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Direct Electrophilic C-H Alkynylation of Unprotected 2-Vinylanilines.
Chemistry : a European Journal 2017 Februrary 25
Unprotected aromatic amines can be used as directing groups in metal-catalyzed C-H alkynylations of alkenes. By using low amounts of an IrIII catalyst in combination with alkynylbenziodoxolones as electrophilic alkyne-transfer reagents, highly desirable 1,3-enynes were isolated in excellent yields of up to 98 % with Z stereoselectivity. A broad substrate scope as well as the high synthetic utility of the 1,3-enynes render this new method an efficient approach for the synthesis of five- and six-membered heterocycles. Further derivatizations of the 1,3-enynes to highly substituted quinolines through AuI - and N-bromosuccinimide-mediated exo-dig cyclizations were demonstrated.
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