An unprecedented olefination reaction of secondaryamines with carbon nucleophiles has been developed through C–N/C–H functionalization under metal-free oxidative conditions. In the presence of a stoichiometric amount of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), a range of secondary N-alkylanilines smoothly underwent oxidative olefination with 2-alkylazaarenes, acetophenone, and malononitrile
Metal-free oxidative olefination of primary amines with benzylic C–H bonds through direct deamination and C–H bond activation
作者:Liang Gong、Li-Juan Xing、Tong Xu、Xue-Ping Zhu、Wen Zhou、Ning Kang、Bin Wang
DOI:10.1039/c4ob01025f
日期:——
An oxidative olefination reaction between aliphatic primary amines and benzylic sp3 C–H bonds has been achieved using N-bromosuccinimide as catalyst and tert-butyl hydroperoxide as oxidant. The olefination proceeds under mild metal-free conditions through direct deamination and benzylic C–Hbond activation, and provides easy access to biologically active 2-styrylquinolines with (E)-configuration.
NH<sub>4</sub>I-mediated sp<sup>3</sup> C-H cross-dehydrogenative coupling of benzylamines with 2-methylquinoline for the synthesis of <i>E</i>-2-styrylquinolines
any metal catalyst, a simple and efficient method for the synthesis of E-2-styrylquinolines through sp3 C-Hcross-dehydrogenativecoupling of benzylamines with 2-methylquinolines mediated by NH4I under air is successfully developed. The oxidative olefination proceeded through deamination and sp3 C–H bond activation. A plausible mechanism is proposed for the construction of E-2-styrylquinolines.
aldehydes has been achieved through a novel synergistic organocatalysis. The HOAc‐ activated 2‐methylquiolines undergo a Michael addition to 1,3‐dimethylbarbituricacid‐activated aldehydes, followed by a retro‐Michael addition to release 1,3‐dimethylbarbituricacid and the target products. The transformation produced various 2‐alkenylquinolines with good to excellent yields and featured mild reaction conditions
Cobalt-Catalyzed Direct Alkenylation of 2-Methylquinolines with Aldehydes via C(sp3)–H Functionalization in Water
作者:Yong-Chua Teo、Zaini Jamal
DOI:10.1055/s-0034-1378355
日期:——
The direct C(sp(3))-H alkenylation of 2-methylquinolines with aldehydes as a simple methodology to afford 2-alkenylated quinolines is reported. In the presence of catalytic CoCl2 in water, the economically and ecologically sound transformation is proposed to proceed via the direct benzylic addition to the aldehyde followed by an elimination step to provide 2-alkenylated quinolines in good to excellent yield of up to 95%.