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[5][6]]pyridine (XV).6-A solution of 7-chloro-3-/3-D-ribofuranosyl-3H-imidazo[4,5-6]pyridine (XII, 70 mg, 0.25 mmoles) in ethanol-water (5:10 ml) was hydrogenated at atmospheric pressure in the presence of MgO (9.8 mg, 0.2 mmole) and 5% Pd-C catalyst (10 mg). After the theoretical amount of hydrogen had been consumed, the catalyst and MgO were removed by filtration, and the filtrate was evaporated to dryness in vacuo.The residue was dissolved in water (1 ml) and filtered through dry Celite and the filtrate was refrigerated overnight. The crystals that formed were collected by filtration, washed, and dried in vacuo; yield 28 mg (45%), mp 226°(lit.6 220-222°), [ ]28 -78.0 ± 0.5°(0.99 g/100 ml of methanol). Thin layer chromatography using chloroform-methanol (9:1) as the eluent showed one spot which gave a positive Schiff-metaperiodate test: Xma* in m/¿ (e X 10~3):

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