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Abstract
(−)-Galanthamine has been synthesised using an efficient nine-step procedure, which in large scale affords 12.4 (6.7−19.1)% overall yield. The process improvements and optimization of each step are described. Notable steps include (i) an oxidative phenol coupling and (ii) crystallisation-induced chiral conversion of (±)-narwedine to (−)-narwedine. This is a practical and cost-effective synthesis of (−)-galanthamine which is amenable to pilot plant scale-up to afford sufficient material for use in clinical trials.
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