[structure: see text] The first totalsynthesis of gambierol, a marinepolycyclicether toxin, has been achieved. The synthesis features the Pd(PPh3)4/CuCl/LiCl-promoted Stille coupling for the stereoselective construction of the sensitive triene side chain that includes a conjugated (Z,Z)-diene moiety.
Lewis Acid-Catalyzed Hydrometalation and Carbometalation of Unactivated Alkynes
作者:Naoki Asao、Yoshinori Yamamoto
DOI:10.1246/bcsj.73.1071
日期:2000.5
carbostannation of unactivatedalkynes with organosilanes, or organostannanes proceed effectively in the presence of catalytic amounts of Lewis acids to produce the corresponding vinylsilyl or vinylstannyl compounds in a highly regio- and stereoselective way. Although it is well known that transition metal catalyzed hydrometalations and carbometalations, in general, proceed in a cis-manner, the Lewis acid-catalyzed
作者:Henry W. B. Johnson、Utpal Majumder、Jon D. Rainier
DOI:10.1021/ja043396d
日期:2005.1.1
This communication describes the totalsynthesis of the marine polyether toxin, gambierol. This work couples our iterative C-glycoside/enol ether-olefin metathesis strategy to the subunits with a unique olefin metathesis/carbonyl olefination reaction to bring the subunits together.
Total Synthesis of Gambierol: Subunit Coupling and Completion
作者:Henry W. B. Johnson、Utpal Majumder、Jon D. Rainier
DOI:10.1002/chem.200500994
日期:2006.2.8
detailed our synthesis of the gambierol A-C and F-H ring precursors. Reported herein is a description of the coupling of the two precursors and the conversion of the coupled material into gambierol. Coupling of the subunits involved ester formation, enol ether RCM, and mixed thioketal formation and reduction. By employing this strategy we were able to bring highly advanced subunits into the coupling and, as
Total Synthesis of (±)-Mycothiazole and Formal Enantioselective Approach
作者:Alexandre Le Flohic、Christophe Meyer、Janine Cossy
DOI:10.1021/ol047603q
日期:2005.1.1
[Reaction: see text] A totalsynthesis of (+/-)-mycothiazole and a formal enantioselective approach have been achieved from 2,4-dibromothiazole. A chain extension of a homoallylic alcohol proceeding through an unsaturated sultone intermediate, generated by ring-closing metathesis, was used as a key step for the elaboration of the conjugated (Z)-dienol moiety.