Gold(I)-catalysed tandem cyclization of propargyl acetals and alkynes
作者:Huey-San Melanie Siah、Morten Christian Hogsnes、Naseem Iqbal、Anne Fiksdahl
DOI:10.1016/j.tet.2015.12.080
日期:2016.2
To expand the understanding of the chemistry of propargyl acetals, their gold(I) catalysed cycloaddition reactions with alkynes have been investigated. We hereby report a novel tandem reaction that allows the construction of a new type of polysubstituted and highly functionalised bicyclic pentalene compounds, 2,6a-dimethoxy-3a-methyl-1,4,5-triphenyl-1,3a,4,6a-tetrahydropentalenes, with four stereogenic
Axial-to-Central Chirality Transfer for Construction of Quaternary Stereocenters via Dearomatization of BINOLs
作者:Xiao-Long Min、Xu-Ran Xu、Ying He
DOI:10.1021/acs.orglett.9b03558
日期:2019.11.15
All-carbonquaternary stereocenters are versatile building blocks, and their asymmetric construction has attracted much attention. Herein, we disclose an axial-to-central chirality transfer strategy for the synthesis of chiralquaternary stereocenters via dearomatization of (S)-BINOLs. The reaction proceeded smoothly with a wide range of propargyl carbonates to afford chiral spiro-compounds in high
Development of a Method for the Preparation of Ruthenium Indenylidene-Ether Olefin Metathesis Catalysts
作者:Leonel R. Jimenez、Daniel R. Tolentino、Benjamin J. Gallon、Yann Schrodi
DOI:10.3390/molecules17055675
日期:——
dicyclohexylphenylphosphine, triisobutylphosphine, triisopropylphosphine, or tri-n-propylphosphine] are described. Several of these reactions allow for the easy, in-situ and atom-economic preparation of olefinmetathesis catalysts. Organic precursor 1-(3,5-dimethoxyphenyl)-1-phenyl-prop-2-yn-1-ol led to the formation of active ruthenium indenylidene-ether complexes, while 1-(3,5-dimethoxyphenyl)-prop-2-yn-1-ol
Gold-Catalyzed Stereocontrolled Synthesis of 2,3-Bis(acetoxy)-1,3-dienes
作者:Xiaogen Huang、Teresa de Haro、Cristina Nevado
DOI:10.1002/chem.200900391
日期:2009.6.8
the stereochemistry: 2,3‐Bis(acetoxy)‐1,3‐dienes are obtained in a stereocontrolled manner by a novel tandem 1,2‐/1,2‐bis(acetoxy) rearrangement (see scheme, R1 and R2 are δ+ stabilizing). Upon stabilization of the reaction intermediates, the ligand attached to gold controls the stereochemistry of the alkene in the second acetate migration, that is, N‐heterocyclic carbenes (NHC) favor cis alkenes, whereas
改变配体,改变立体化学:通过新的串联1,2- / 1,2-双(乙酰氧基)重排以立体控制方式获得2,3-双(乙酰氧基)-1,3-二烯(参见方案, R 1和R 2为δ +稳定化。反应中间体稳定后,与金连接的配体控制了第二次乙酸盐迁移过程中烯烃的立体化学,即N-杂环卡宾(NHC)有利于顺式烯烃,而膦配体则选择性地提供了反式烯烃。
Silver-mediated aminophosphinoylation of propargyl alcohols with aromatic amines and H-phosphine oxides leading to α-aminophosphine oxides
H-phosphine oxides for the construction of α-aminophosphine oxides has been developed. The CN and C P bond could be efficiently formed in one pot operation via sequentialCC and C O bond cleavage of propargylic alcohols. This present methodology, which not only provides a simple and alternative strategy for the synthesis of α-aminophosphine oxides, but also opens a new window for the cleavage reactions of