تفاعل #5364

معادلة التفاعل

KOH

methyl oleate

diiodomethane

HCl

→

cis-8-(2 -octylcyclopropyl) octanoic acid

المذيبات

tetrahydrofuran methanol water

ether

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةThe reaction mixture is refluxed overnight
2. 2
   استخلاصextracted three times with ether
3. 3
   غسيلwashed with brine
4. 4
   تجفيفdried over MgSO4
5. 5
   ترشيحfiltered
6. 6
   تركيزconcentrated in vacuo
7. 7
   أخرىto give an oil
8. 8
   أخرىto give an oil free of starting material
9. 9
   أخرىthe solvents are evaporated
10. 10
    استخلاصextracted three times with ether
11. 11
    استخلاصextracted three times with ether
12. 12
    غسيلwashed with brine
13. 13
    تجفيفdried over, MgSO4
14. 14
    ترشيحfiltered
15. 15
    تركيزconcentrated in vacuo

الإجراء التجريبي

To 2.2 g of zinc-copper couple in 30 mL of dry ether is added 5.7 mL (16.9 mmol) of methyl oleate and 5.4 mL (70.7 mmol) of diiodomethane. The reaction mixture is refluxed overnight, cooled to room temperature, poured into 1.0N HCl, and extracted three times with ether. The organic layers are combined, washed with brine, dried over MgSO4, filtered, and concentrated in vacuo to give an oil. The oil is subjected to the conditions described in Example 51 above to give an oil free of starting material. The oil is taken up in a combination of tetrahydrofuran:methanol:water (2:1:1), followed by the addition of 4.0 g of 85% KOH. After 4 hours stirring at room temperature, the solvents are evaporated, the residue taken up in 0.1N KOH, and extracted three times with ether. The aqueous phase is acidified using concentrated HCl and extracted three times with ether. The ether layers are combined, washed with brine, dried over, MgSO4, filtered, and concentrated in vacuo to give cis-8-(2 -octylcyclopropyl) octanoic acid. Spectral data follows: 1H NMR (CDCl3, 400 MHz) δ 2.35 (t, 2H, J=7.0 Hz, CH2C=O), 0.6-1.7 (m, 33H).

المصدر