Réaction #2267060

Équation de réaction

6-hydroxy-2-naphthoic acid

NaOCl

sodium metabisulfite

HCl

4-hydroxybenzoic acid

NaI

NaOH

→

5-iodo-6-hydroxy-2-naphthoic acid

Solvants

MeOH

Conditions de réaction

Traitement

1. 1
   workup.ADDITIONwas added dropwise over 75 min
2. 2
   Extractionextracted with 40 ml of ether
3. 3
   LavageThe organic layer was washed with brine
4. 4
   Séchagedried over MgSO4
5. 5
   ConcentrationThe solution was concentrated to an off-white solid, that
6. 6
   Autrewas recrystallized from toluene/CH3OH

Mode opératoire

Mono-iodination of 6-hydroxy-2-naphthoic acid and 4-hydroxybenzoic acid was carried out following the procedure of Edgar and Falling (J. Org. Chem. 55, 5287, 1990). Thus, 0.75 gm of (4.34 mmol) was dissolved in 19 ml of MeOH and 1.04 gm of NaI (and 0.27 gm of NaOH was added. The solution was cooled to O▪C and aqueous NaOCl (4% solution, 12.9 ml) was added dropwise over 75 min. The resulting mixture was stirred for 1 hr at 0° C. and then treated with 7 ml of 10% aqueous sodium metabisulfite. The mixture was adjusted to pH 7 using 5% HCl and extracted with 40 ml of ether. The organic layer was washed with brine and dried over MgSO4. The solution was concentrated to an off-white solid, that was recrystallized from toluene/CH3OH to provide 0.42 gm of 5-iodo-6-hydroxy-2-naphthoic acid. Reaction of 6′-Tostylatractviloside with 1.2-ethylenediamine

Source