Rhodium-catalyzed regio- and enantioselective amination of racemic secondary allylic trichloroacetimidates with N-methyl anilines
作者:Jeffrey S. Arnold、Gregory T. Cizio、Drew R. Heitz、Hien M. Nguyen
DOI:10.1039/c2cc36961c
日期:——
We report the chiral diene ligated rhodium-catalyzed dynamic kinetic asymmetric transformation (DYKAT) of racemic secondary allylic trichloroacetimidates with a variety of N-methyl anilines, providing allylic N-methyl arylamines in high yields, regioselectivity, and enantiomeric excess. The rhodium-catalyzed DYKAT method addresses limitations previously associated with this particular class of aromatic
Rhodium-Catalyzed Sequential Allylic Amination and Olefin Hydroacylation Reactions: Enantioselective Synthesis of Seven-Membered Nitrogen Heterocycles
作者:Jeffrey S. Arnold、Edward T. Mwenda、Hien M. Nguyen
DOI:10.1002/anie.201310354
日期:2014.4.1
Dynamic kinetic asymmetric amination of branched allylic acetimidates has been applied to the synthesis of 2‐alkyl‐dihydrobenzoazepin‐5‐ones. These seven‐membered‐ring aza ketones are prepared in good yield with high enantiomeric excess by rhodium‐catalyzed allylic substitution with 2‐amino aryl aldehydes followed by intramolecularolefin hydroacylation of the resulting alkenals. This two‐step procedure
Iridium-Catalyzed Radiosynthesis of Branched Allylic [<sup>18</sup>F]Fluorides
作者:Jason C. Mixdorf、Alexandre M. Sorlin、David W. Dick、Hien M. Nguyen
DOI:10.1021/acs.orglett.8b03496
日期:2019.1.4
The rapid and operationally simple radiosynthesis of branched allylic [18F]fluorides bearing a variety of functional groups, via iridium-catalyzed nucleophilic substitution reaction utilizing allylic trichloroacetimidates and [18F]KF·Kryptofix[2.2.2] complex in 5-15 min at room temperature, is reported. The versatility of the allyl functional group of the resulting radiofluorinated products offers
Iridium-Catalyzed Enantioselective Fluorination of Racemic, Secondary Allylic Trichloroacetimidates
作者:Qi Zhang、David P. Stockdale、Jason C. Mixdorf、Joseph J. Topczewski、Hien M. Nguyen
DOI:10.1021/jacs.5b07492
日期:2015.9.23
The Ir-catalyzed enantioselective fluorination of racemic, branched allylic trichloroacetiinidates with Et3N center dot 3HF is a mild and efficient route for selective incorporation of fluoride ion into allylic systems. We herein describe the asymmetric fluorination of racemic, secondary allylic electrophiles with Et3N center dot 3HF using a chiral-diene-ligated Ir complex. The methodology enables the formation of acyclic fluorine-containing compounds in good yields with excellent levels of asymmetric induction and overcomes the limitations previously associated with the eiiantioselective construction of secondary allylic fluorides bearing alpha-linear substituents.