Triphenylphosphine → Ethyl 3-[2-(2-fluorophenyl)-vinyl]-4-methoxybenzoate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

N,N-Dimethylformamide (5 mL) was added to 1.0 g of polymer-supported triphenylphosphine (produced by Fluka, CAS registry number 39319-11-4) and 1.1 g of 2-fluorobenzyl bromide, and the mixture was stirred for 10 hours at 80° C. The reaction mixture was filtered, and then washed with N,N-dimethylformamide, dichloromethane, and methanol. The residue was dried under reduced pressure to prepare polymer-supported (2-fluorobenzyl)-triphenylphosphonium bromide. This product (144 mg) was added to a methanol solution (2 mL) of 30 mg of ethyl 3-formyl-4-methoxybenzoate obtained in step C of Example 1-2-1. After 80 μL of 28% sodium methoxide was added, the reactor was sealed, and the mixture was stirred for 4 hours at 70° C. The residue was diluted with ethyl acetate, washed with purified water, and dried over anhydrous sodium sulfate. The anhydrous sodium sulfate was separated by filtration, and then the filtrate was concentrated under reduced pressure. The residue was dried under reduced pressure to obtain 33 mg (80%) of ethyl 3-[2-(2-fluorophenyl)-vinyl]-4-methoxybenzoate.

Herkunft & Nachweise