One-Pot, Three-Step Synthesis of Cyclopropylboronic Acid Pinacol Esters from Synthetically Tractable Propargylic Silyl Ethers
作者:Jonathan A. Spencer、Craig Jamieson、Eric P. A. Talbot
DOI:10.1021/acs.orglett.7b01778
日期:2017.7.21
propargylic silyl ethers can be converted to complex cyclopropylboronic acid pinacol esters in an efficient one-pot procedure. Terminal acetylenes undergo a Schwartz’s reagent catalyzed hydroboration; subsequent addition of further Schwartz’s reagent and Lewis acid-mediated activation of neighboring silyl ether allows cyclization to access a range of cyclopropylboronic acid pinacol esters. The scope includes
and limitations of the copper-catalyzedpropargylicamination of various propargylic esters with amines are presented, where optically active diphosphines such as Cl-MeO-BIPHEP and BINAP work as good chiral ligands. A variety of secondary amines are available as nucleophiles for this catalytic reaction to give the corresponding propargylic amines with a high enantioselectivity. The results of some stoichiometric
electron-deficient conjugated polymer. Mechanistic studies revealed a new α–α selective Cu-catalyzed dimerization pathway of the C3 unit, followed by in situ organocopper-mediated chain-growth propagation. These insights not only provide an important understanding of the Cu-catalyzed CPPE of C3, C4, and C6 monomers in general but also lead to a significantly improved synthesis of polydiynes from simpler
This study describes a cascade method for the synthesis of β-aminoketones through the reductive hydroamination of alkynes under very mild metal-free conditions. It allows for the rapid conversion of ynones and amines into corresponding β-aminoketones with a broad substrate scope and diverse functionalities. This straightforward and easy-to-handle reaction process can be successfully applied for the
Preparation of Thiolate-Bridged Dinuclear Ruthenium Complexes Bearing a Phosphine Ligand and Application to Propargylic Reduction of Propargylic Alcohols with 2-Propanol
Novelthiolate-bridged dinuclear ruthenium complexes bearing a phosphine ligand, [Cp*RuPhP(C6H4-o-S)2}RuCp*](OTf)2, [CpRuPhP(C6H4-o-S)2}RuCp*(OH2)](OTf)2, and [Cp*FePhP(C6H4-o-S)2}RuCp*](OTf)2, are prepared and characterized by X-ray analysis. These dinuclear complexes work as effective catalysts toward propargylic reduction of propargylic alcohols with 2-propanol viaallenylidenecomplexes as key
新颖硫醇盐桥联的双核钌络合物轴承膦配体,混合[Cp *茹比索(C 6 H ^ 4 - ö -S)2 } RuCp *](OTF)2,[CPRU比索(C 6 H ^ 4 - ö - S)2 } RuCp *(OH 2)](OTf)2和[Cp * Fe PhP(C 6 H 4 - o -S)2 } RuCp *](OTf)2通过X射线分析制备和表征。这些双核络合物作为有效的催化剂,通过烯基亚烷基络合物作为关键中间体,以2-丙醇进行炔丙醇的炔丙基还原,以高至高收率得到相应的炔烃。