1,1-Dibromoethane → 1-Bromo-3-[7-bromo-1-[2-(tert-butyl-dimethyl-silanyloxy)-propyl]-1H-indazol-6-yloxy]-propan-2-ol

HRID 1815955Notes

Reaction equation

[Br:1]C(Br)C.[Mg].[Br:6][C:7]1[C:8]([O:27][CH2:28][CH:29]2[CH2:31][O:30]2)=[CH:9][CH:10]=[C:11]2[C:15]=1[N:14]([CH2:16][CH:17]([O:19][Si:20]([C:23]([CH3:26])([CH3:25])[CH3:24])([CH3:22])[CH3:21])[CH3:18])[N:13]=[CH:12]2>C1COCC1>[Br:1][CH2:31][CH:29]([OH:30])[CH2:28][O:27][C:8]1[C:7]([Br:6])=[C:15]2[C:11]([CH:12]=[N:13][N:14]2[CH2:16][CH:17]([O:19][Si:20]([C:23]([CH3:26])([CH3:25])[CH3:24])([CH3:22])[CH3:21])[CH3:18])=[CH:10][CH:9]=1

Participants

Conditions

Temperature: 50 °C

Procedure

Dibromoethane (1.09 mL, 12.6 mmol) was added dropwise to a suspension of magnesium powder (0.81 g, 33.5 mmol) in anhydrous THF (150 mL) under nitrogen. During this period the mixture was heated at about 50° C. until gas evolution was observed and then allowed to cool to 40° C. Additional dibromoethane (0.05 mL) was added and the mixture was heated at reflux for 20 min and placed in an ice bath. To the cooled mixture was added a solution of the product from Step D (3.70 g, 8.38 mmol) in THF (50 mL). After stirring for 20 min at ambient temperature, the reaction was quenched with a saturated aqueous solution of ammonium chloride (200 mL) and the mixture was extracted with EtOAc (2×150 mL). Evaporation of the extracts gave a crude oil (3.78 g, 86%): LC/MS (+APCI) m/z 521, 523, 525 (M+H).

Workup

temperatureto cool to 40° C
temperaturethe mixture was heated
temperatureat reflux for 20 min
customplaced in an ice bath
customthe reaction was quenched with a saturated aqueous solution of ammonium chloride (200 mL)
extractionthe mixture was extracted with EtOAc (2×150 mL)
customEvaporation of the extracts

Sources & evidence

ORD record: ord-37939bb1304744f0b3b26d1b7ca2fa55
Source dataset: uspto-grants-2005_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06881749B2

Reaction notes

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