Если не затруднит - помогите со статьёй:
Ana M.G. Silva, Augusto C. Tomé, Maria G.P.M.S. Neves, José A.S. Cavaleiro, C. Oliver Kappe
Tetrahedron Letters 2005 Vol. 46, Iss.28, P. 4723-4726
Porphyrins in Diels–Alder reactions. Improvements on the synthesis of barrelene-fused chlorins using microwave irradiation
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http://dx.doi.org/10.1016/j.tetlet.2005.05.047
