Stereoselective Synthesis of<i>trans</i>-2,5-Disubstituted Tetrahydrofurans<i>via</i>the Lewis Acid Mediated Reduction of Cyclic Hemiketals with Triphenylsilane
作者:Yutaka Nishiyama、Takashi Tujino、Tadamichi Yamano、Masayoshi Hayashishita、Kazuyoshi Itoh
DOI:10.1246/cl.1997.165
日期:1997.2
An efficient method for the synthesis of trans-2,5-disubstituted tetrahydrofuran derivatives has been developed. Dithioacetal-functionalized cyclic hemiketals are reduced by triphenylsilane (Ph3SiH) in the presence of TiCl4 to afford the corresponding trans-2,5-disubstituted tetrahydrofuran derivatives in good yield and high stereoselectivity. Asymmetrical synthesis of (2S,5S) disubstituted tetrahydrofuran
已开发出一种合成反式-2,5-二取代四氢呋喃衍生物的有效方法。二硫缩醛官能化环状半缩酮在 TiCl4 存在下被三苯基硅烷 (Ph3SiH) 还原,以良好的收率和高立体选择性得到相应的反式-2,5-二取代四氢呋喃衍生物。(2S,5S)双取代四氢呋喃的不对称合成也通过使用这种还原方法实现。