反应详情

Swern reagent was prepared at -70° C. by adding slowly 1.70 ml of abs. DMSO to 0.947 ml of oxalylchloride, dissolved in 27 ml of CH2Cl2. 15 minutes later, 3.43 g of (S)-2-[(1R,4aR,5S,8aR)-5-(tert-butyldimethyl-silanyloxy)-8a-methyl-decahydro-naphthalen-1-yl]-propan-1-ol (synthesis described in ref. Ex. 12), dissolved in 10 ml of CH2Cl2, were slowly added. After 0.25 h, 4.8 ml of NEt3 were added dropwise and the temperature allowed to reach -30° C. The reaction was quenched by pouring onto crushed ice/NH4Cl, extracted with ether, washed with water and brine, dried over sodium sulfate and evaporated to dryness. Flash chromatography (SiO2, hexane/AcOEt=97/3) afforded (S)-2-[(1R,4aR,5S,8aR)-5-(tert-butyldimethyl-silanyloxy)-8a-methyl-decahydro-naphthalen-1-yl]-propionaldehyde as colourless oil.

1. additionby adding slowly 1.70 ml of abs
2. additionwere slowly added
3. customto reach -30° C
4. customThe reaction was quenched
5. additionby pouring
6. customonto crushed ice/NH4Cl
7. extractionextracted with ether
8. washwashed with water and brine
9. dry with materialdried over sodium sulfate
10. customevaporated to dryness