New chiral phosphoramidites with an amide moiety were used for iridium-catalyzed asymmetric allylicalkylation reactions. The best results were obtained with a ligand bearing an oxazolidinone moiety. The reaction of cinnamyl acetate with diethyl sodiomalonate without the use of lithium chloride gave the branched product with 94% ee.
Dual Ni/Organophotoredox Catalyzed Allylative Ring Opening Reaction of Oxabenzonorbornadienes and Analogs
作者:Abdoul G. Diallo、Déborah Paris、Djiby Faye、Sylvain Gaillard、Mark Lautens、Jean-Luc Renaud
DOI:10.1021/acscatal.2c00512
日期:2022.3.18
A general approach for the allylation of oxa- and azabenzonorbornadienes is reported by merging organophotoredox and nickel catalysis. This methodology allowed the diastereoselective allylation of various heterocyclic alkene derivatives with a broader range of allylic acetate compounds compared to previously published procedures. Moreover, no air-sensitive organometallic species and no metal reductants
Cation Control of Diastereoselectivity in Iridium-Catalyzed Allylic Substitutions. Formation of Enantioenriched Tertiary Alcohols and Thioethers by Allylation of<i>5H</i>-Oxazol-4-ones and<i>5H</i>-Thiazol-4-ones
作者:Wenyong Chen、John F. Hartwig
DOI:10.1021/ja410650e
日期:2014.1.8
corresponding magnesium enolates with high diastereoselectivity. The allylation of substituted 5H-oxazol-4-ones provides rapid access to enantioenriched tertiary α-hydroxy acid derivatives unavailable through Mo-catalyzed allylicsubstitution. The allylation of substituted 5H-thiazol-4-ones provides a novel method to synthesize enantioenriched tertiary thiols and thioethers. The observed cation effect implies
我们报告了由金属环铱配合物催化的取代 5H-恶唑-4-酮和 5H-噻唑-4-酮的高度非对映选择性和对映选择性烯丙基化。通过使用相应的烯醇锌,以高非对映选择性发生取代的 5H-恶唑-4-酮的对映选择性 Ir 催化烯丙基化反应;取代的 5H-噻唑-4-酮的对映选择性 Ir 催化烯丙基化与相应的镁烯醇化物一起发生,具有高非对映选择性。取代的 5H-恶唑-4-酮的烯丙基化可快速获得通过 Mo 催化的烯丙基取代无法获得的对映体富集的叔 α-羟基酸衍生物。取代的 5H-噻唑-4-酮的烯丙基化提供了一种合成富含对映体的叔硫醇和硫醚的新方法。
Regioselective Deaminative Allylation of Aliphatic Amines via Dual Cobalt and Organophotoredox Catalysis
C–C bond-forming reactions using Katritzky salts, their deaminative allylation remains a challenge. Inspired by the metallaphotoredox-catalyzed allylicsubstitution regime, here, we report the deaminative allylation of Katritzky salts via cobalt/organophotoredox dual catalysis. This cross-electrophile coupling enables regioselective allylation using a variety of allylic esters, overcoming the substrate
An efficient Pd‐catalyzedthree‐componentcoupling reaction of allyl carboxylates, norbornenes and diboronates is described, which allows efficient assembly of C(sp3)—C(sp3) and C(sp3)—B bonds in a single process. Moreover, this approach shows advantages of good chemo‐ and regioselectivity, as well as good substrates suitability.