Sergey V. Ryabukhin, Andrey S. Plaskon, Semen S. Bondarenko, Eugeniy N. Ostapchuk, Oleksandr O. Grygorenko, Oleg V. Shishkin, Andrey A. Tolmachev Acyl pyruvates as synthons in the Biginelli reaction. Tetrahedron Letters, Volume 51, Issue 32, Pages 4229-4232.
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http://dx.doi.org/10.1016/j.tetlet.2010.06.032