The chiral mono-thiol diester, 1 or 2, is converted to the corresponding enantiomeric cyclised products,(–)-7 and (+)-7 or (–)-9, and (+)-9, depending on whether LDA or AlCl3–Et3N is used.
S. Sano, H. Ushirogochi, K. Morimoto, S. Tamai and Y. Nagao, Chem. Commun., 1996, 1775 DOI: 10.1039/CC9960001775
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