Acid-mediated [3+3] cycloaddition of α-EWG-α-formyl ketene-S,S-acetals and α-carbamoyl ketene-S,S-acetals: a new approach to 2-pyridone derivatives
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Jian-ping Fu | Xiao-Dan Han | Renren Zhu | Xiong-Hui Li | Huibin Wang | Zhao-Yang Deng | Wei Xiong | Ju-Wu Hu | Guoqing Xu