反应详情

温度

80 °C

4,6-Dichloro pyrazolo[3,4-d]pyrimidine intermediate 27 and an aryl boronic acid or pinacol ester (1 eq) are suspended in acetonitrile, and sodium carbonate (3 eq, 80 mg) in solution with water. Bis(triphenylphosphine)palladium(II) chloride (0.05 eq) is added. The reaction mixture is heated in microwave at about 80° C. for about 5 min. Water is added to the mixture, and the precipitated product is filtered and purified by column chromatography to yield the 4-aryl, 6-chloro pyrazolo[3,4-d]pyrimidine product 31. Substituents R1′ and R2′ may be R1 and R2 as defined, or protected forms or precursors thereof.

1. filtrationthe precipitated product is filtered
2. custompurified by column chromatography