Urea → HCID 22505874, compound

Participants

Reaction Steps

264 mg (1 mmol) 3-(4-Hydroxy-5-hydroxymethyl -tetrahydrofuran-2-yl)-2,6-dihydroxy-5-chloro-pyrazine from example 10 was subjected to a deamination reaction in a mixture of 50 ml 80% acetic acid and 700 mg (10 mmol) NaNO2. After standing for 5 hours at RT, the reaction was almost complete according to TLC. 2 g urea was added to the reaction mixture to destroy excess nitrite and stirred for a further three hours at RT. Afterwards the solution was applied to an activated carbon column (Carboraffin C, ca. 50 ml volume), adequately washed and the desired product was eluted with ethanol/water/ammonium. 230 mg (ca. 87%) of a viscous oil resulted after evaporation which was used in the next stage without further purification.

Provenance & Evidence