Benzaldehyde → phenyl-(3-styryl-1-[2-(trimethyl-silanyl)-ethoxymethyl]-1H-indazol-6-yl}-methanol

HRID 1861082Notes

Reaction equation

HRID 1861082 reaction equation
I[C:2]1[CH:10]=[C:9]2[C:5]([C:6]([CH:19]=[CH:20][C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)=[N:7][N:8]2[CH2:11][O:12][CH2:13][CH2:14][Si:15]([CH3:18])([CH3:17])[CH3:16])=[CH:4][CH:3]=1.[Li]CCCC.[CH:32](=[O:39])[C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1>C1COCC1>[C:33]1([CH:32]([C:2]2[CH:10]=[C:9]3[C:5]([C:6]([CH:19]=[CH:20][C:21]4[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=4)=[N:7][N:8]3[CH2:11][O:12][CH2:13][CH2:14][Si:15]([CH3:18])([CH3:17])[CH3:16])=[CH:4][CH:3]=2)[OH:39])[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1

Participants

5

Reactant 3

HCID 240BenzaldehydeHCID 693701476-iodo-3-styryl-1-[2-(trimethyl-silanyl)ethoxymethyl]-1H-indazoleHCID 178418339Butyllithium

Product 1

HCID 69371793phenyl-(3-styryl-1-[2-(trimethyl-silanyl)-ethoxymethyl]-1H-indazol-6-yl}-methanolYield 50%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
-78 °C

Procedure

To a solution of 6-iodo-3-styryl-1-[2-(trimethyl-silanyl)-ethoxymethyl]-1H-indazole, prepared in Example 14, step (i), (143 mg, 0.3 mmol) in THF (1 mL) cooled to −78° C. under an atmosphere of argon was added n-BuLi (0.2 mL, 0.315 mmol) dropwise. The resulting mixture was stirred at −78° C. for 30 min, then a solution of benzaldehyde (0.035 mL, 0.33 mmol) in THF (0.5 mL) was added rapidly via a cannula. After 0.5 h the reaction was quenched with saturated NH4Cl (aq) and diluted with EtOAc (10 mL) and H2O (3 mL). The phases were separated and the aqueous was extracted 2×10 mL EtOAc. The pooled EtOAc was washed with brine (5 mL), dried with Na2SO4, decanted and concentrated under reduced pressure. The crude mixture was purified by silica gel chromatography (eluting with hexane:EtOAc 4:1) to give phenyl-{3-styryl-1-[2-(trimethyl-silanyl)-ethoxymethyl]-1H-indazol-6-yl}-methanol (68 mg, 50% yield). Rf sm=0.72; Rf p =0.39 (7:3 hexane:EtOAc); FTIR (thin film) 3368, 2952, 2893, 1621, 1478, 1449, 1374, 1307, 1249, 1216, 1078, 960, 859, 835 cm−1. MS (ESI) [M+H]/z Calc'd 457, found 457.

Workup

  1. customAfter 0.5 h the reaction was quenched with saturated NH4Cl (aq)
  2. additiondiluted with EtOAc (10 mL) and H2O (3 mL)
  3. customThe phases were separated
  4. extractionthe aqueous was extracted 2×10 mL EtOAc
  5. washThe pooled EtOAc was washed with brine (5 mL)
  6. dry with materialdried with Na2SO4
  7. customdecanted
  8. concentrationconcentrated under reduced pressure
  9. customThe crude mixture was purified by silica gel chromatography (eluting with hexane:EtOAc 4:1)

Sources & evidence

ORD record
ord-bbb630005b2d4e6bb9f9e73e46086645
Source dataset
uspto-grants-2003_03
Patent number
US06531491B1

Reaction notes

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