Aluminium lithium hydride → 2-(4-Bromo-2-methoxyphenyl)-2-methylpropan-1-ol

Temperatur

0 °C

To a stirred solution of ethyl 2-(4-bromo-2-methoxyphenyl)-2-methylpropanoate (110 mg, 0.36 mmol) in THF (4 mL) was added 1M solution of lithium aluminum hydride in THF (0.4 mL, 0.4 mmol) at −60° C. and the reaction mixture was warmed up to 0° C. in 40 min (the starting material is still present by TLC) and then allowed to stir at room temperature for 4 hours—now the starting material is consumed (TLC). A solution of sodium hydroxide (105 mg) in water (0.2 mL) was added and the mixture was stirred at room temperature for 30 min. Then 3 mL of methylene chloride (3 mL), silica gel (1 g), and anhydrous magnesium sulfate (1 g) were added and the mixture was stirred for 2 hours. Solids were filtered off and mother liquor was concentrated to give the title compound (85 mg). By GCMS, this is a mixture of the target primary alcohol and de-brominated primary alcohol (40% of the desired product by GCMS). This mixture was used for the next step without purification. GCMS (ES+) 258 (M+).

1. customis consumed (TLC)
2. additionA solution of sodium hydroxide (105 mg) in water (0.2 mL) was added
3. stirringthe mixture was stirred at room temperature for 30 min
4. additionThen 3 mL of methylene chloride (3 mL), silica gel (1 g), and anhydrous magnesium sulfate (1 g) were added
5. stirringthe mixture was stirred for 2 hours
6. filtrationSolids were filtered off
7. concentrationmother liquor was concentrated

ORD-Eintrag

ord-b336b8c41cd047cebcccf0d5fa5e34a5

Quelldatensatz

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08889730B2