Reacción #75995

Ecuación de reacción

benzyl ethanimidothioate hydrochloride

4-(3-aminophenyl)-4,5-dihydro-1,3-thiazol-2-ylamine

benzyl ethanimidothioate

→

[3-(2-amino-4,5-dihydrothiazol-4-yl)phenyl]-(1-iminoethyl)amine

Rendimiento 58.9%

Disolventes

ethanol

ethanol

water

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.WAITfor 2 hours at a temperature in the region of 20° C
2. 2
   Otrothe reaction
3. 3
   Temperaturaafter which the mixture is maintained at a temperature in the region of 45° C. for 24 hours
4. 4
   OtroThe reaction medium is evaporated under reduced pressure (5 kPa) at a temperature in the region of 40° C
5. 5
   OtroThe residue obtained
6. 6
   Lavadothe solution is washed with 30 cm3 of dichloromethane
7. 7
   ConcentraciónThe aqueous solution is concentrated under the above conditions
8. 8
   Otrothe solid obtained
9. 9
   Otrois then triturated from diethyl ether
10. 10
    Filtraciónfiltered
11. 11
    Otroair-dried
12. 12
    Otropurified by chromatography at atmospheric pressure on a column of silica gel (particle size 40-63μ; mass 63 g)
13. 13
    Lavadoeluting with a dichloromethane/methanol/aqueous ammonia mixture (12/3/0.5 by volume)
14. 14
    workup.ADDITIONThe fractions containing the expected product
15. 15
    Otroare collected
16. 16
    Otroevaporated under reduced pressure (5 kPa) at a temperature in the region of 40° C

Procedimiento

0.15 g of benzyl ethanimidothioate hydrochloride and then 5 cm3 of ethanol are added, under an inert atmosphere and at a temperature in the region of 0° C., to a stirred solution of 0.14 g of 4-(3-aminophenyl)-4,5-dihydro-1,3-thiazol-2-ylamine in 15 cm3 of ethanol. The mixture is stirred for 1 hour at about 0° C. and then for 2 hours at a temperature in the region of 20° C. A further 0.030 g of benzyl ethanimidothioate is added to complete the reaction, after which the mixture is maintained at a temperature in the region of 45° C. for 24 hours. The reaction medium is evaporated under reduced pressure (5 kPa) at a temperature in the region of 40° C. The residue obtained is taken up in 30 cm3 of water and the solution is washed with 30 cm3 of dichloromethane. The aqueous solution is concentrated under the above conditions and the solid obtained is then triturated from diethyl ether, filtered, air-dried and purified by chromatography at atmospheric pressure on a column of silica gel (particle size 40-63μ; mass 63 g), eluting with a dichloromethane/methanol/aqueous ammonia mixture (12/3/0.5 by volume). The fractions containing the expected product are collected. These fractions are combined and then evaporated under reduced pressure (5 kPa) at a temperature in the region of 40° C. 0.100 g of [3-(2-amino-4,5-dihydrothiazol-4-yl)phenyl]-(1-iminoethyl)amine is obtained in the form of a white solid melting at 180° C. 1H NMR spectrum (250 MHz, (CD3)2SO-d6, with addition of a few drops of CD3COOD-d4, δ in ppm): 2.28 (unres. mult.: 3H); 3.18 (dd, J=12.5 and 8.5 Hz: 1H); 3.80 (dd, J=12.5 and 8.5 Hz: 1H); 5.30 (t, J=8.5 Hz: 1H); 7.21 (broad d, J=8.5 Hz: 1H); 7.27 (broad s: 1H); 7.36 (broad d, J=8.5 Hz: 1H); 7.49 (broad t, J=8.5: Hz: 1H).

Fuente