Diastereoselective Synthesis of CF3-Substituted, Epoxide-Fused Heterocycles with β-(Trifluoromethyl)vinylsulfonium Salts
摘要:
CF3-substituted vinyl diphenylsulfonium triflate is an effective annulation reagent for the formation of alpha-CF3 substituted, epoxide-fused heterocycles (pyrrolidines, piperidines, and tetrahydrofurans). This simple method affords a variety of valuable heterocyclic building blocks in a highly diastereoselective manner (dr>20:1).
Stereoselective Synthesis of 3-Hydroxyproline Benzyl Esters from <i>N</i>-Protected β-Aminoaldehydes and Benzyl Diazoacetate
作者:Steven R. Angle、Dominique S. Belanger
DOI:10.1021/jo030360f
日期:2004.6.1
benzyl esters from α-alkyl and α-alkoxy N-protected aminoaldehydes with benzyl diazoacetate is described. Aldehydes with α-alkyl substituents afforded prolines as a single diastereomer with a trans-cis relative configuration in 14−77%. An α-tert-butyldimethylsilyloxy aminoaldehyde afforded a proline as a single diastereomer with a trans-trans relative configuration in 37% yield.
Diastereoselective Synthesis of CF<sub>3</sub>-Substituted, Epoxide-Fused Heterocycles with β-(Trifluoromethyl)vinylsulfonium Salts
作者:Sven P. Fritz、Thomas H. West、Eoghan M. McGarrigle、Varinder K. Aggarwal
DOI:10.1021/ol303200n
日期:2012.12.21
CF3-substituted vinyl diphenylsulfonium triflate is an effective annulation reagent for the formation of alpha-CF3 substituted, epoxide-fused heterocycles (pyrrolidines, piperidines, and tetrahydrofurans). This simple method affords a variety of valuable heterocyclic building blocks in a highly diastereoselective manner (dr>20:1).