An efficient and facile method for the preparation of alkynamides through Et3N-catalyzed alumination of alkyl- or aryl-substituted terminal alkynes with AlMe3 and sequential nucleophilic addition of in situ generated alkynylaluminums to isocyanates is described. This method has the merits of using readily available isocyanates and monosubstituted alkynes, easy access to organoaluminums, short reaction
描述了一种通过 Et 3 N 催化用 AlMe 3对烷基或芳基取代的末端炔烃进行铝化以及将原位生成的炔基铝连续亲核加成到异氰酸酯上来制备炔酰胺的有效且简便的方法。该方法具有使用易得的异氰酸酯和单取代炔烃、有机铝易获得、反应时间短、效率高等优点。所需炔酰胺的克级合成及其在 α-亚甲基-β-内酰胺形成中的应用证明了该方法的合成效用。
Co(II)/Ag(I) Synergistically Catalyzed Monoinsertion Reaction of Isocyanide to Terminal Alkynes with H<sub>2</sub>O: Synthesis of Alkynamide Derivatives
作者:Rong Zhang、Zheng-Yang Gu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.8b02516
日期:2018.9.7
with terminal alkyne and water to afford alkynamide derivatives is reported. The insertion of monoisocyanide into the C–H bond of terminal alkynes is an efficient, straightforward, atom-economical route to alkynamides, which are useful synthons in organic synthesis. This synergistic process achieves the cleavage of a C–H bond and the construction of new C–C and C═O bonds under mild conditions through the
Three in one: A highly efficient and mild PdII‐catalyzed carboesterification of alkenes with carboxylic alkyne derivatives proceeds through a domino‐type alkyne–alkene coupling/CO‐bond formation (see scheme). The stereoselectivity is controlled by the choice of substrates and temperature. The reaction provides a convenient method for the construction of naturally occurring biologically active compounds
Visible Light-Induced Co- or Cu-Catalyzed Selenosulfonylation of Alkynes: Synthesis of β-(Seleno)vinyl Sulfones
作者:Rong Zhang、Pei Xu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.joc.9b01626
日期:2019.10.4
A visible light-induced Co- or Cu-catalyzed selenosulfonylation of alkynes for the synthesis of β-(seleno)vinyl sulfones is demonstrated. This method utilizes a low-cost cobalt salt or metal copper as the catalysts. The reaction goes through a photoinduced freeradical addition of selenosulfonates to alkynes for the 1,2-selenosulfonylation of alkynes undermildconditions.
<i>trans</i>-Hydroboration of Propiolamides: Access to Primary and Secondary (<i>E</i>)-β-Borylacrylamides
作者:R. Justin Grams、Russell G. Fritzemeier、Carla Slebodnick、Webster L. Santos
DOI:10.1021/acs.orglett.9b02408
日期:2019.9.6
A base-mediated trans-hydroboration of propiolamides that provides access to previously elusive primary and secondary (E)-β-borylacrylamide products has been developed. In the presence of n-butyllithium and pinacolborane, complete regioselectivity and stereoselectivity is observed, affording the corresponding vinylboronate products in up to 91% yield. A wide variety of primary and secondary amides