Cyclization, radicals with benzynes

Aryne cycloadditions have been coupled with radical cyclizations to rapidly assemble multiring systems For example, benzyne addition to furan 278 followed by radical cyclization onto the newly formed double bond gave 280 in two steps and fair yield. 

Finally, 1,3-cycloadditions have been coupled with radical cyclizations to quickly assemble polycyclic systems, as in the conversion of betaine 415 to benzyne cycloadduct 416 and thence to aminoketone 417. ... 

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