Iopanoic Acid → Ethyl iopanoate

Temperatur

150 °C

2 g (3.5 mmol) of iopanoic acid was dissolved in 50 ml absolute ethanol, and 0.4 ml (5,25 mmol) thionyl chloride was added. The reaction was refluxed for 3 hours. After cooling, the reaction mixture was evaporated and reconstituted in 100 ml methylene chloride. The organic mixture was washed twice with 25 ml 5% NaOH and twice with 25 ml water. The methylene chloride layer was dried over MgSO4 and evaporated to dryness, yielding 1.73 g of ethyliopanoate (82.4%). The structure was provided by 1H nuclear magnetic resonance and mass spectrometry (M+ 599). The radioisotope exchange reaction was carried out using a known procedure with some modification (Zupon, et al., 1983; Kroschwitz, 1989). Briefly, 10 mg of the ester and 0.3 ml of tetrahydrofuran were placed in a vial and treated with 1.6 mCi of [131I]sodium iodide (in 100 μl of 0.1M sodium borate buffer). Pivalic acid (25 mg) was then added. The reaction vial was sealed and heated at 150° C. for 1.5 hours. The vial was cooled and the ethyliopanoate reconstituted in methylene chloride (0.1 ml) and chromatographed on a silica gel column with methylene chloride/methanol (9:1) as the eluent. This yielded 0.54 mCi ethyliopanoate (34%). Radiochemical purity was determined by co-chromatography on a silica gel plate eluted with methylene chloride methanol (9:1); unlabeled ester served as the standard, with a retardation factor of 0.80.

1. temperatureThe reaction was refluxed for 3 hours
2. temperatureAfter cooling
3. customthe reaction mixture was evaporated
4. washThe organic mixture was washed twice with 25 ml 5% NaOH and twice with 25 ml water
5. dry with materialThe methylene chloride layer was dried over MgSO4
6. customevaporated to dryness
7. customyielding 1.73 g of ethyliopanoate (82.4%)
8. customThe structure was provided by 1H nuclear magnetic resonance and mass spectrometry (M+ 599)
9. customThe radioisotope exchange reaction
10. customThe reaction
11. customvial was sealed
12. temperatureThe vial was cooled
13. customchromatographed on a silica gel column with methylene chloride/methanol (9:1) as the eluent
14. washeluted with methylene chloride methanol (9:1)

ORD-Eintrag

ord-f5e896eb294243469beee4e654dd3f72

Quelldatensatz

uspto-grants-1996_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05484584