Cycloisomerization of Acetylenic Vinyllithiums: Sequential Anionic Cyclization-Cycloaddition as a Route to Polycyclic Ring Systems
作者:Timo V. Ovaska、Rachel R. Warren、Carl E. Lewis、Nanette Wachter-Jurcsak、William F. Bailey
DOI:10.1021/jo00099a010
日期:1994.10
Acetylenic vinyllithiums, generated by low-temperature metal-halogen exchange, were found to undergo facile 5-exo-dig cyclization to afford isomerically pure conjugated 1,3-bis-exocyclic dienes which serve as reactive precursors to complex polycyclic materials through subsequent Diels-Alder methodology.
作者:William F. Bailey、Nanette M. Wachter-Jurcsak、Mark R. Pineau、Timo V. Ovaska、Rachel R. Warren、Carl E. Lewis
DOI:10.1021/jo961437l
日期:1996.11.15
terminal acetylenic carbon. The highly reactive bis-exocyclic 1,3-dienes serve as precursors to polycyclic materials through subsequent Diels-Alder reaction with a wide variety of dienophiles. The consecutive exchange-cyclization-cycloaddition methodology, which can be conducted in one pot without isolation of intermediates, provides an efficient, operationally simple, and diastereoselective route to diverse
Zirconocene-Induced Cocyclisation/Elimination Reactions of 2-Heterosubstituted 1,6-Dienes and 1,6-Enynes
作者:Richard J. Whitby、David R. Owen
DOI:10.1055/s-2005-870029
日期:——
Zirconocene-mediated cocyclisation of 2-heterosubstituted-1,6-dienes and -enynes gave zirconacycles bearing an endocyclic β-leaving group which eliminated under the reaction conditions to provide exocyclic alkylidene groups. The scope of this cyclisation/elimination has been investigated along with further elaboration of the monosubstituted zirconocene intermediates by insertion of alkenyl carbenoids.