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2005
Alkaloids
U 0600
22- 201
Protoberberines 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., Ludwig-Maximilians-Univ., D-81377 Muenchen,
Germany; Eng.) — D. Singer
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