Titanocene(III) Chloride Mediated Radical-Induced Addition to Baylis−Hillman Adducts: Synthesis of (E)- and (Z)-Trisubstituted Alkenes and α-Methylene/Arylidene δ-Lactones
摘要:
Baylis-Hillman adduct underwent smooth radical-induced condensation with activated bromo compounds and epoxides using titanocene(III) chloride (CP2TiCl) as the radical generator. The reactions of activated bromo compounds with 3-acetoxy-2-methylene alkanoates provided (E)-alkenes exclusively, whereas similar reactions with 3-acetoxy-2-methylenealkanenitriles led to (Z)-alkenes as the major product. The reactions of epoxides with Baylis-Hillman adduct furnished alpha-methylene/arylidene-delta-lactones in good yield via addition followed by in situ lactonization.
Fe(III) chloride catalyzed conversion of epoxides to acetonides
作者:Sumit Saha、Samir Kumar Mandal、Subhas Chandra Roy
DOI:10.1016/j.tetlet.2008.07.147
日期:2008.10
A mild and efficient method for the preparation of acetonidesfromepoxidescatalyzed by iron(III) chlorides has been developed.
已经开发了一种温和而有效的方法,用于从氯化铁(III)催化的环氧化物制备乙炔化物。
Titanocene(III) Chloride Mediated Radical-Induced Addition to Baylis−Hillman Adducts: Synthesis of (<i>E</i>)- and (<i>Z</i>)-Trisubstituted Alkenes and α-Methylene/Arylidene δ-Lactones
作者:Samir K. Mandal、Moumita Paira、Subhas C. Roy
DOI:10.1021/jo800049p
日期:2008.5.1
Baylis-Hillman adduct underwent smooth radical-induced condensation with activated bromo compounds and epoxides using titanocene(III) chloride (CP2TiCl) as the radical generator. The reactions of activated bromo compounds with 3-acetoxy-2-methylene alkanoates provided (E)-alkenes exclusively, whereas similar reactions with 3-acetoxy-2-methylenealkanenitriles led to (Z)-alkenes as the major product. The reactions of epoxides with Baylis-Hillman adduct furnished alpha-methylene/arylidene-delta-lactones in good yield via addition followed by in situ lactonization.