Protoberberines from Reissert-Compounds. Part IX [1]. An Alternative Approach to Dibenzoquinolizine- and Isoquinonaphthyridin-13a-carboxylic Acids, a Novel Synthesis of Alangimarine |
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Authors: | Eberhard Reimann and Fritz Grasberger |
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Institution: | (1) Graduate School of Pharmaceutical Science, Kyoto University, Yoshidashimoadachicho 26–29, Kyoto 606-8501, Japan |
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Abstract: | 3,4-Dihydroisoquinoline-Reissert-compounds were alkylated to 1-benzyl- and 1-picolyl-derivatives, which in turn could selectively be hydrolized yielding various carboxylic acids, among others certain amino acids related to 3 ,4 -deoxynorlaudanosoline carboxylic acid (DNLCA). These on treating with ethanolic KOH underwent cyclization to dibenzoquinolizine- and isoquinonaphthyridine-13a-carboxylic acids. Alternatively this cyclization also could be achieved by a more convenient one-pot procedure starting from the same dihydro-Reissert-compounds. Thermal decarboxylation afforded among others the alangia alkaloids alangimarine and dihydroalangimarine. |
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