As illustrated in the core morphinan structure, there may be four chiral carbons, i.
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The terms "halogen" or "halo" as used herein alone or as part of another group refer to chlorine, bromine, fluorine, and iodine.
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Surprisingly, addition of all of the proton acceptor at the start of the reaction or before the reaction becomes heterogeneous results in lower yields, less stereoselective conversion, and increased impurities.
In another embodiment, the epimeric ratio of 6-beta-hydroxy to 6-alpha-hydroxy may be at least about
The process of claim 5, wherein the ligand is chosen from:
Koolpe et al.
As used herein, the term "stall" refers to a reaction in which the conversion stops completely or slows to such a slow rate that it is essentially stopped.