Sodium Carbonate → 3-(Isoquinolin-4-yl)-8-methyl-8-azabicyclo[3.2.1]oct-2-ene

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Reaction Steps

A mixture of isoquinolin-4-ylboronic acid, 3-trifluoromethanesulfonyloxy-8-methyl-8-azabicyclo [3.2.1]-oct-2-ene, lithium chloride, [1,1'-bis(diphenylphos-phino)-1-ferrocene]-palladium II chloride, and 2M aqueous sodium carbonate in tetrahydrofuran containing a few drops of methanol is stirred at reflux for about 4 hours. The reaction is cooled to room temperature and then partitioned between ethyl acetate and 2N sodium hydroxide. The phases are separated and the aqueous phase extracted well with ethyl acetate. The organic phases are combined, washed with saturated aqueous sodium chloride, dried over sodium sulfate and concentrated under reduced pressure. The residue is subjected to flash silica gel chromatography. Fractions containing product are combined and concentrated under reduced pressure to provide 3-(isoquinolin-4-yl)-8-methyl-8-azabicyclo[3.2.1]oct-2-ene.

Provenance & Evidence