γ-Lactone-Tethered Ring-Closing Metathesis. A Route to Enantiomerically Enriched γ-Lactones α,β-Fused to Medium-Sized Rings
作者:Carmen M. Rodríguez、José Luis Ravelo、Víctor S. Martín
DOI:10.1021/ol0478739
日期:2004.12.1
[reaction: see text] The stereoselective alkylation of alpha-(phenylsulfonyl)-beta-[(methoxycarbonyl)methyl]-gamma-lactones obtained by the base-induced cyclization of enantiomerically enriched alpha-[(phenylthio)acyl]-alpha,beta-unsaturated esters and ring-closing olefin metathesis (RCM) are the basis of a new approach for gaining access to gamma-lactones that are alpha,beta-fused to medium-sized
Stereoselective Synthesis of Highly Substituted .gamma.-Lactones and Butenolides by Intramolecular Michael Addition of Enantiomerically Enriched .gamma.-[(Phenylthio)acyl]oxy .alpha.,.beta.-Unsaturated Esters
作者:Carmen M. Rodriguez、Tomas Martin、Miguel A. Ramirez、Victor S. Martin
DOI:10.1021/jo00095a022
日期:1994.8
The synthesis of polysubstituted gamma-lactones by the base-induced cyclization of enantiomerically enriched gamma-((phenylthio)acyl)oxy alpha,beta-unsaturated esters obtained from 2,3-epoxy alcohols is described. The procedure is highly stereoselective and compatible with a wide range of functionalities (ester, tetrahydropyranyl ether, silyl ether, etc.). Varying degrees of substitution, including quaternary centers, in the final gamma-lactone were synthesized with excellent stereoselectivity. Useful functional interconversions were successfully demonstrated, in particular those resulting in butenolides. By the use of AM1 it was concluded that the intramolecular Michael reaction can be described as a kinetically controlled reaction in which the relative stability of the transition states for all possible final configurations led to geometries in agreement with the experimental results.
An approach to the stereocontrolled synthesis of polysubstituted chiral butenolides and γ-lactones
作者:Carmen Ma Rodríguez、Victor S. Martín
DOI:10.1016/s0040-4039(00)71265-2
日期:1991.5
The enantioselective synthesis of polysubstituted butenolides and gamma-lactones by an intramolecular Michael addition of chiral thiophenylacetates of gamma-hydroxy-alpha,beta-unsaturated esters is described.
Rodriguez Carmen M., Martin Tomas, Ramirez Miguel A., Martin iVictor S., J. Org. Chem, 59 (1994) N 16, S 4461-4472
作者:Rodriguez Carmen M., Martin Tomas, Ramirez Miguel A., Martin iVictor S.
DOI:——
日期:——
γ-Lactones as templates in ring-closing metathesis: Enantioselective synthesis of medium sized carbocycles fused to butyrolactones
作者:José Luis Ravelo、Carmen Ma Rodríguez、Víctor S. Martín