Reacción #1253200

Ecuación de reacción

1 -(3,5 -Diamino-6-chloropyrazinoyl)-2-methyl-pseudothiourea hydroiodide

N-(benzyloxycarbonyloxy) succinimide

→

N-Cbz-1-(3,5-diamino-6-chloropyrazinoyl)-2-methyl-pseudothiourea

Disolventes

DMF

DMF

triethylamine

Condiciones de reacción

Tratamiento posterior

1. 1
   ConcentraciónAfter this time, the reaction mixture was concentrated under reduced pressure
2. 2
   workup.ADDITIONSilica gel (25 g) was added to the solution
3. 3
   Otrothe solvent was evaporated
4. 4
   Otroto leave the silica gel
5. 5
   Otrowas purified by flash chromatography on a FlashElute™ system from Elution Solution (P.O. Box 5147, Charlottesville, Va. 22905)

Procedimiento

1 -(3,5 -Diamino-6-chloropyrazinoyl)-2-methyl-pseudothiourea hydroiodide (II, 494 mg, 1.27 mmol) was dissolved in a mixture of anhydrous DMF(10 mL), and triethylamine (3 mL) followed by treatment with N-(benzyloxycarbonyloxy) succinimide (470 mg, 1.7 mmol) dissolved in DMF(3 mL). The reaction mixture was stirred overnight at room temperature. After this time, the reaction mixture was concentrated under reduced pressure and the residue suspended in ethyl acetate (30 mL). Silica gel (25 g) was added to the solution and the solvent was evaporated to leave the silica gel impregnated with the crude product that was purified by flash chromatography on a FlashElute™ system from Elution Solution (P.O. Box 5147, Charlottesville, Va. 22905) using a 90 g silica gel cartridge (eluent:hexanes, ethyl acetate=1:2). The purified N-Cbz-1-(3,5-diamino-6-chloropyrazinoyl)-2-methyl-pseudothiourea (III) was yield);1H NMR (360 MHz, DMSO-d6) δ2.33 (s, 3H), 2.61 (s, 3H), 4.99 (s, 2H), 7.39 (m, 10H), 13.7 (s, 1H); API MS m/z=395 [C15H15ClN6O3S+H]30; LC/MS (Method A)>99%, tr=10.1 min.

Fuente