François Crestey, Valérie Collot, Silvia Stiebing, Jean-François Lohier, Jana Sopkova-de Oliveira Santos and Sylvain Rault,"New practical access to 2-azatryptophans and dehydro derivatives via the Wittig–Horner reaction ",Tetrahedron Letters, Vol 48, Iss 14, 2007, стр. 2457-2460.
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dx.doi.org/10.1016/j.tetlet.2007.02.042 
