Transition Metal-Free-Catalyzed Regioselective Reversal in the Cyclization of 2-Diazo-3,5-dioxo-6-ynoates/ynones/ynamide: Synthesis of Diazo γ-Pyrones and Diazo 3(2 H)-Furanones
Lu Shengle, Tu Xianxia, Liu Weishun, Shen Liting, Mao Shanjian, Deng Guisheng
Chin. J. Org. Chem. . 2018, (7): 1663 -1672 .  DOI: 10.6023/cjoc201712014