SCHEDULED MAINTENANCE
In the title reaction, hard Lewis acids promote the formation of the endo-ester diastereoisomer with up to 96% selectivity whereas soft Lewis acids give the endo-thionoester with up to 89% selectivity. BF3·OEt2 behaves as if it were in the latter category, giving 94%endo-thionoester.
D. C. Braddock, J. M. Brown and P. J. Guiry, J. Chem. Soc., Chem. Commun., 1993, 1244 DOI: 10.1039/C39930001244
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