p-Toluenesulfonic acid → N-(3-(6-chloro-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl)phenyl)acrylamide

Participants

Reaction Steps

As an example, N-(3-(6-((3-fluoro-4-morpholinophenyl)amino)-1H-pyrazolo[3,4-d]pyrimidin-4-yl)phenyl)acrylamide can be prepared according to Route II. Beginning with 4,6-dichloro-1H-pyrazolo[3,4-d]pyrimidine, protection can be accomplished by reaction with 3,4-dihydro-2H-pyran in the presence of p-TsOH in a suitable solvent such as a solution of THF and methylene chloride. The reaction is carried out for a suitable period of time, e.g. about 8-18 hr, at a suitable temperature, e.g. about 15-30° C., until the reaction is complete. The completeness of the reaction can be ascertained by several convenient methods, including monitoring the reaction by TLC. The resulting 4,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-d]pyrimidine can then be coupled with (3-acrylamidophenyl)boronic acid under palladium catalyzed conditions to provide N-(3-(6-chloro-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl)phenyl)acrylamide.

Provenance & Evidence