Potassium Carbonate → 2-(4-(((Benzyloxy)carbonyl)amino)-2-oxopyrimidin-1(2H)-yl)acetic acid

Participants

Reaction Conditions

Reaction Steps

In a three necked round bottomed flask equipped with mechanical stirring and nitrogen coverage was placed methyl bromacetate (7.82 ml; 82.6 mmol) and a suspension of N4 -benzyloxycarbonyl-cytosine (9, 21.0 g; 82.6 mmol) and potassium carbonate (11.4 g; 82.6 mmol) in dry DMF (900 ml). The mixture was stirred vigorously overnight, filtered, and evaporated to dryness, in vacuo. Water (300 ml) and 4N hydrochloric acid (10 ml) were added, the mixture was stirred for 15 minutes at 0° C., filtered, and washed with water (2×75 ml). The isolated precipitate was treated with water (120 mt), 2N sodium hydroxide (60 ml), stirred for 30 min, filtered, cooled to 0° C., and 4N hydrochloric acid (35 ml) was added. The title compound was isolated by filtration, washed thoroughly with water, recrystallized from methanol (1000 ml) and washed thoroughly with ether. This afforded 7.70 g (31%) of pure compound. The mother liquor from the recrystallization was reduced to a volume of 200 ml and cooled to 0° C. This afforded an additional 2.30 g of a material that was pure by tlc but had a reddish color. M.p. 266°-274° C. Anal. for C14H13N3O5. Found (calc.); C: 55.41(55.45); H: 4.23(4.32); N: 14.04(13.86). 1H-NMR (90 MHz; DMSO-d6): 8.02 ppm (d,J=7.32 Hz, 1H,H-6); 7.39 (s,5H, Ph); 7.01 (d,J=7.32 Hz,1H,H-5); 5.19 (s,2H, PhCH2 --); 4.52 (s,2H).

Provenance & Evidence