Sodium hydride → HCID 72330455, compound

Participants

Reaction Steps

A solution of 2.45 g (10.0 mmol) of 1-tert-butyl 2-methyl 4-[hydroxy]pyrrolidine-1,2-dicarboxylate (24) in DMF (10 ml) was added to a suspension of 0.65 g (15 mmol) of sodium hydride in DMF (20 ml). After 15 min, a solution of 5.56 g (15.0 mmol) of 1,2-ethanediol bistosylate in DMF (10 ml) was added. The batch was subsequently reacted in 3 portions at 100° C. in a microwave for 45 minutes. The batch was concentrated and treated with water and ethyl acetate. After phase separation, the aqueous phase was extracted with ethyl acetate. The combined organic phases were dried over sodium sulfate, filtered and the solvent was removed in vacuo. The crude product was purified by column chromatography (silica gel, hexane/ethyl acetate). 1.2 g (27%) of 1-tert-butyl 2-methyl 4-[2-(toluene-4-sulfonyloxy)ethoxy]pyrrolidine-1,2-dicarboxylate were obtained.

Provenance & Evidence