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O-tert-Butylacrylanilides with N–H substitution undergo 6π-photocyclization at the unsubstituted ortho carbon, whereas the corresponding N-methyl derivatives cyclize at the ortho carbon bearing the tert-butyl with the eventual loss of 2-methylpropene.

Graphical abstract: 6π-Photocyclization of O-tert-butylacrylanilides. N-substitution dictates the regiochemistry of cyclization

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