Fe-Catalyzed Acceptorless Dehydrogenation of Secondary Benzylic Alcohols
作者:Hansoo Song、Byungjoon Kang、Soon Hyeok Hong
DOI:10.1021/cs5007316
日期:2014.9.5
Oxidation of alcohols is an essential organic reaction, affording versatile carbonyl groups. To provide a sustainable solution for environmentally harmful traditional oxidation methods, the transition-metal catalyzed acceptor-free dehydrogenation of alcohols has attracted much attention. The widely used catalysts for the dehydrogenation reaction are based on precious metals, which are not economical
醇的氧化是必不可少的有机反应,可提供多种羰基。为了提供对环境有害的传统氧化方法的可持续解决方案,醇的过渡金属催化的无受体脱氢倍受关注。用于脱氢反应的广泛使用的催化剂基于贵金属,这不经济且对环境无害。我们开发了一种操作简单,经济,环境友好的无Fe催化的各种仲苄醇脱氢反应,以提供相应的酮和H 2。一种现成的乙酰丙酮铁(III),1,10-菲咯啉和K 2 CO 3的简单原位混合物 被确定为该转化的活性催化剂。
NHC–copper hydrides as chemoselective reducing agents: catalytic reduction of alkynes, alkyl triflates, and alkyl halides
作者:Nick Cox、Hester Dang、Aaron M. Whittaker、Gojko Lalic
DOI:10.1016/j.tet.2014.04.004
日期:2014.7
as well as the NHC–copper-catalyzed reduction of primary alkyl triflates and primary and secondary alkyl iodides and bromides are described. The high chemoselectivity demonstrated in these examples illustrates the mild nature of copper hydride complexes as reducing agents, which have applications in synthetic chemistry beyond their traditional role in the reduction of activated alkenes and carbonyl compounds
Atom-Transfer Radical Addition to Unactivated Alkenes by using Heterogeneous Visible-Light Photocatalysis
作者:Liang-Liang Mao、Huan Cong
DOI:10.1002/cssc.201701382
日期:2017.11.23
photocatalyst titanium dioxide in the presence of a catalytic hypervalent iodine(III) reagent has been found as an effective method to initiate a broad range of atom-transfer radicaladdition reactions to unactivated alkenes under mild and heavy metal-free conditions.
Monophasic Catalytic System for the Selective Semireduction of Alkynes
作者:Aaron M Whittaker、Gojko Lalic
DOI:10.1021/ol4001679
日期:2013.3.1
A highly efficient semireduction of alkynes has been developed. Using 0.5–2 mol % of a copper catalyst, semireduction can be accomplished with a wide range of substrates, including both internal and terminal alkynes without over-reduction. The new method has excellent chemoselectivity, and the semireduction can be accomplished even in the presence of nitro and aryl iodo groups. Finally, commercial