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
3,4-二氢异喹啉 Reissert -化合物进行烷基化,1-苄基-和1-吡啶甲基-衍生物,这反过来又可以被选择性地水解,得到各种羧酸,等等相关的3',4'- deoxynorlaudanosoline羧酸某些氨基酸酸( DNLCA )。这些用乙醇KOH处理的化合物进行环化成二苯并喹oli嗪-和异喹啉吡啶-13a-羧酸。可替代地,该环化也可以通过从相同的二氢 -Reissert- 化合物开始的更方便的一锅法来实现 。热脱羧除其他以外,提供了兰吉兰生物碱,兰吉明碱和二氢芳基海洋碱。