Reacción #9201

Ecuación de reacción

N-methylmorpholine

N-Ethyl-N′-(6-nitro-1,3-benzothiazol-2-yl)urea

formaldehyde

MeNH2

→

1-Ethyl-5-methyl-3-(6-nitro-1,3-benzothiazol-2-yl)-1,3,5-triazinan-2-one

Disolventes

EtOH H2O

MeOH

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe slurry was then cooled to room temperature
2. 2
   Filtraciónfiltered
3. 3
   Lavadowashed well with water
4. 4
   OtroAfter drying in vacuo
5. 5
   Otroabout 3.2 grams was isolated
6. 6
   Otro1H NMR 1.13 (t, 3H, J=7.1 Hz), 2.55 (s, 3H), 3.38 (q, 2H, J=7.1 Hz), 4.39 (s, 2H), 5.16 (s, 2H), 7.81 (d, 1H, J=8.9 Hz), 8.22 (dd, 1H, J=2.4 Hz, J=8.9 Hz), 8.95 (d, 1H, J=2.4 Hz) LC/MS=3.33 min, 322 (MH+), 320(M−H−)

Procedimiento

N-Ethyl-N′-(6-nitro-1,3-benzothiazol-2-yl)urea (2.8 g) was suspended in about 100 mL 1:1 EtOH/H2O at room temperature. About 8 mL of a 37% aqueous solution of formaldehyde is added followed by addition of about 15 mL of a 2M solution of MeNH2 in MeOH, then about 2.2 mL of N-methylmorpholine. The solution was warmed to about 80° C. then allowed to stir for about 16 hours. The slurry was then cooled to room temperature, filtered and washed well with water. After drying in vacuo, about 3.2 grams was isolated. 1H NMR 1.13 (t, 3H, J=7.1 Hz), 2.55 (s, 3H), 3.38 (q, 2H, J=7.1 Hz), 4.39 (s, 2H), 5.16 (s, 2H), 7.81 (d, 1H, J=8.9 Hz), 8.22 (dd, 1H, J=2.4 Hz, J=8.9 Hz), 8.95 (d, 1H, J=2.4 Hz) LC/MS=3.33 min, 322 (MH+), 320(M−H−).

Fuente