Palladium-Catalyzed Aminomethylamination and Aromatization of Aminoalkenes with Aminals via C–N Bond Activation
作者:Lixin Li、Peipei Liu、Yijin Su、Hanmin Huang
DOI:10.1021/acs.orglett.6b03001
日期:2016.11.4
the Pd-catalyzed tandem aminomethylamination/aromatization reaction with aminals via C–N bond activation. This direct and operationally simple protocol provides a fundamentally novel strategy to synthesize aromatic heterocycles from alkenes in the absence of external oxidant and base. Mechanistic studies suggested that aminal not only functioned as an aminomethyl source but also acted as formal oxidant
Photocatalytic Generation of N-Centered Hydrazonyl Radicals: A Strategy for Hydroamination of β,γ-Unsaturated Hydrazones
作者:Xiao-Qiang Hu、Jia-Rong Chen、Qiang Wei、Feng-Lei Liu、Qiao-Hui Deng、André M. Beauchemin、Wen-Jing Xiao
DOI:10.1002/anie.201406491
日期:2014.11.3
photocatalytic generation of N‐centered hydrazonyl radicals has been accomplished for the first time. This approach allows efficient intramolecular addition of hydrazonyl radical to terminal alkenes, thus providing hydroamination and oxyamination products in good yields. Importantly, the protocol involves deprotonation of an NH bond and photocatalytic oxidation to an N‐centered radical, thus obviating
A mild and highly efficient Cu‐catalyzed cascade cyclization/thiocyanation of unactivated alkenes bearing hydrazones has been developed. A broad range of SCN‐substituted pyrazolines have been readily obtained in good to excellent yields with commercially available and very cheap Cu(acac)2 and NH4SCN. This present method provides a rapid, facile, and practical access to valuable pyrazolines with the
palladium-catalyzed aminoarylation reaction of the unactivated alkenes in β,γ-unsaturatedhydrazones is described. This protocol enables efficient and simultaneous formation of C(sp3)–N and C(sp3)–C(sp2) bonds under mild conditions, providing a practical and general approach to various diversely substituted dihydropyrazoles in generally good yields, without the use of any stoichiometric external oxidant