Enhanced Stereoselectivity in Photoelectrocyclization of Tropolone Ethers via Confinement in Chiral Inductor-Modified Lyotropic Liquid Crystals
作者:Feng-Feng Lv、Bin Chen、Li-Zhu Wu、Li-Ping Zhang、Chen-Ho Tung
DOI:10.1021/ol800362c
日期:2008.8.21
Photochemistry of tropolone methyl ether (1) and optically pure (S)-tropolone-2-methylbutyl ether (4) has been examined in lyotropic liquid crystals (LCs) in the presence of a chiral inductor. LCs significantly enhance the influence of chiral inductors during the photoelectrocyclization of the tropolone ethers. Chiral inductors that lead to 1:1 mixtures of enantiomers or diastereomers in solution give products in up to 40% enantiomeric excess for 1 and 35% diastereomeric excess for 4 in LCs.