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First Higher-Order Photocycloaddition to a C N Bond: 1,3-Diazepines from Maleimides

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A light touch is all that is required to cleave a maleimide CN bond to effect a [5+2] photocycloaddition with a sterically encumbered CN moiety (see scheme).

http://onlinelibrary.wiley.com/doi/10.1002/anie.200805846/full
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