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- URN zum Zitieren dieses Dokuments:
- urn:nbn:de:bvb:355-epub-157246
- DOI zum Zitieren dieses Dokuments:
- 10.5283/epub.15724
Zusammenfassung
The Preininger-alkaloid, dehydro-normacrostomine (2b, Scheme 1) was synthesized starting from rac. α-acetyl-3,4-dimethoxybenzylcyanide (3) (Scheme 2). The key intermediate 4-acetyl-6,7-dimethoxy-l-(3,4-methylenedioxybenzyl) isoquinoline (11) is converted via a Mannich base to the nitrile 17 (Scheme 7) which in turn is cyclized to the Preininger-alkaloid (2b) by careful hydrogenation. - Reduction ...
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