Stereodivergent Synthesis of (+)- and (−)-Isolineatin
摘要:
A stereodivergent approach to (+)- and (-)-isolineatin using (S)-4-methyl-5-pivaloyloxymethyl-2(5H)-furanone as the single source of asymmetry by exploiting the inherent chirality at the C-5 stereocenter is described.
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