Facile Synthesis and Isolation of Secondary Amines <i>via</i>
a Sequential Titanium(IV)-Catalyzed Hydroamination and Palladium-Catalyzed Hydrogenation
作者:Erica K. J. Lui、Laurel L. Schafer
DOI:10.1002/adsc.201500861
日期:2016.3.3
alkyl‐substituted secondary amines has been developed. Using a bis(amidate)bis(amido)titanium(IV) precatalyst, the hydroamination of terminal alkynes with a range of amines results in the selective formation of the anti‐Markovnikov product. The crude enamine/imine mixtures are effectively hydrogenated using palladium on carbon (Pd/C) and H2 to afford the corresponding secondary amine in excellent yields.
<i>N</i>-Silylenamines as Reactive Intermediates: Hydroamination for the Modular Synthesis of Selectively Substituted Pyridines
作者:Erica K. J. Lui、Daniel Hergesell、Laurel L. Schafer
DOI:10.1021/acs.orglett.8b02703
日期:2018.11.2
modular and selective synthesis of mono-, di-, tri-, tetra-, and pentasubstituted pyridines is reported. Hydroamination of alkynes with N-silylamine using a bis(amidate)bis(amido)titanium(IV) precatalyst furnishes the regioselective formation of N-silylenamines. Addition of α,β-unsaturated carbonyls to the crude mixtures followed by oxidation affords 47 examples of pyridines in yields of up to 96%
Titanium-Catalyzed Hydroamination of an Organometallic Acetylide to Access Copper Enamides
作者:Han Hao、Laurel L. Schafer
DOI:10.1021/acs.organomet.1c00416
日期:2021.10.11
In the presence of a bis-amidate bis-amido titanium precatalyst, an NHC-supported Cu acetylide was reacted with p-toluidine to cleanly generate a Cu enamido complex. The organometallic product of hydroamination was fully characterized, including X-ray single-crystal diffraction. Mechanistic investigations were undertaken to test the hypothesis that this organometallic reagent is compatible with a [2
在双酰胺双酰胺钛预催化剂的存在下,NHC 负载的铜乙炔化物与对甲苯胺反应,干净地生成铜烯酰胺络合物。加氢胺化的有机金属产物得到了充分表征,包括 X 射线单晶衍射。进行了机理研究以测试这种有机金属试剂与早期过渡金属催化加氢胺化的 [2 + 2] 环加成机制相容的假设。这代表了这种钛预催化剂出乎意料的官能团兼容性。
Regio- and Stereoselective Hydroamination of Alkynes Using an Ammonia Surrogate: Synthesis of <i>N</i>-Silylenamines as Reactive Synthons
作者:Erica K. J. Lui、Jason W. Brandt、Laurel L. Schafer
DOI:10.1021/jacs.7b13783
日期:2018.4.18
An anti-Markovnikov selective hydroamination of alkynes with N-silylamines to afford N-silylenamines is reported. The reaction is catalyzed by a bis(amidate)bis(amido)Ti(IV) catalyst and is compatible with a variety of terminal and internal alkynes. Stoichiometric mechanistic studies were also performed. This method easily affords interesting N-silylenamine synthons in good to excellent yields and