71 (m, 2H), 7.62 (d, J=7.5 Hz, 1H), 7.48-7.36 (m, 5H), 7.33 (dd, J=9.0, 1.5 Hz, 1H), 6.10 (dd, J=7.5, 2.5 Hz, 1H), 5.99 (d, J=2.5 Hz, 1H), 5.15 (s, 2H), 4.50 (t, J=7.0 Hz, 2H), 3.38 (t, J=6.5 Hz, 2H), 2.01-1.96 (m, 2H); ESI MS m/z 376 [M+H]+.

Workup

  1. filtrationthe reaction mixture was filtered through a layer of Celite
  2. concentrationconcentrated
  3. customPurification by flash column chromatography (silica gel, EtOAc/hexanes, 50:50)

Sources & evidence

ORD record
ord-f15d832a73a64a2793b73342ebd82156
Source dataset
uspto-grants-2012_09
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08268868B2

Reaction notes

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