Iodine-mediated aminosulfonylation of alkenyl sulfonamides with sulfonyl hydrazides: synthesis of sulfonylmethyl piperidines, pyrrolidines and pyrazolines
作者:Zhong-Qi Xu、Wen-Bo Wang、Lin-Chuang Zheng、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1039/c9ob01847f
日期:——
aminosulfonylation of alkenyl sulfonamides was reported. Using iodine as the catalyst, TBHP as the oxidant, and sulfonyl hydrazides as the sulfonyl radical sources, a variety of sulfonylmethyl piperidines, pyrrolidines and pyrazolines were obtained in moderate to excellent yields.
Hypervalent iodine-mediated Ritter-type amidation of terminal alkenes: The synthesis of isoxazoline and pyrazoline cores
作者:Sang Won Park、Soong-Hyun Kim、Jaeyoung Song、Ga Young Park、Darong Kim、Tae-Gyu Nam、Ki Bum Hong
DOI:10.3762/bjoc.14.89
日期:——
heterocyclic cores and functional groups. In this regard, we have developed a Ritter-type alkene functionalization utilizing a PhI(OAc)2 ((diacetoxyiodo)benzene, PIDA)/Lewis acid combination in order to access isoxazoline and pyrazoline cores. Based on allyl ketone oximes and allyl ketone tosylhydrazones, we have developed an alkene oxyamidation and amido-amidation protocol en route to accessing both isoxazoline
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