Regioselective Reactions of Ethyl (4,5-Dihydrofuran-3-yl)-2-oxoacetate and Ethyl 2-(3,4-Dihydro-2H-pyran-6-yl)-2-oxoacetate with 1-Unsubstituted Aminoazoles - Stepaniuk, Oleksandr O.; Matvienko, Vitalii O.; Kondratov, Ivan S.; Shishkin, Oleg V.; Volochnyuk, Dmitriy M.; Mykhailiuk, Pavel K.; Tolmachev, Andrei A. (Synthesis, 2012)