Total Synthesis of Oxyfagaronine, Phenolic Benzo[c]phenanthridine and General Synthetic Way of 2,3,7,8- and 2,3,8,9-Tetrasubstituted Benzo[c]phenanthridine Alkaloids
作者:Thanh Nguyen Le、Won-Jea Cho
DOI:10.1248/cpb.54.476
日期:——
Benzo[c]phenanthridine alkaloids such as oxynitidine, oxysanguinarine, oxyavicine and phenolic oxyfagaronine were synthesized from easily available starting benzonitriles 5 and toluamides 6 using a lithiated toluamide-benzonitrile cycloaddition reaction. The coupling reaction provided 3-arylisoquinolinones that were transformed to the benzo[c]phenanthridones. This method is highly efficient and could
Total synthesis of 8-oxypseudopalmatine and 8-oxypseudoberberine via ring-closing metathesis
作者:Hue Thi My Van、Su Hui Yang、Daulat Bikram Khadka、Yong-Chul Kim、Won-Jea Cho
DOI:10.1016/j.tet.2009.10.027
日期:2009.12
Concise synthesis of 8-oxypseudopalmatine and 8-oxypseudoberberine has been achieved using ruthenium-catalyzed ring-closing metathesis (RCM) as the key step, in which the RCM substrates, 3-arylisoquinolinones, were prepared by lithiated cycloaddition reaction with o-toluamides and benzonitriles. (C) 2009 Elsevier Ltd. All rights reserved.