Protoberberines from Reissert-Compounds. Part IX [1]. An Alternative Approach to Dibenzoquinolizine- and Isoquinonaphthyridin-13a-carboxylic Acids, a Novel Synthesis of Alangimarine
作者:Eberhard Reimann、Fritz Grasberger
DOI:10.1007/s00706-004-0231-5
日期:2005.2
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