作者:Hubert Angert、Thomas Kunz、Hans-Ulrich Reissig
DOI:10.1016/0040-4020(92)80019-c
日期:1992.7
Additions of silyl enol ethers, 3, 6, and 8 to chiral β-formyl esters 1 in the presence of TiCl4 provide trans-γ-lactones 4, 7, and 9 in high yield and with good to excellent diastereofacial selectivity. This high trans-preference is due to effective chelate-control involving seven-membered ring 1-TiCl4 complexes.
的甲硅烷基烯醇醚,添加3,6,和8至手性β甲酰基酯1中的TiCl存在4提供反-γ内酯4,7和9以高收率和以良好至优异的diastereofacial选择性。该高反式偏好是由于涉及七元环1 - TiCl 4络合物的有效螯合控制。