SCHEDULED MAINTENANCE
An efficient enantioselective synthesis of (–)-ring-B imide (19) from R-malic acid is outlined and this product is used for synthesis, by a photochemical route, of the 2,7,20-trimethylisobacteriochlorin (3), of importance for biosynthetic research on vitamin B12.
W. G. Whittingham, M. K. Ellis, P. Guerry, G. B. Henderson, B. Müller, D. A. Taylor, F. J. Leeper and A. R. Battersby, J. Chem. Soc., Chem. Commun., 1989, 1116 DOI: 10.1039/C39890001116
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