A Ring-Closing Enyne Metathesis Approach to Functionalized Semicyclic Dienes: The Total Synthesis of (-)-Tetrangomycin
作者:Lindon W. K. Moodie、David S. Larsen
DOI:10.1002/ejoc.201301627
日期:2014.3
The angucycline antibiotic (–)-tetrangomycin was synthesized in 13 steps (11 % overall yield) by using a stereoselective Diels–Alder reaction between a naphthoquinone and a semicyclicdiene to construct the benz[a]anthraquinone ring system. The diene intermediates were synthesized through a ring-closingenynemetathesis reaction. The tertiary alcohol at C-3 was installed by an asymmetric dihydroxylation
Tandem intramolecular benzyne–furan cycloadditions. Total synthesis of vineomycinone B2 methyl ester
作者:Steven M. Sparks、Chi-Li Chen、Stephen F. Martin
DOI:10.1016/j.tet.2007.04.031
日期:2007.8
We have exploited tandemintramolecular benzyne-furan cycloadditions employing three different benzyne precursors to generate substituted bisoxabenzonorbornadienes in a single operation. The regiochemical outcomes in these Diels-Alder reactions were effectively controlled by using disposable silicon tethers to link the reacting benzynes and furan moieties. Two different methods for converting the intermediate
-1alpha-Amino-1,6,9-trideoxy forskolin was synthesized starting from drimenal and an isoprenoid C-5 unit. A tricyclic labdane with the entire forskolin skeleton was available in only four steps. Barton's nitrite photolysis was applied to functionalize C-1. (C) 2003 Elsevier Science Ltd. All rights reserved.