Dichloromethane → 8-(Tert-butyldimethylsilyloxy)-5-(quinolin-3-yl)-6,7,8,9-tetrahydropyrimido[5,4-b]indolizin-4-amine

Participants

Reaction Steps

A solution of 0.5 M 9-borabicyclo[3.3.1]nonane in THF (50 ml) was added to a solution of 6-bromo-7-(2-(tert-butyldimethylsilyloxy)-3-butenyl)-5-(quinolin-3-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine (2.26 g) obtained in Step 6 in THF (30 ml) under ice-cooling. The mixture was stirred at room temperature for 4 hours. After slowly adding a 3 N aqueous sodium hydroxide solution (19.5 ml) to the reaction mixture at room temperature, a [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium (II) complex with dichloromethane (676 mg) was added to the reaction mixture. The mixture was stirred under a nitrogen atmosphere at 70° C. for 4 hours. After cooling, the reaction mixture was poured into water, followed by extraction with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. The resulting residue was purified by silica gel column chromatography (developing solvent: hexane/ethyl acetate) to obtain the title compound as a yellow, oily substance (778 mg).

Provenance & Evidence