First Total Synthesis of the Bioactive Anthraquinone Kwanzoquinone C and Related Natural Products by a Diels–Alder Approach
作者:Lutz F. Tietze、Kersten M. Gericke、Carlos Güntner
DOI:10.1002/ejoc.200600634
日期:2006.11
cycloaddition.Diels–Alder reaction of 6 with the juglonederivative 5 gives the bis-benzyl-protected anthraquinone 4 after aromatization. Finally, glycosidation of the phenolic hydroxy group using 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl trichloroacetimidate followed by the cleavage of the benzyl ethers and the solvolysis of the acetate groups yields the natural product 1. A related anthraquinone natural
A Diels-Alder Reaction for the Total Synthesis of the Novel Antibiotic Antitumor Agent Mensacarcin
作者:Lutz F. Tietze、Carlos Güntner、Kersten M. Gericke、Ingrid Schuberth、Gabor Bunkoczi
DOI:10.1002/ejoc.200400826
日期:2005.6
The antibiotic mensacarcin (1), which contains nine stereogenic centers and two epoxy functionalities, is a novelantitumor agent that was first isolated from the culture broth of Streptomyces sp. Go C4/4 found in a soil sample next to the northern cafeteria of the University of Gottingen. For the synthesis of 1 and relatedstructurally simplified analogs, aDiels–Alder reaction of O-methyljuglone (11)