1) The first synthesis of spirocyclopentyl derivatives of lupane triterpenoids by radical nitrocyclization of C-2-diallyl substituted betulonates
Anna Yu. Spivak, Elvira R. Shakurova, Darya A. Nedopekina, Sergey L. Khursan, Michail Yu. Ovchinnikov, Leonard M. Khalilov, Victor N. Odinokov
Tetrahedron Letters
Volume 53, Issue 2, 11 January 2012, Pages 217–221
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http://dx.doi.org/10.1016/j.tetlet.2011.11.020