Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 87, Issue 4, Pages 1986-1995Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.1c00905
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This article describes the asymmetric syntheses of foslevodopa and foscarbidopa and their manufacturing process at pilot scale. The synthesis of foslevodopa involves Horner-Wadsworth-Emmons olefination reaction and enantioselective hydrogenation, while the synthesis of foscarbidopa utilizes Mizoroki-Heck reaction and enantioselective hydrazination.
Foslevodopa (FLD, levodopa 4'-monophosphate, 3) and foscarbidopa (FCD, carbidopa 4'-monophosphate, 4) were identified as water-soluble prodrugs of levodopa (LD, 1) and carbidopa (CD, 2), respectively, which are useful for the treatment of Parkinson's disease. Herein, we describe asymmetric syntheses of FLD (3) and FCD (4) drug substances and their manufacture at pilot scale. The synthesis of FLD (3) employs a Horner-Wadsworth-Emmons olefination reaction followed by enantioselective hydrogenation of the double bond as key steps to introduce the a-amino acid moiety with the desired stereochemistry. The synthesis of FCD (4) features a Mizoroki-Heck reaction followed by enantioselective hydrazination to install the quaternary chiral center bearing a hydrazine moiety.
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