An application of borane as a protecting group for pyridine.

[摘要]：Efforts to couple compd. I with 2-(3-bromopropylamino)pyridine employing base mediation are problematic due to the formation of 3,4-dihydro-2H-pyrido[1,2-a]pyrimidine. To circumvent this issue, 2-(3-bromopropylamino)pyridine was converted to the pyridine borane complex. Finally compd. II was obtained via coupling of the borane complex with I, followed by removal of the borane under acidic conditions and sapon. of the ester.

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