highly stereoselectiveaccess to (E)-β-amidovinyl sulfones in moderate to excellent yields. The reaction proceeds readily under mild conditions at room temperature and tolerates various sensitive functional groups. This process affords exclusively (E)-configurated β-amidovinyl sulfones independent of the starting material configuration. Moreover, a direct transformation of organolithiumreagents and sulfur
ring-opened hydrosilylated adducts through carbon–carbon (C–C) bond cleavage of the cyclopropane ring. The regioselectivity of the addition of silanes (linear or branched) can be switched by changing the monophosphine ligand. This C–C bond cleavage/hydrosilylation methodology is applicable to the synthesis of silanediol precursors.
A highly modular, diastereoselective one-pot-synthesis of 1,3-diamines with three contiguous stereogenic centers is reported. Our method provides a fast and efficient access to 1,2-anti-2,3-anti-1,3-diamines from three readily available building blocks. This Bi(OTf)3-catalyzed reaction is insensitive to air and moisture and can be performed on a multigram scale.
Easy access to enamides: a mild nickel-catalysed alkene isomerization of allylamides
作者:Lu Wang、Chao Liu、Ruopeng Bai、Yani Pan、Aiwen Lei
DOI:10.1039/c3cc43875a
日期:——
The first Ni-catalysed alkene isomerization of allylamides for the synthesis of enamides was demonstrated. Various substituted N-allylamides were found to be suitable substrates for this isomerization. Isotopic labelling experiments showed that it is an intramolecular hydrogen transfer process.
Enantio‐ and Diastereoselective NiH‐Catalyzed Hydroalkylation of Enamides or Enecarbamates with Racemic <i>α</i>‐Bromoamides**
作者:Jian Chen、Lifu Wu、Yue Zhao、Shaolin Zhu
DOI:10.1002/anie.202311094
日期:2023.10.26
A regio-, enantio-, and diastereoselective NiH-catalyzed hydroalkylation of enamides or enecarbamates with racemic α-bromoamides or Katritzky salts with full control of the newly formed vicinal stereocenters is reported. A wide variety of enantio- and diastereomerically enriched chiral β-aminoamides and their derivatives were directly obtained through a key sequential process of enantioselective h