Sodium Hydroxide → trans-2-[4-(6-Trifluoromethyl-benzo[b]thiophen-3-yl)-piperazin-1-ylmethyl]-cyclopropanecarboxylic acid

Participants

Reaction Steps

Add 5N NaOH solution (425 mL, 226 mmol) to a solution of trans-2-[4-(6-trifluoromethyl-benzo[b]thiophen-3-yl)-piperazin-1-ylmethyl]-cyclopropanecarboxylic acid methyl ester, Example 6a, (18.0 g, 45.1 mmol) in dioxane/methanol (400 mL, 3:1) and heat the reaction at 60° C. for 6 h. Selectively remove most of the methanol and acidify the remaining dioxane solution to pH 5–6 with 2N acetic acid. Collect the desired compound, which precipitates from solution, to obtain 14.08 g (81%) of colorless crystals, m/z=385 (M+H)+

Provenance & Evidence