p-Toluenesulfonic acid monohydrate → (3S)-3-Fluoropyrrolidine 4-methylbenzenesulfonate

Participants

Reaction Steps

Add p-toluenesulfonic acid monohydrate (0.50 g, 2.64 mmol) to tert-butyl (3S)-3-fluoropyrrolidine-1-carboxylate (See Intermediate 48) (0.50 g, 2.64 mmol) in ethanol (5 mL) at room temperature. Stir the resulting solution overnight. Concentrate the reaction mixture in vacuo to remove solvent and bi-products to give the title compound as an off-white solid (0.65 g): MS (m/e): 90 (M+1).

Provenance & Evidence