Evidence for Atropisomerism in Polycyclic γ‐Butenolides: Synthesis, Scope, and Spectroscopic Studies
作者:Debayan Roy、Beeraiah Baire
DOI:10.1002/chem.202005174
日期:2021.2.24
Design and development of a domino cyclative approach for the synthesis of new polycyclic γ‐butenolides from β‐aryl‐Z‐enoate propargylic alcohols, through the interception of an intermediate of the Z‐enoate‐assisted Meyer–Schuster rearrangement, has been reported. A systematic NMR analysis of various derivatives of this class revealed and supported the potential atropisomerism associated with them
A Serendipitous Synthesis of Bis-Heterocyclic Spiro 3(2<i>H</i>)-Furanones
作者:Alfredo Picado、ShengJian Li、R. Karl Dieter
DOI:10.1021/acs.joc.5b02350
日期:2016.2.19
(Z) Enol triflates 6, 11b–d, (E) enol triflate 11e, and phenol triflate 11a, derived from β-keto esters or 2-carboalkoxy phenols, respectively, react with N-Boc 2-lithiopyrrolidine (5a), N-Boc N-methylaminomethyllithium (5b), or 2-lithio-1,3-dithiane (14) to afford 3(2H)-furanones in modest to good yields (38–81%). Product and carbanion reagent studies suggest that the 3(2H)-furanone is formed in a
Stereoselective Synthesis of Acetoacetate-Derived Enol Triflates
作者:David Babinski、Omid Soltani、Doug E. Frantz
DOI:10.1021/ol8010002
日期:2008.7.3
A highly stereoselective method for preparing ( Z)- and ( E)-enol triflates derived from substituted acetoacetate derivatives is described. The salient feature of this methodology is the use of Schotten-Baumann-type conditions to control enolate geometry using either aqueous LiOH ( Z-selective) or aqueous (Me)(4)NOH ( E-selective) in combination with triflic anhydride to provide a practical and predictable
Convenient Synthesis of Electron Deficient Dienes via Pd(0) Catalyzed Coupling
作者:Hwa-Ok Kim、Cyprian O. Ogbu、Sherry Nelson、Michael Kahn
DOI:10.1055/s-1998-1885
日期:1998.10
The convenient preparation of 1,6-dicarbonyl-2,4-butadienes by the coupling of enol triflates with α,β-unsaturated carbonyls in the presence of Pd(PPh2)2Cl2 is described.