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C. Oliver Kappe, Georg Uray, Peter Roschger, Wolfgang Lindner, Christoph Kratky and Walter Keller. Synthesis and reactions of biginelli compounds −5. Facile preparation and resolution of a stable 5-dihydropyrimidinecarboxylic acid. Tetrahedron. Volume 48, Issue 26, 1992, Pages 5473-5480.

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dx.doi.org/10.1016/S0040-4020(01)88301-0 

Hidetsura Cho, Yumi Takeuchi, Masaru Ueda and Akira Mizuno. Regioselective synthesis of Image -substituted dihydropyrimidin-2(1H) or (3H )-one. Tetrahedron Letters. Volume 29, Issue 42, 1988, Pages 5405-5408

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dx.doi.org/10.1016/S0040-4039(00)82880-4

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