Alkaloids U 0600Protoberberines from Reissert-Compounds. Part 9. An Alternative Approach to Dibenzoquinolizine-and Isoquinonaphthyridin-13a-carboxylic Acids, a Novel Synthesis of Alangimarine. -A novel and convenient route to partially hydrogenated 8-oxobenzochinolizine-13a-carboxylic acids and corresponding 10-aza-analogues starting from 1-substituted dihydroisoquinoline-Reissert-compounds [cf. (VI)] is presented. The methodology provides access to the alangia alkaloids (X). -(REIMANN*, E.; GRASBERGER, F.; Monatsh. Chem. 136 (2005) 2, 193-209; Inst. Pharm., Zent. Pharmaforsch.,
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