Reacción #1539620

Ecuación de reacción

EDCI HCl

3-(3-iodo-4-hydroxyphenyl)-2-propenoic acid

tyrosine ethyl ester

NMP

NMP

→

3-(3-iodo-4-hydroxyphenyl)-2-propenoic acid tyrosine ethyl ester

Disolventes

ethyl acetate

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroTo a 250 mL 3-necked round bottomed flask equipped with an overhead stirrer
2. 2
   Otrois obtained
3. 3
   TemperaturaThe flask may be cooled in an ice-water bath
4. 4
   OtroThe cooling bath may be removed after 2.5 hours
5. 5
   Otrothe reaction
6. 6
   workup.STIRRINGstirring may
7. 7
   Temperaturabe maintained for 15 more minutes
8. 8
   OtroThe crude may then be transferred into a 500 mL separatory funnel
9. 9
   Extracciónextracted once with 75 mL of brine
10. 10
    SecadoThe organic phase may be dried over magnesium sulfate
11. 11
    workup.ADDITIONtreated with activated carbon
12. 12
    Filtraciónfiltered
13. 13
    Concentraciónconcentrated to a thick syrup, which
14. 14
    Otromay crystallize into a solid mass after a few hours
15. 15
    OtroThe product may be triturated in methylene chloride using mechanical stirring
16. 16
    Filtraciónit may be recovered by filtration
17. 17
    Otrodried under a nitrogen stream

Procedimiento

To a 250 mL 3-necked round bottomed flask equipped with an overhead stirrer may be added 17.0 g of 3-(3-iodo-4-hydroxyphenyl)-2-propenoic acid, 12.25 g (0.0585 moles) or tyrosine ethyl ester, and 25 mL of NMP. The mixture may be stirred until a clear solution is obtained. The flask may be cooled in an ice-water bath, the 11.84 g (0.0619 moles) of EDCI HCl may be added in one portion, followed by 15 mL of NMP. The cooling bath may be removed after 2.5 hours, and the reaction may be allowed to continue overnight at room temperature. 71 mL of ethyl acetate may be added, and stirring may be maintained for 15 more minutes. The crude may then be transferred into a 500 mL separatory funnel, and extracted once with 75 mL of brine, then with two aliquots (75 and 35 mL) of 3% NaHCO3/14% NaCl, followed by 35 mL aliquots of 0.4M HCl/14% NaCl, and finally with brine. The organic phase may be dried over magnesium sulfate and treated with activated carbon, filtered and concentrated to a thick syrup, which may crystallize into a solid mass after a few hours. The product may be triturated in methylene chloride using mechanical stirring, then it may be recovered by filtration and dried under a nitrogen stream followed by high vacuum.

Fuente