(S)-methyl3-(benzyloxy)-2-methylpropanoate → (S)-3-(benzyloxy)-2-methylpropan-1-ol

Temperature

27.5 °C

An oven dried three-necked 2 L round bottom flask was equipped with a mechanical stirrer, a reflux condenser and a 500 mL constant pressure addition funnel. The flask was charged with a solution of 62.252 g (0.299 mol) of methyl (S)-3-benzyloxy-2-methylpropanoate in 600 mL of anhydrous THF, and a 1.0 M solution of lithium aluminum hydride (300 mL; 0.3 mol) was transferred into the dropping funnel via a cannula. Stirring was started and the lithium aluminum hydride solution was added over 45 minutes to the reaction under an N2 atmosphere while the temperature of the reaction mixture was maintained between 25-30° C. using an external ice-water bath. After the addition was complete, the reaction was stirred an additional 6 h at room temperature at which point TLC analysis (20% EtOAc-hexane) indicated complete reaction. The reaction mixture was then cooled with an external ice-water bath and quenched by serial addition of 11.4 mL water, 11.4 mL of 15% aqueous NaOH, and 34.2 mL water. The reaction mixture was then filtered, the solids were washed with EtOAc, the filtrate and washings were combined and evaporated in vacuo. The residue was redissolved in EtOAc, washed with 10% aqueous NaHSO4, saturated NaCl, dried (MgSO4), filtered and evaporated. The residue was purified by Kugelrohr distillation to afford 47.67 g (89%) of the title compound as an oil.

1. customAn oven dried three-necked 2 L round bottom flask was equipped with a mechanical stirrer, a reflux condenser and a 500 mL constant pressure addition funnel
2. additionAfter the addition
3. customreaction
4. temperatureThe reaction mixture was then cooled with an external ice-water bath
5. customquenched by serial addition of 11.4 mL water, 11.4 mL of 15% aqueous NaOH, and 34.2 mL water
6. filtrationThe reaction mixture was then filtered
7. washthe solids were washed with EtOAc
8. customevaporated in vacuo
9. dissolutionThe residue was redissolved in EtOAc
10. washwashed with 10% aqueous NaHSO4, saturated NaCl
11. dry with materialdried (MgSO4)
12. filtrationfiltered
13. customevaporated
14. distillationThe residue was purified by Kugelrohr distillation

ORD record

ord-8e13d71fe2494999aadc3e62e476d556

Source dataset

uspto-grants-2001_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06180642B2