1. J. Org. Chem., 2009, 74 (14), pp 5090–5092
Direct Synthesis of Polyfunctionalized Unsaturated δ-Lactones and δ-Lactams from α-Alkenoyl α-Carboxyl/Carbamoyl Ketene S,S-Acetals under Vilsmeier Conditions
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http://dx.doi.org/10.1039/P19930002229