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6Varinder K. Aggarwal, Richard S. Grainger, Gary K. Newton, Peter L. Spargo, Adrian D. Hobson and Harry Adams.
Highly diastereoselective 1,3-dipolar cycloaddition reactions of trans-2-methylene-1,3-dithiolane 1,3-dioxide with 3-oxidopyridinium and 3-oxidopyrylium betaines: a route to the tropane skeleton, Org. Biomol. Chem., 2003, 1, 1884. Heterocycles via Pyrylium and Pyridinium Betaines, Synthesis of Heterocycles via Cycloadditions II