Diastereoselective Synthesis of Dimethyl (4R*,4a′R*,7a′R*)-1-Aryl-6′-benzoyl-4a′-methyl-5-oxo-1,4′,4a′,5,5′,6′-hexahydrospiro[pyrazole-4,7′-pyrrolo[3,4-c]pyridazine]-3′,7a′(1′Η)-dicarboxylates - Uršič, Uroš; Grošelj, Uroš; Meden, Anton; Svete, Jurij; Stanovnik, Branko (Synthesis, 2009)