Planar‐Chiral [2.2]Paracyclophane‐Based Pyridonates as Ligands for Tantalum‐Catalyzed Hydroaminoalkylation
作者:Carolin Braun、Martin Nieger、Stefan Bräse、Laurel L. Schafer
DOI:10.1002/cctc.201900416
日期:2019.11.7
By using planarchiral [2.2]paracyclophane‐containing N,O‐chelating ligands for tantalum‐catalyzedhydroaminoalkylation, one of the most versatile catalytic systems for this reaction to date was obtained. Convenient Csp3−Csp3 bond formation of amines with terminal and internal alkenes was enabled by the same in situ synthesized catalytic system of [2.2]paracyclophane‐basedpyridonates and Ta(CH2TMS)3Cl2
hydroaminoalkylation of terminal alkenes, 1,3‐dienes, or styrenes allows a direct and highly atom efficient (100 %) synthesis of amines which can result in the formation of two regioisomers, the linear and the branched product. We present a new titanium catalyst with 2,6‐bis(phenylamino)pyridinato ligands for intermolecular hydroaminoalkylation reactions of styrenes and 1‐phenyl‐1,3‐butadienes that delivers the
Direct, Catalytic α-Alkylation of <i>N</i>-Heterocycles by Hydroaminoalkylation: Substrate Effects for Regiodivergent Product Formation
作者:Rebecca C. DiPucchio、Karst E. Lenzen、Pargol Daneshmand、Maria B. Ezhova、Laurel L. Schafer
DOI:10.1021/jacs.1c05498
日期:2021.7.28
reaction product, including examples of products that are generated with excellent diastereoselectivity. Alkene electronic properties can be exploited for substrate-modified regioselectivity to access the alternative linear amine alkylation product with a group 5 catalyst. This method allows for the facile isolation of unprotected N-heterocyclic products, as useful substrates for further reactivity.
Ureate Titanium Catalysts for Hydroaminoalkylation: Using Ligand Design to Increase Reactivity and Utility
作者:Manfred Manßen、Danfeng Deng、Cameron H. M. Zheng、Rebecca C. DiPucchio、Dafa Chen、Laurel L. Schafer
DOI:10.1021/acscatal.1c00014
日期:2021.4.16
earth-abundant and cost-efficient titanium catalyst generated in situ using commercially available Ti(NMe2)4 and a simple to synthesize urea proligand. This system demonstrates high TOFs for hydroaminoalkylation with unactivated substrates and features easy to use commercially available titanium amido precursors. Additionally, a high catalytic activity, scope of reactivity, and regioselectivity are all demonstrated