Feeding experiments with asymmetrically labelled precursors show that in the biological conversion of O-methylnorbelladine (2) into the 5,11-methanomorphanthridine alkaloid, montanine (5), a pro-S hydrogen from C-2 of the precursor is lost.
C. Fuganti, D. Ghiringhelli and P. Grasselli, J. Chem. Soc., Chem. Commun., 1973, 430 DOI: 10.1039/C39730000430
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