Réaction #93914

Équation de réaction

sodium hydride

dimethyl-2-methylsulfonylazelate

1-iodo-4-acetoxynonane

→

title compound

Rendement 129.3%

8-methylsulfonyl-12-hydroxyheptadecanoic acid

Rendement 129.3%

Solvants

dimethylformamide

Conditions de réaction

Traitement

1. 1
   Lavageis washed by decantation with petroleum ether
2. 2
   Autreto remove the mineral oil
3. 3
   workup.ADDITIONadded dropwise at ambient temperature under a nitrogen atmosphere
4. 4
   Températurecooled to ~10° C.
5. 5
   workup.ADDITIONadded at such a rate as
6. 6
   Températureto maintain an internal temperature less than 35° C
7. 7
   workup.WAITAfter 19 hours at ambient temperature
8. 8
   Filtrationthe reaction mixture is filtered
9. 9
   LavageCollected sodium iodide (17.1 g.) is washed with ether
10. 10
    ConcentrationThe combined filtrate and washings are concentrated in vacuo at ~100° C.
11. 11
    Autreyielding a residual oil which
12. 12
    Autreis partitioned between ether and dilute hydrochloric acid
13. 13
    ExtractionThe organic extract
14. 14
    Lavageis washed with water and saturated brine
15. 15
    Séchagedried over magnesium sulfate
16. 16
    Autreevaporated in vacuo

Mode opératoire

A suspension of 57% sodium hydride/mineral oil (3.84 g., 0.091 mole) is washed by decantation with petroleum ether to remove the mineral oil. The residual solid is suspended in dry dimethylformamide (100 ml.) and treated with a solution of dimethyl-2-methylsulfonylazelate (23.5 g., 0.08 mole) in dry dimethylformamide (60 ml.) added dropwise at ambient temperature under a nitrogen atmosphere. The resulting solution is stirred for 1 hour at room temperature, cooled to ~10° C., and treated with 1-iodo-4-acetoxynonane (30 g., 0.096 mole) added at such a rate as to maintain an internal temperature less than 35° C. After 19 hours at ambient temperature, the reaction mixture is filtered. Collected sodium iodide (17.1 g.) is washed with ether. The combined filtrate and washings are concentrated in vacuo at ~100° C. yielding a residual oil which is partitioned between ether and dilute hydrochloric acid. The organic extract is washed with water and saturated brine, dried over magnesium sulfate and evaporated in vacuo leaving the title compound as a viscous oil (37.7 g., 98%), pmr (CDCl3) δ 2.0 (s, 3H), 3.0 (s, 3H), 3.65 (s, 3H), 3.81 (s, 3H) and 4.9 (b, H).

Source