Pyrrolidine → 1-(1,4-dioxa-spiro[4.5]dec-7-en-8-yl)-pyrrolidine

Participants

Reaction Steps

Reflux a solution of 1,4-cyclohexanedione mono-ethylene ketal (10.4 g, 66.5 mmol) and pyrrolidine (4.96 g, 69.8 mmol) and p-toluenesulfonic acid monohydrate (0.13 g, 0.66 mmol) in 50 mL cyclohexane overnight with a Dean-Stark trap and drying tube. Filter the mixture, wash with Et2O and concentrate the brown filtrate to afford 4.20 g of 1-(1,4-dioxa-spiro[4.5]dec-7-en-8-yl)-pyrrolidine as brown oil

Provenance & Evidence