Mahmoud M. Abd Rabo Moustafa and Brian L. Pagenkopf
Synthesis of 5-Azaindoles via a Cycloaddition Reaction between Nitriles and Donor−Acceptor Cyclopropanes
Organic Letters 2010, 12 (14), pp 3168–3171
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http://dx.doi.org/10.1021/ol101078z