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
azaheterocycle N-oxides with alkenes catalyzed by iodine under metal- and external oxidant-free reaction conditions has been developed. A variety of (E)-2-styrylazaheterocycles have been produced in moderate to excellent yields. The mechanistic exploration indicated that the N-oxide group played dual roles as both the directing group and an internal oxidant in this catalytic cycle.
Metal‐Free Synthesis of Alkenylazaarenes and 2‐Aminoquinolines through Base‐Mediated Aerobic Oxidative Dehydrogenation of Benzyl Alcohols
作者:Dipak J. Dahatonde、Aritra Ghosh、Sanjay Batra
DOI:10.1002/ejoc.202100420
日期:2021.5.20
A metal‐free, base‐mediated oxidative dehydrogenative coupling of substituted phenylmethanols (benzyl alcohols) with methyl azaarenes or phenylacetonitriles to afford substituted alkenylazaarenes or 2‐aminoquinolines, respectively is presented.
Tandem Acceptorless Dehydrogenative Coupling–Decyanation under Nickel Catalysis
作者:Siba P. Midya、Murugan Subaramanian、Reshma Babu、Vinita Yadav、Ekambaram Balaraman
DOI:10.1021/acs.joc.1c00592
日期:2021.6.4
reported. This unprecedented C═Cbond-forming methodology takes place in a tandem manner with the formation of formamide as a sole byproduct. The significant advantages of this strategy are the low-cost nickel catalyst, good functional group compatibility (ether, thioether, halo, cyano, ester, amino, N/O/S heterocycles; 43 examples), synthetic convenience, and high reaction selectivity and efficiency
Lewis-Acid-Catalyzed Benzylic Reactions of 2-Methylazaarenes with Aldehydes
作者:Dan Mao、Gang Hong、Shengying Wu、Xin Liu、Jianjun Yu、Limin Wang
DOI:10.1002/ejoc.201400073
日期:2014.5
Lewis-acid-catalyzedbenzylicreactions of 2-methylazaarenes with aldehydes have been investigated. Series of azaarene derivatives were afforded by this reaction. 2-(Pyridin-2-yl)ethanols with common substituents were formed through the LiNTf2-promoted aldol reaction for the first time. 2-Alkenylpyridines, exclusively in the form of the E isomers, were synthesized in the presence of LiNTf2 cooperated
已经研究了路易斯酸催化的 2-甲基氮杂芳烃与醛的苄基反应。该反应得到一系列氮杂芳烃衍生物。首次通过LiNTf2促进的羟醛反应形成了具有常见取代基的2-(Pyridin-2-yl)乙醇。在 LiNTf2 与 H2NTf 协同作用下,合成了仅以 E 异构体形式存在的 2-烯基吡啶。在La(Pfb)3催化下,2-甲基喹啉与醛类在空气中反应,以高收率得到2-烯基喹啉。