反应详情

A mixture of 5-(2-chloro-phenylethynyl)-2-methylsulfanyl-pyrimidine-4-carboxylic acid methyl ester (5.0 g, 9.4 mmol) (prepared in a manner similar to that described above), 50% (v/v) trifluoroacetic acid in dichloromethane (15 ml) and water (1 ml) was stirred in a heavy-walled Smith process vial and irradiated to 120° C. for 45 min. The mixture was evaporated in vacuo to dryness and the residual oil was purified by flash column chromatography over silica using a 3:7 mixture of hexane and dichloromethane as eluant. Appropriate fractions were combined and the solvents removed in vacuo to give 6-(2-chlorophenyl)-2-methylsulfanylpyrano[3,4-d]pyrimidin-8-one (3.15 g) as a pale yellow oil. 250 MHz 1H-nmr (CDCl3) δ (ppm): 2.65 (s, 3H) (—SCH3), 6.95 (s, 1H) (═CHAr), 7.25-7.4 (m, 3H) (ArH), 7.65 (m, 1H) (ArH), 8.85 (s, 1H) (ArH); m/z (M+H)+. 305, HPLC purity 100%, HPLC retention time 3.66 min.

1. customprepared in a manner similar to
2. customirradiated to 120° C. for 45 min
3. customThe mixture was evaporated in vacuo to dryness
4. customthe residual oil was purified by flash column chromatography over silica using
5. additiona 3:7 mixture of hexane and dichloromethane as eluant
6. customthe solvents removed in vacuo