Palladium-catalyzed stereoselective decarboxylative [4 + 2] cyclization of 2-methylidenetrimethylene carbonates with pyrrolidone-derived enones: Straightforward access to chiral tetrahydropyran-fused spiro-pyrrolidine-2,3-diones
a Key Laboratory of Natural Medicines of the Changbai Mountain, Ministry of Education, College of Pharmacy, Yanbian University, Yanji 133002, China
b College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
c Engineering Center of Catalysis and Synthesis for Chiral Molecules, Fudan University, Shanghai 200433, China
d Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
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