Reaktion #2194020

Reaktionsgleichung

hydrochloric acid

t-butyl [(S)-p-tolylsulfinyl]acetate

t-butylmagnesium bromide

(R)-3-[(tetrahydro-2H-pyran-2-yl)oxy]-tetradecanal

→

t-butyl 3-hydroxy-(R)-5-[(tetrahydro-2H-pyran-2-yl)oxy]-2-[(S)-p-tolylsulfinyl]-hexadecanoate

Ausbeute 67.0%

Lösungsmittel

ether

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeremained below -70° C
2. 2
   workup.ADDITIONwere added dropwise
3. 3
   Sonstigethe solvent was evaporated off
4. 4
   ExtraktionThe reaction mixture remaining behind was extracted with ether
5. 5
   Sonstigethe ethereal phase was dried
6. 6
   Sonstigeevaporated

Vorschrift

(G)(a) 16.5 g of t-butyl [(S)-p-tolylsulfinyl]acetate were dissolved in a mixture of 600 ml of ether and 60 ml of THF and cooled to -78° C. 43 ml of t-butylmagnesium bromide were then added dropwise in such a manner that the temperature remained below -70° C. After stirring at -78° C. for 1 hour 13.4 g of (R)-3-[(tetrahydro-2H-pyran-2-yl)oxy]-tetradecanal in 100 ml of THF were added dropwise. After 2 hours at -78° C. the reaction mixture was hydrolyzed with 2N hydrochloric acid and the solvent was evaporated off. The reaction mixture remaining behind was extracted with ether and the ethereal phase was dried and evaporated. After chromatography on silica gel there were obtained 14.9 g of t-butyl 3-hydroxy-(R)-5-[(tetrahydro-2H-pyran-2-yl)oxy]-2-[(S)-p-tolylsulfinyl]-hexadecanoate (67% yield). m.p. 97°-98° C.

Quelle