Asymmetric ring transformation of meso-7-(2-oxoalkyl)bicyclo[3.3.0]octan-3-ones into chiral bicyclo[3.2.1]oct-2-ene derivatives is accomplished by treatment with chiral cyclic (six- or seven-membered ring) 1,2-diols–BF3–Et2O.
T. Yamamoto, H. Suemune and K. Sakai, J. Chem. Soc., Chem. Commun., 1992, 1482 DOI: 10.1039/C39920001482
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