tert-Butyldimethylsilyl chloride → (1S,3aS,5R,7aR)-1-hydroxymethyl-5-(3-tert-butyldimethylsilyloxymethylphenyl)-7a-methylperhydroinden-3a,5-diol

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a suspension of 60.0 g of 3-(tert-butyldimethylsilyloxymethyl)bromobenzene (prepared from tert-butyldimethylchlorosilane and 3-bromobenzyl alcohol according to the procedure described by Kendall P. M. et al., J. Org. Chem., 1979, 44, 1421) in 500 ml of anhydrous THF cooled to -78° C., 131 ml of 1.6M n-butyllithium in n-hexane were added under a nitrogen atmosphere and the resulting mixture was stirred for 2.5 hrs. A solution of 6.30 g of (1S,3aS,7aR)-1-hydroxymethyl-3a-hydroxy-7a-methyl-5-perhydroindenone in 60 ml of anhydrous THF was added. After 1 hr the reaction mixture was allowed to warm to 0° C., and cautiously quenched with 300 ml of 5% aqueous NaH2PO4.H2O and extracted with ethyl acetate. The organic layer was dried over sodium sulfate and evaporated to dryness under reduced pressure. The residue was purified by flash-chromatography (SiO2) with n-hexane/acetone/chloroform 6:2:2 as the eluant to give 9.62 g of (1S,3aS,5R,7aR)-1-hydroxymethyl-5-(3-tert-butyldimethylsilyloxymethylphenyl)-7a-methylperhydroinden-3a,5-diol as a white foam.

Herkunft & Nachweise