Stereoselective alkyne semihydrogenations with an air-stable copper(<scp>i</scp>) catalyst
作者:Niklas O. Thiel、Johannes F. Teichert
DOI:10.1039/c6ob02271e
日期:——
An air-stable and preactivated copper(I) hydroxide/N-heteroyclic carbene (NHC) complex for alkynesemihydrogenations is reported. Next to an enhanced practicability of the process, the resulting alkenes are obtained with high Z-selectivities and no overreduction to the corresponding alkanes.
Novel Synthesis of Disubstituted Alkyne Using Molybdenum Catalyzed Cross-Alkyne Metathesis
作者:Naotake Kaneta、Ken Hikichi、Shin-ichi Asaka、Motokazu Uemura、Miwako Mori
DOI:10.1246/cl.1995.1055
日期:1995.11
A novel disubstitutedalkyne synthesis was developed using molybdenum catalyzed cross-alkyne metathesis by Mortreux’s catalyst [Mo(CO)6-p-ClC6H4OH]. The reaction was carried out using Mo(CO)6 (5 mol% for total amounts of alkynes) and p-ClC6H4OH (1 equiv.) in the presence of an excess amount of another alkyne (3∼11 equiv.) in refluxing toluene.
Copper(<scp>i</scp>)-catalysed transfer hydrogenations with ammonia borane
作者:Eva Korytiaková、Niklas O. Thiel、Felix Pape、Johannes F. Teichert
DOI:10.1039/c6cc09067b
日期:——
Highly Z-selective alkyne transfer semihydrogenations and conjugate transferhydrogenations of enoates can be effected by employing a readily available copper(I)/N-heterocyclic carbene (NHC) complex, [IPrCuOH], in combination with ammoniaborane as a H2 equivalent.
<i>Z</i>
‐Selective Copper(I)‐Catalyzed Alkyne Semihydrogenation with Tethered Cu–Alkoxide Complexes
作者:Felix Pape、Niklas O. Thiel、Johannes F. Teichert
DOI:10.1002/chem.201501739
日期:2015.11.2
A highly stereoselective alkynesemihydrogenation with copper(I) complexes is reported. Copper–N‐heterocyclic carbene complex catalysts, bearing an intramolecular CuO bond, allow for the direct transfer of both hydrogen atoms from dihydrogen to the alkyne. The corresponding alkenes can be isolated with high Z selectivity and negligible overreduction to the alkane.