3-Pyridinecarboxaldehyde → [4-(Tert-butyldimethylsilyloxymethyl)-phenyl]-pyridin-3-yl-methanol

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Dissolve 4-(tert-butyldimethylsilyloxymethyl)bromobenzene (1 g, 3.319 mmol, prepared by following the procedure described in J. Am. Chem. Soc. 1995, 117, 704-714) in anhydrous THF (20 mL). Cool the solution to −78° C., add n-BuLi (4.149 mL, 6.638 mmol, 1.6M solution in hexane) and stir at this temperature for 1.5 h. Warm to −60° C., stir for an additional 30 min and add 3-pyridine carboxaldehyde. Allow the reaction mixture to warm gradually to room temperature and stir overnight. Add brine and extract with EtOAc. Dry the organic phase over Na2SO4, filter and concentrate in vacuo. Purify the crude mixture by chromatography on silica gel eluting sequentially with hexane and EtOAc to give the desired intermediate (380 mg, 35%). MS (ES+) m/z: 330 (M+H)*.

Herkunft & Nachweise