5-Amino-3H-thiazolo[4,5]pyrimidine-2-one → 5-Amino-3-(2',3,5'-tri-O-acetyl-beta-D-ribofuranosyl)-3H-thiazolo[4,5-d]pyrimidin-2-one

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Compound 86 (62 mg, 0.4 mmol), 1,2,3,5-tetra-O-acetyl-β-D-ribofuranose tetraacetate (128 mg, 0.4 mmol), and catalytic bis(p-nitrophenyl)hydrogen phosphate (13 mg, 0.04 mmol) were mixed and placed in a 500 ml flask. The reaction vessel was carefully placed under vacuum (˜5.0 mmHg) and lowered into an oil bath heated at 150° C. for 10 minutes. After cooling to room temperature, the solids were washed with ethyl acetate. The crude product was purified by flash column. (silica, 5 to 35% ethyl acetate gradient in chloroform) to yield 68 mg of compound 79 (40%) as a white solid as a white powder identical in all respects to material isolated in Example 38, step 2.

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