tert-Butyldimethylsilyl trifluoromethanesulphonate → (S)-2,3-bis(tert-butyldimethylsilyloxy)propyl 4-methoxybenzoate

Temperatur

0 °C

To a 1.0 L RB flask containing (R)-2,3-dihydroxypropyl 4-methoxybenzoate (4.800 g, 21.2 mmol; according to the procedure described in Corey, E. J.; Guzman-Perez, A.; and Noe, M. C. J. Am. Chem. Soc. 1995, 117, 10805-10816) was added DCM (100 mL ) and the mixture was allowed to stir at 0° C. for 5 minutes. At this time, TEA (8.87 ml, 63.7 mmol) was added and the reaction was allowed to stir for 5 min before the dropwise addition of tert-butyldimethylsilyl triflate (10.2 ml, 44.6 mmol) via syringe. The reaction was allowed to stir for 1 h and then quenched by pouring into HCl (0.1 N, 100 mL). The aqueous layer was extracted with DCM (2×75 mL). The combined organics were washed with HCl (0.1 N, 2×150 mL), sodium bicarbonate (1×150 mL, sat), brine, dried sodium sulfate. The concentrated solution was passed through a plug of silica gel to and concentrated to give the title compound as a colorless oil.

1. stirringto stir for 1 h
2. customquenched
3. additionby pouring into HCl (0.1 N, 100 mL)
4. extractionThe aqueous layer was extracted with DCM (2×75 mL)
5. washThe combined organics were washed with HCl (0.1 N, 2×150 mL), sodium bicarbonate (1×150 mL, sat), brine, dried sodium sulfate
6. concentrationconcentrated

ORD-Eintrag

ord-76baa42f6a1f4460a6bf89f062e04397

Quelldatensatz

uspto-grants-2010_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07745484B2