Sodium Hydroxide → (2S,4R)-1-{2-[4-(4-chloro-phenyl)-piperazin-1-yl]-5-oxo-6,7-dihydro-5H-5lambda4-thieno[3,2-d]pyrimidin-4-yl}-4-hydroxy-pyrrolidine-2-carboxylic acid

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Reaction Steps

1.12 g methyl (2S,4R)-1-{2-[4-(4-chloro-phenyl)-piperazin-1-yl]-5-oxo-6,7-dihydro-5H-5λ4-thieno[3,2-d]pyrimidin-4-yl}-4-hydroxy-pyrrolidine-2-carboxylate as a mixture of diastereomers (cf Example 125) and 11.38 ml of 1 molar sodium hydroxide solution are placed in 10 ml of methanol, then refluxed for 4 hours with stirring. The resulting suspension is evaporated down, the residue is cooled and acidified with 2 molar hydrochloric acid and the suspension is evaporated down again. The product is purified by preparative HPLC (method A). 1.12 g of the product are obtained as a powder.

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