Stereoselective TiCl<sub>4</sub>-Promoted Nucleophilic Substitution at C-2 of (4<i>S</i>,5<i>S</i>)-2-Alkyl-4-methyl-5-trifluoromethyl-1,3-dioxolanes
作者:Carlo F. Morelli、Lavinia Durì、Alberto Saladino、Giovanna Speranza、Paolo Manitto
DOI:10.1055/s-2004-834884
日期:——
ring-opening reactions of chiral acetals derived from (2S,3S)-1,1,1-trifluorobutane-2,3-diol proceed in a completely regioselective manner, leading to the break of the O1-C2 bond accompanied by a high degree of stereoselectivity. The use of triethylsilyl deuteride or allyltributyltin as nucleophiles gives access, after removal of the chiral auxiliary, to stereoselectively deuterated primary alcohols or homoallylic
由 (2S,3S)-1,1,1-三氟丁烷-2,3-二醇衍生的手性缩醛的 TiCl 4 介导的亲核开环反应以完全区域选择性的方式进行,导致 O1-C2 键断裂伴随着高度的立体选择性。使用三乙基甲硅烷基氘化物或烯丙基三丁基锡作为亲核试剂,在去除手性助剂后,可以分别获得具有高对映体过量的立体选择性氘代伯醇或高烯丙基仲醇。