Construction of alkyl-substituted 7-norbornenones through Diels−Alder cycloaddition of electron-deficient olefins and a cyclopentadienone derivative generated in situ
aSchool of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
bState Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200032, China
cState Key Laboratory of Innovative Natural Medicine and Traditional Chinese Medicine Injections, Jiangxi Qingfeng Pharmaceutical Co. Ltd., Ganzhou 341000, China
dDepartment of Phytochemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
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