p-Toluenesulfonic acid monohydrate → HCID 68957204, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of the product of Step C, 1-[5-hydroxy-3-(4-methoxy-phenyl)-4-phenyl-4,5-dihydro-isoxazol-5-yl]-cyclopropanecarboxylic acid methyl ester, (2354 g) in toluene (8 L) is added p-toluenesulfonic acid monohydrate (40.8 g.) The mixture is stirred at 64° C. for 6.5 hours and is subsequently filtered over Celite filter aid. The Celite cake is washed with toluene (2×1 L) and the filtrate is diluted with a mixture of isopropanol (6 L) and heptane (6 L) to form a precipitate. The precipitate is triturated to afford a solid. The solid is triturated in a mixture of isopropanol (6 L) and heptane (2 L) for 3.5 hours and is subsequently collected by filtration. The solid is dried to afford the synthetic intermediate 1-[3-(4-methoxy-phenyl)-4-phenyl-isoxazol-5-yl]-cyclopropanecarboxylic acid methyl ester (889 g.)

Provenance & Evidence