5-Bromo-2-methoxypyridine → 6-(2-methoxypyridin-5-yl)-3-((E)-styryl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-indazole

HRID 1816828Notes

Reaction equation

HRID 1816828 reaction equation
[CH:1](/[C:9]1[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[N:11]([CH2:18][O:19][CH2:20][CH2:21][Si:22]([CH3:25])([CH3:24])[CH3:23])[N:10]=1)=[CH:2]\[C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.Br[C:27]1[CH:28]=[CH:29][C:30]([O:33][CH3:34])=[N:31][CH:32]=1.C[Sn](C)C.C[Sn](C)C>O1CCOCC1.C(OCC)(=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:34][O:33][C:30]1[CH:29]=[CH:28][C:27]([C:14]2[CH:13]=[C:12]3[C:17]([C:9](/[CH:1]=[CH:2]/[C:3]4[CH:4]=[CH:5][CH:6]=[CH:7][CH:8]=4)=[N:10][N:11]3[CH2:18][O:19][CH2:20][CH2:21][Si:22]([CH3:23])([CH3:25])[CH3:24])=[CH:16][CH:15]=2)=[CH:32][N:31]=1

Participants

7

Reactant 3

HCID 27348955-Bromo-2-methoxypyridineHCID 6327618HexamethylditinHCID 22494879((E)-styryl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-indazole

Product 1

HCID 218774306-(2-methoxypyridin-5-yl)-3-((E)-styryl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-indazoleYield 40%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalyst2×HCID 8857Ethyl AcetateSolventHCID 312751,4-DioxaneSolvent

Procedure

6-(22-methoxypyridin-5-yl)-3-(((E)-styryl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-indazole was converted to 6-(2-methoxypyridin-5-yl)-3-E-styryl-1H-indazole in a similar manner to that described for Example 27(a). 1H NMR (300 MHz, CDCl3) □8.53 (d, 1H, J=2.1 Hz), 8.15 (d, 1H, J-9.2 Hz), 7.97 (dd, 1H, 1=2.6, 8.6 Hz), 7.79 (s, 1H), 7.74-7.34 (m, 8H), 6.94 (d, 1H, J=8.6 Hz). HRMS (FAB) [M+H]/z Calc'd 328.1450, found 328.1462. Anal. Calc'd, C (77.04), H (5.23), N (12.83). Found: C (77.00), H (5.28), N (12.65). The starting material was prepared as follows: A solution of 5-bromo-2-methoxypyridine (2.00 g, 6.10 mmol), hexamethylditin (1.15 g, 6.10 mmol), and Pd(PPh3)4 (0.28 g, 0.24 mmol) in degassed dioxane (10 ml) was refluxed under for 16 h. 6-Iodo-3-((E)-styryl)-1-(2-trimethylsilanylthoxymethyl)-1H-indazole (2.90 g, 6.10 mmol) was added to above mixture, followed by Pd(PPh3)4 (0.35 g 0.31 mmol). The reaction mixture was refluxed for 16 h. The mixture was then diluted with ethyl acetate (150 ml), and washed with brine (30 ml). The organics were dried over MgSO4, then concentrated under reduced pressure. Purification by silica gel chromatography gave 6-(2-methoxypyridin-5-yl)-3-((E)-styryl)-1-(2-trimethylsilanyl-ethoxymethyl)1H-indazole as a yellow solid (1.12 g, 40%). 1H NMR (300 MHz, CDCl3) δ 8.51 (d, 1H, J=2.5 Hz), 8.50 (d, 1H, J=9.1 Hz), 7.93 (dd, 1H, J=2.5, 8.6 Hz), 7.69 (s, 1H), 7.69-7.28 (m, 8H), 6.89 (d, 1H, J=8.6 Hz), 5.83 (s, 2H), 4.03 (s, 3H), 3.64 (t, 2H, J=8.3 Hz), 0.93 (t, 2H, 1=8.3 Hz), −0.03 (s, 9H).

Workup

  1. customThe starting material was prepared
  2. temperatureThe reaction mixture was refluxed for 16 h
  3. washwashed with brine (30 ml)
  4. dry with materialThe organics were dried over MgSO4
  5. concentrationconcentrated under reduced pressure
  6. customPurification by silica gel chromatography

Sources & evidence

ORD record
ord-d37b9bd26d0c42b0be4c221aab6b7589
Source dataset
uspto-grants-2005_04
Patent number
US06884890B2

Reaction notes

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