"Facile Access to Ring-Fused Aminals via Direct α-Amination of Secondary Amines with o-Aminobenzaldehydes: Synthesis of Vasicine, Deoxyvasicine, Deoxyvasicinone, Mackinazolinone, and Ruteacarpine"
Matthew T. Richers, Indubhusan Deb, Alena Yu. Platonova, Chen Zhang, Daniel Seidel
Synthesis 2013; 45(13): 1730-1748
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http://dx.doi.org/10.1055/s-0033-1338852