YH Wang, DH Zhang, ZH Cao, WL Li, YY Huang - RSC advances, 2021 - pubs.rsc.org
CsOH· H2O-catalyzed formal [3+ 3] cycloadditions of allenyl imide with β-ketoesters, 1, 3-
diketones or β-ketonitriles for the synthesis of tetrasubstituted 2-pyrone derivatives have …