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- W2041556565 endingPage "8788" @default.
- W2041556565 startingPage "8766" @default.
- W2041556565 abstract "Evolution of the synthetic strategy that culminated in the first total syntheses of the structurally unique plectosphaeroic acids B (2) and C (3) is described. The successful enantioselective route to (+)-2 and (+)-3 proceeds in 6 and 11 steps from the known hexahydro-2H-pyrazinopyrrolo[2,3-b]indole-1,4-dione 39, which in turn is available in enantiomerically pure form by chemical synthesis. The central challenge in this synthesis endeavor was uniting the hexahydro-2H-pyrazinopyrrolo[2,3-b]indole-1,4-dione and cinnabarinic acid fragments of these marine alkaloids. Critical for achieving this successful C-N bond formation was the use of an iodocinnabarinic acid diester in which the amino group was masked with two Boc substituents, a Cu(I) carboxylate complex and the weak base KOAc. The highly congested C-N bond generated in this coupling, in conjunction with the delicate nature of the densely functionalized coupling partners, provided a striking testament to the power of modern copper-mediated amination methods. Two approaches, one stereoselective, for introducing the methylthio substituents of (+)-plectosphaeroic acid B were developed. The epitrisulfide ring of (+)-plectosphaeroic acid C was formed by ring expansion of an epidisulfide precursor." @default.
- W2041556565 created "2016-06-24" @default.
- W2041556565 creator A5034210490 @default.
- W2041556565 creator A5055838001 @default.
- W2041556565 date "2013-08-27" @default.
- W2041556565 modified "2023-10-18" @default.
- W2041556565 title "Enantioselective Total Syntheses of Plectosphaeroic Acids B and C" @default.
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- W2041556565 doi "https://doi.org/10.1021/jo4015479" @default.