Lithium hydroxide, monohydrate → 3-Methylsulfonyl-5-(2-oxopyrrolidin-1-yl)benzoic acid

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Reaction Steps

Methyl 3-methylsulfonyl-5-(2-oxopyrrolidin-1-yl)-benzoate (D18) (0.717 g) was suspended in dioxan (3.6 ml) and treated with a solution of lithium hydroxide monohydrate (0.153 g) in water (3.6 ml). The mixture was stirred for 2 h at room temperature and a clear solution was formed. The pH was adjusted to ˜4 by addition of Amberlyst-15 H+ resin. The resin was removed by filtration and washed well with dioxan. The combined filtrates were evaporated and the residue dried. Trituration with ether gave D19 (0.51 g) as a pale cream solid.

Provenance & Evidence