Sodium Carbonate → 2'-Methyl-4'-(2-oxopyrrolidin-1-yl)[1,1'-biphenyl]-4-carboxylic acid

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Reaction Steps

A stirred mixture of 1-(4-bromo-3-methylphenyl)pyrrolidin-2-one (D46, 50 g, 0.20 mole) and 4-boronobenzoic acid (32 g, 0.20 mole) in 1,2-dimethoxyethane (500 ml) was treated with a solution of Na2CO3 (94 g, 0.88 mole) in water (500 ml), then de-gassed by bubbling argon through for 0.25 hrs. Tetrakis (triphenylphosphine)palladium (O) (5 g) was added and the mixture heated under reflux for 22 hours, then allowed to cool and concentrated in vacuo to approx. 50% volume. The aqueous residue was diluted with water to approx. 1000 ml, washed with ethyl acetate, then acidified with conc. HCl acid. The precipitate was filtered off, washed with water, dried and recrystallised from ethanol to afford the title compound as a cream solid (30.3 g, 52%).

Provenance & Evidence