Organocatalyzed enantioselective synthesis of 6-amino-5-cyanodihydropyrano[2,3-c]pyrazoles
Sanjib Gogoia and Cong-Gui Zhao
Tetrahedron Letters
Volume 50, Issue 19, P 2252-2255
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http://dx.doi.org/10.1016/j.tetlet.2009.02.210Ivan G. Binev*, Yuri I. Binev, Bistra A. Stamboliyska and Ivan N. Juchnovski
Journal of Molecular Structure
Volume 435, Issue 3, Pages 235-245
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http://dx.doi.org/10.1016/S0022-2860(97)00193-2