通过C 2对称螺双环二烯与HB(C 6 F 5)2和HB(p C 6 F 4 H)2的硼氢化反应制备了一系列新的螺双环双硼烷催化剂。当用于喹啉加氢时,这些催化剂具有出色的收率和对映体过量,并且显示出高达460的周转率。这些无金属加氢反应的最吸引人的特点是宽泛的官能团耐受性,使该方法可与现有方法互补喹啉加氢的方法。
Direct alkenylation of alkylazaarenes with aldehydes through C(sp3)–H functionalization under catalytic InCl3 activation
作者:Zaini Jamal、Yong-Chua Teo、Gina Shiyun Lim
DOI:10.1016/j.tet.2016.03.004
日期:2016.4
Under the influence of InCl3 as a Lewis acid catalyst, a methodology on the C(sp3)–H functionalization of alkylazaarenes has been demonstrated through the activation of benzylic C–H bonds towards their addition reaction with the appropriate electrophiles. This methodology was chiefly applied in the direct alkenylation of primary and secondarybenzylic C–H bonds of alkylazaarenes with aldehydes. A variety
Iron-catalyzed C(sp<sup>3</sup>)–H functionalization of methyl azaarenes: a green approach to azaarene-substituted α- or β-hydroxy carboxylic derivatives and 2-alkenylazaarenes
作者:Danwei Pi、Kun Jiang、Haifeng Zhou、Yuebo Sui、Yasuhiro Uozumi、Kun Zou
DOI:10.1039/c4ra10939b
日期:——
An iron-catalyzed C(sp3)–H functionalization of methyl azaarenes with carbonyls to access the title compounds have been described.
Nickel-catalysed direct α-olefination of alkyl substituted N-heteroarenes with alcohols
作者:Jagadish Das、Mari Vellakkaran、Debasis Banerjee
DOI:10.1039/c9cc03591e
日期:——
dehydrogenative coupling is presented. A simple nickel catalyst system stabilised by readily available nitrogen ligands enables a series of interesting E-configured vinylarenes (confirmed by X-ray crystal-structureanalysis) to be synthesised in good to excellent yields with olefin/alkane selectivity of >20 : 1. Hydrogen and water are generated as byproducts and quantitative determination of H2 was performed
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.
α-olefination of methyl-substituted N-heteroarenes with primary alcohols. The catalytic dehydrogenative coupling enables a series of functionalized E-olefinated N-heteroaromatics with excellent selectivity (>99%). Initial mechanistic studies including deuterium-labeling experiments provide evidence for the participation of the benzylic C-H/D bond of alcohols.