Journal
ORGANIC LETTERS
Volume 10, Issue 14, Pages 3089-3092Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol801092s
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Treatment of N-arylisonicotinamides with trifluoromethanesulfonic anhydride triggers intramolecular nucleophilic attack of the aryl ring on the 4-position of the pyridinium intermediate. The products are spirocyclic dihydropyridines which can be converted to valuable spirocyclic piperidines related to biologically active molecules such as MK-677.
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