Highly Stereoselective Syntheses of All 1,2,3-<i>Me,OH,Me</i>Triads<i>via</i>Asymmetric Hydrogenation Reactions
作者:Ye Zhu、Kevin Burgess
DOI:10.1002/adsc.201200709
日期:2013.1.14
Iridium‐catalyzed asymmetric hydrogenations of chiral alkenes were used to access four pivotal α,ω‐functionalized chirons, that contain widely occurring stereochemical 1,2,3‐Me,OH,Me motifs. A chiral analogue of Crabtree’s catalyst was used in key hydrogenation steps to form these motifs with high stereochemical purities. An application of one of these chirons is illustrated here with a synthesis of
Diastereoselective [2,3] Wittig rearrangement of tertiary α-lithio ethers
作者:Michael Balestra、James Kallmerten*
DOI:10.1016/s0040-4039(00)88470-1
日期:1988.1
Tertiary allylic methyl(tri-n-butylstannyl) ethers undergo transmetallation and subsequent diastereoselectve [2,3] Wittigrearrangement, wherein chirality transfer and olefin selectivity for the [2,3] sigmatropic event is mediated by a stereogenic center external to the sigmatropic framework.