Cesium carbonate → 3-chloro-4-(3-(5-fluoro-1,3-dioxo-1H-pyrido[1,2-c]pyrimidin-2(3H)-yl)-2-methylphenyl)-7-(2-hydroxypropan-2-yl)-9H-carbazole-1-carboxamide

Participants

Reaction Steps

A mixture of 4-bromo-3-chloro-7-(2-hydroxypropan-2-yl)-9H-carbazole-1-carboxamide [Intermediate 3] (0.076 g, 0.200 mmol), 5-fluoro-2-(2-methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1H-pyrido[1,2-c]pyrimidine-1,3(2H)-dione [Intermediate 37] (0.072 g, 0.182 mmol) and Cs2CO3 (0.118 g, 0.363 mmol) in THF (3 mL) and water (0.75 mL) was bubbled with nitrogen for 2 min, then was treated with PdCl2(dppf) DCM adduct (7.4 mg, 9.09 μmol). Bubbling with nitrogen was continued for 30 sec and the reaction vessel was sealed. The mixture was stirred at room temperature overnight, then was diluted with EtOAc and washed sequentially with water and brine. The combined aqueous layers were extracted with DCM. The combined organic layers were dried and concentrated. The residue was purified by column chromatography on silica gel, eluting with EtOAc-hexanes, to give 3-chloro-4-(3-(5-fluoro-1,3-dioxo-1H-pyrido[1,2-c]pyrimidin-2(3H)-yl)-2-methylphenyl)-7-(2-hydroxypropan-2-yl)-9H-carbazole-1-carboxamide (mixture of four atropisomers) as a yellow solid (0.049 g, 43% yield). Mass spectrum m/z 571 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ 11.52-11.48 (m, 1H), 8.27 (br. s., 1H), 8.15-8.09 (m, 2H), 7.84 (s, 1H), 7.59 (br. s., 1H), 7.56-7.46 (m, 2H), 7.30-7.26 (m, 1H), 7.03-6.97 (m, 1H), 6.72 (d, J=8.4 Hz, 1H), 6.60-6.51 (m, 2H), 5.85 (s, 1H), 4.98 (s, 1H), 1.71 (s, 3H), 1.46-1.42 (m, 6H).

Provenance & Evidence