Stereoselective Synthesis of [3.3.0]‐Fused γ‐Butyrolactones of Carbohydrates
摘要:
A facile and stereoselective method is described for the preparation of fused 2,3-gamma-butyrolactones of lyxofuranose from the unexpected rearrangement in basic media of the photocycloadduct between homochiral 2(5H)-furanones and vinylene carbonate.
Stereoselective Synthesis of [3.3.0]‐Fused γ‐Butyrolactones of Carbohydrates
摘要:
A facile and stereoselective method is described for the preparation of fused 2,3-gamma-butyrolactones of lyxofuranose from the unexpected rearrangement in basic media of the photocycloadduct between homochiral 2(5H)-furanones and vinylene carbonate.
Regio- and diastereoselectivity studies on the photocycloaddition of ketene diethyl acetal to chiral 2(5H)-furanones
作者:Albert Rustullet、Marta Racamonde、Ramon Alibés、Pedro de March、Marta Figueredo、Josep Font
DOI:10.1016/j.tet.2008.07.082
日期:2008.9
The photochemical [2+2] cycloaddition of 1,1-diethoxyethylene to chiral 2(5H)-furanones is investigated. The effect of the substituents of the lactone and the polarity of the solvents on the chemical yield, regioselectivity, and facial diastereoselectivity is evaluated. The reactions in ether proceed with excellent regioselectivity and good yields. Hydrolysis of the ketal group of the major cycloadducts
A facile and stereoselective method is described for the preparation of fused 2,3-gamma-butyrolactones of lyxofuranose from the unexpected rearrangement in basic media of the photocycloadduct between homochiral 2(5H)-furanones and vinylene carbonate.