Water → Tert-butyl 4-[cis-3-(tert-butyl-diphenylsilanyloxy)cyclohexyl]-2-ethylbut-2-enoate

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Reaction Conditions

Reaction Steps

6.43 g of tert-butyl 2-(diethoxyphosphoryl)butyrate are dissolved in 90 ml of tetrahydrofuran, and 7.32 ml of a 2.7 M solution of n-butyllithium in n-hexane are added at −20° C. After 1 hour of stirring at −20° C., 4.36 g of [cis-3-(tert-butyl-diphenylsilanoxy)cyclohexyl]acetaldehyde, dissolved in 40 ml of tetrahydrofuran, are added dropwise. The reaction mixture is slowly warmed to room temperature. 50 ml of water are then added, and the mixture is extracted three times with in each case 200 ml of ethyl acetate. The combined organic phases are dried over magnesium sulfate and the solvent is then removed under reduced pressure. The residue is purified on silica gel using the mobile phase n-heptane:ethyl acetate=30:1. This gives 3.11 g of tert-butyl 4-[cis-3-(tert-butyl-diphenylsilanyloxy)cyclohexyl]-2-ethylbut-2-enoate as an oil. C32H46O3Si (506.81), Rf(n-heptane:ethyl acetate=5:1)=0.73.

Provenance & Evidence