Tetrahedron Letters Volume 27, Issue 33, 1986, Pages 3915-3918
Oxazoles as Dienophiles in Diels-Alder Reactions
Alessandro Dondoni, Marco Fogagnolo, Annarosa Mastellari, Paola Pedrini, Franco Ugozzoli
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http://dx.doi.org/10.1016/S0040-4039(00)83916-7