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- W2953354149 abstract "The lymphostins are a family of closely related pyrrolo[4,3,2-de]quinoline natural products produced by Streptomyces and Salinispora actinobacteria. Neolymphostin A was recently shown to strongly inhibit phosphoinositide 3-kinase (PI3K) and the mammalian target of rapamycin (mTOR) in a covalent manner via conjugation to a catalytic lysine residue in the ATP-binding pocket of the enzymes, making this metabolite the first reported covalent kinase inhibitor from a bacterium. A flexible and efficient synthetic route toward these alkaloids would allow for improvements in their solubility, stability, and selectivity and help to deliver a viable drug candidate. We have since established a short synthesis to methyl 8-bromo-1,3,4,5-tetrahydropyrrolo[4,3,2-de]quinoline-4-carboxylate via a conjugate addition/intramolecular Ullman reaction sequence. However, attempts to oxidize this intermediate to the pyrrolo[4,3,2-de]quinoline characteristic of the lymphostins resulted in formation of either a 2-oxo-1,2-dihydropyrrolo[4,3,2-de]quinoline or an unusual N,C-linked tetrahydropyrroloquinoline-pyrroloquinoline heterodimer. We expect that key modifications to the tetrahydropyrroloquinoline intermediate prior to oxidation should prevent these side reactions and pave the way for the completion of the synthesis." @default.
- W2953354149 created "2019-06-27" @default.
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- W2953354149 date "2019-06-19" @default.
- W2953354149 modified "2023-10-01" @default.
- W2953354149 title "Progress toward the Total Synthesis of Lymphostins: Preparation of a Functionalized Tetrahydropyrrolo[4,3,2-<i>de</i>]quinoline and Unusual Oxidative Dimerization" @default.
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- W2953354149 doi "https://doi.org/10.1021/acs.joc.9b01041" @default.
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