4-Nitrobenzoic Acid → HCID 178525740, compound

Participants

Reaction Conditions

Reaction Steps

Dissolve 1-(trans-4-hydroxy-cyclohexyl)-pyrrolidin-2-one (preparation 1) (144 g; 0.79 mol) in dry tetrahydrofuran (5 L) and cool to −5° C. under nitrogen. Add triphenylphosphine (310 g; 1.185 mol) and 4-nitrobenzoic acid (198 g; 1.185 mol). Add diisopropyl azodicarboxylate (230 mL; 1.185 mol) drop-wise and stir at room temperature overnight. Add saturated aqueous sodium hydrogencarbonate (1 L) extract into dichloromethane (2×2.5 L) in a 20 L separating funnel. Dry the combined organic layers over magnesium sulfate, filter and concentrate. Purify over silica gel (iso-hexane/ethyl acetate 50-100% then 10% methanol in ethyl acetate) to afford 163 g (62%) of the title compound.

Provenance & Evidence