4-Tributylstannyl-3,6-dihydro-2H-pyran → 8-(4-(3,6-dihydro-2H-pyran-4-yl)-6-(4-nitrophenyl)-1,3,5-triazin-2-yl)-3-oxa-8-azabicyclo[3.2.1]octane

Participants

Reaction Conditions

Reaction Steps

A microwave vial was charged with 8-(4-chloro-6-(4-nitrophenyl)-1,3,5-triazin-2-yl)-3-oxa-8-azabicyclo[3.2.1]octane (0.440 g, 1.27 mmoles). Toluene (6 mL) was then added and the solution was sparged with nitrogen for 10 minutes. Tetrakis(triphenylphosphine)palladium(0) (0.088 g, 0.076 mmol) and tributyl(3,6-dihydro-2H-pyran-4-yl)stannane (0.567 g, 1.52 mmol) were added. The vial was sealed and heated to 100° C. for 40 minutes via microwave. Additional tributyl(3,6-dihydro-2H-pyran-4-yl)stannane (0.283 g, 0.76 mmoles) and tetrakis(triphenylphosphine)palladium(0) (0.022 g, 0.019 mmol) were added and the suspension was heated to 110° C. by microwave for additional 90 minutes. The suspension was then cooled to room temperature and filtered through Celite™. The filter cake was washed with ethyl acetate and the filtrate was concentrated under reduced pressure. The crude product was purified by silica gel chromatography, eluting with 0-2% methanol in methylene chloride, to provide 8-(4-(3,6-dihydro-2H-pyran-4-yl)-6-(4-nitrophenyl)-1,3,5-triazin-2-yl)-3-oxa-8-azabicyclo[3.2.1]octane (0.430 g, 86%) as a light yellow solid. HRMS 396.1666 (M+H, calc.), 396.1668 (M+H, obs.).

Provenance & Evidence