Electrophilic cyclization of N-alkenylamides using a Chloramine-T (cas 127-65-1)/I2 system
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Add time:09/27/2019 Source:sciencedirect.com
A new protocol for the cyclization of N-alkenylamides using chloramine-T and iodine is described. When N-alkenylsulfonamides are treated with chloramine-T and iodine, three- to six-membered N-heterocycles are obtained with complete stereoselectivity. The method is compatible with the cyclization of the allylbenzamide or allylbenzthioamide to afford an oxazoline or thiazoline derivative, respectively. Mechanistic studies indicate that the chloramine-T/I2 system functions as an effective iodonium species.
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