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Asymmetric Synthesis of Novel Fused Polycyclic 3,4-Dihydro-pyrano[4,3- b]pyran-5(2 H)-ones via an Organocatalyzed Formal[3+3] Annulation
Xiao Yuanyuan, Wang Youming, Zhou Zhenghong
Chin. J. Org. Chem. . 2019, (8): 2203 -2210 .  DOI: 10.6023/cjoc201703070