Cesium carbonate → 3-chloro-8-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl methoxy)-9-(3-hydroxy-3-methyl-but-1-ynyl)-6,6-dimethyl-5,6-dihydro-benzo[b]carbazol-11-one

Participants

Reaction Conditions

Reaction Steps

To the mixture of 9-bromo-3-chloro-8-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl methoxy)-6,6-dimethyl-5,6-dihydro-benzo[b]carbazol-11-one (Compound S7-1, 50 mg, 0.1 mmol), bis(acetonitrile) palladium (II) dichloride (2.6 mg, 0.01 eq.), cesium carbonate (195 mg, 6 eq.) and 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl (14.3 mg, 0.03 eq.), acetonitrile (2 mL) was added and stirred at 80° C. for 12 hr. Tar-like residues obtained after concentration under reduced pressure were purified by silica gel column chromatography (ethyl acetate/hexane) to obtain 3-chloro-8-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl methoxy)-9-(3-hydroxy-3-methyl-but-1-ynyl)-6,6-dimethyl-5,6-dihydro-benzo[b]carbazol-11-one (brown powder, 105 mg).

Provenance & Evidence