1,3-Propanediol → HCID 23087153, compound

Participants

Reaction Steps

Synthesized from 4-fluoro-2-nitrophenol (3.0 g) according to an analogous synthetic method to Preparation Example 80 described below, 4-fluoro-2-nitrophenyl trifluoromethanesulfonate (5.5 g) was obtained. To a suspension of (6-methoxynaphthalen-2-yl)boronic acid (2.5 g) in diethyl ether (60 ml) was added 1,3-propanediol (0.9 ml), and the solution was stirred for 2 hours at room temperature. Tetrahydrofuran and anhydrous magnesium sulfate were sequentially added thereto, the solution was stirred, then filtered, and the filtrate was concentrated in vacuo. To a solution of the resulting 2-(6-methoxynaphthalen-2-yl)-[1,3,2]dioxaborinane (3.1 g) and 4-fluoro-2-nitrophenyl trifluoromethanesulfonate (2.8 g) in N,N-dimethylformamide (50 ml) were added tetrakis(triphenylphosphine)palladium(0) (350 mg) and cesium carbonate (6.0 g), and the solution was stirred for 2 hours at 100° C. under a nitrogen atmosphere. Ethyl acetate and tetrahydrofuran were sequentially added thereto, the solution was stirred, then insoluble material was removed by filtration, the solution was extracted with ethyl acetate, then sequentially washed with water and brine, dried over anhydrous magnesium sulfate, then the solvent was evaporated in vacuo, the resulting solid was washed with a hexane-diethyl ether system to provide 2-(4-fluoro-2-nitrophenyl)-6-methoxy-1,2,3,4-tetrahydronaphthalene (2.4 g). The total amount of this compound was used according to an analogous synthetic method to Example 22 to provide the title compound (1.6 g).

Provenance & Evidence