A new, mild route for the assembly of 3-iodo-1-azaspiro[4.5]deca-6,9-diene-2,8-diones via an electrophilic ipso-cyclization strategy is presented. In the presence of iodine monochloride, water, and sodium bicarbonate, a variety of N-arylacrylamides underwent the intramolecular electrophilic ipso-cyclization reaction to afford the corresponding 3-iodo-1-azaspiro[4.5]deca-6,9-diene-2,8-diones in moderate to good yield.
Key words
ipso-iodocyclization - alkenes - 3-iodo-1-azaspiro[4.5]deca-6,9-diene-2,8-diones - iodine monochloride - hydrolysis