Reaktion #465929

Reaktionsgleichung

iodine

stannane

tert-butyl (E)-6-[4-[4-[[(4-cyclohexylbutyl)amino]carbonyl]-2-oxazolyl]phenyl]-6-(tributylstannyl)hex-5-enoate

→

pale yellow oil

tert-Butyl (E)-6-[4-[4-[[(4-Cyclohexylbutyl)amino]carbonyl]-2-oxazolyl]phenyl]-6-iodohex-5-enoate

Lösungsmittel

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONaddition funnel over 30 minutes
2. 2
   SonstigeThe ice bath was removed
3. 3
   workup.ADDITIONSaturated sodium bisulfite solution (50 mL) was added
4. 4
   Extraktionthe organics were extracted three times with ethyl acetate
5. 5
   TrocknenThe combined extracts were dried over MgSO4
6. 6
   FiltrationFiltration and solvent removal
7. 7
   Sonstigegave a yellow oil which
8. 8
   Sonstigewas purified by radial chromatography (2 mm plate, 10% ethyl acetate in hexanes)

Vorschrift

A 2-necked 50 mL round bottom flask was charged under nitrogen atmosphere with a stir bar, the above alkyne (148.6 mg, 0.302 mmol), and tetrakis(triphenylphosphine)palladium(O) (17.4 mg, 0.0015 mmol). Anhydrous toluene (5 mL) was added via syringe, and the mixture was stirred until the two solids dissolved. A 2 mL solution of tributyltin hydride (0.392 mmol) in anhydrous toluene was added, and the reaction stirred at room temperature for 30 minutes. The solution was then transferred to a dry 50 mL round bottom flask and the toluene was removed in vacuo to afford tert-butyl (E)-6-[4-[4-[[(4-cyclohexylbutyl)amino]carbonyl]-2-oxazolyl]phenyl]-6-(tributylstannyl)hex-5-enoate as a residue which was used directly. The stannane was dissolved in 10 mL anhydrous THF and the flask was cooled to 0° C. in an ice bath. A 10 mL solution of iodine (84.2 mg, 0.3318 mmol) in anhydrous THF was added dropwise via pressure equalizing addition funnel over 30 minutes. The ice bath was removed and the reaction stirred at room temperature for 2 hours. Saturated sodium bisulfite solution (50 mL) was added, and the organics were extracted three times with ethyl acetate. The combined extracts were dried over MgSO4. Filtration and solvent removal gave a yellow oil which was purified by radial chromatography (2 mm plate, 10% ethyl acetate in hexanes) to give 193.6 mg of a pale yellow oil: 1H NMR (CDCl3) δ8.24 (s, 1H), 8.00 (d, 2H), 7.41 (d, 2H), 7.05 (broad t, 1H), 6.52 (t, 1H), 3.45 (q, 2H), 2.15 (q, 2H), 2.04 (q, 2H), 1.70 (m, 7H), 1.40 (m, 9H), 1.23 (m, 6H), 0.93 (m, 4H); IR (cm-1) 2926, 2853, 1721, 1664, 1599. High Resolution MS Accurate mass calculated for C30H42IN2O4 : 621.2189. Found: 621.2183.

Quelle