A highly efficient total synthesis of (R)-(+)-muscopyridine by intramolecular [4+2] cycloaddition of bisketene
作者:Kie Suwa、Yasuko Morie、Yumiko Suzuki、Kiyoshi Ikeda、Masayuki Sato
DOI:10.1016/j.tetlet.2007.12.112
日期:2008.2
A highly efficienttotalsynthesis of (R)-(+)-muscopyridine 1 has been accomplished in 12 steps with 40% overall yield. A highlight of the synthesis is the intramolecular [4+2] cycloaddition of bisketene to afford a bridged pyrone and ring transformation of the pyrone to afford pyridine derivatives.
Synthesis of the polyether antibiotic monensin. 2. Preparation of intermediates
作者:David B. Collum、John H. McDonald、W. Clark Still
DOI:10.1021/ja00526a074
日期:1980.3
Chiral Lewis Acid-Catalyzed Enantioselective Intramolecular Carbonyl Ene Reactions of Unsaturated α-Keto Esters
作者:Dan Yang、Min Yang、Nian-Yong Zhu
DOI:10.1021/ol035486d
日期:2003.10.1
[reaction: see text] Chiral Lewis acid-promoted highly enantioselective intramolecular carbonyl enereactions of unsaturated alpha-keto esters have been investigated. In the presence of chiral Lewis acids such as [Sc((R,R)-Ph-pybox)](OTf)(3) and [Cu((S,S)-Ph-box)](OTf)(2), several unsaturated alpha-keto esters underwent carbonyl enereactions in CH(2)Cl(2) at room temperature to give monocyclic products