Stereoselective reactions of AlMe3 with chiral acyclic β-ketosulfoxides.
摘要:
The results obtained in the addition reactions of AlMe3 to acyclic beta-ketosulfoxides 1-5 are described. In the presence of ZnX2 (X=Cl,Br) reactions proceed in high yield. The diastereoselectivities achieved, ranging from 70% to 90%, make these reactions useful for the asymmetric synthesis of tertiary methyl carbinols.
Substituent Effect on the Enantioface-Differentiating Reaction of (<i>R</i>)-[Lithiomethyl<i>p</i>-Tolyl Sulfoxide] with<i>m</i>- or<i>p</i>-Substituted Acetophenones
作者:Norio Kunieda、Junzo Nokami、Masayoshi Kinoshita
DOI:10.1246/bcsj.65.526
日期:1992.2
When lithiomethyl p-tolyl sulfoxide derived from (R)-(+)-[methyl p-tolyl sulfoxide] was allowed to react with acetophenones which have a variety of m- or p-substituents, the corresponding diastereometic mixture of β-hydroxy sulfoxides (RsSc and RsRc) was produced. The degree of enantioselectivity was affected by the nature of the substituent on benzene ring. The logarithms of the RsSc/RsRc values thus