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- W1995620267 abstract "Abstract The two-step process of hydrogenation of l-alkyl-3-acylpyridinium salts and cyclization of the resultant 1, 4, 5, 6-tetrahydropyridines has been the foundation of a general scheme of alkaloid synthesis.1 Its application in the indole alkaloid field has yielded ready access to tetrahydro-β-carboline systems, e.g. 1a → 2 → eburnamonine.2 Since acid treatment of Nb -acyl derivatives of substances related to la has been shown to lead to products of indole β-cyclization3, it became of interest to test the cyclization behavior of the vinylogous imide lb, prepared by the dicyclohexylcarbodiimide-induced acylation of 3-acetyl-1, 4, 5, 6-tetrahydropyridine4 with indoleacetic acid. Treatment of lb with boron trifluoride gave a 62 yield of ketolactam 3a. Thus a two-step entry into the pentacyclic Aspidosperma alkaloid skeleton is on hand." @default.
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- W1995620267 date "1972-01-01" @default.
- W1995620267 modified "2023-09-26" @default.
- W1995620267 title "20-ISO-20-Deethylaspidospermidine" @default.
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- W1995620267 doi "https://doi.org/10.1080/00397917208061982" @default.
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