A novel iridium/acid co-catalyzed transfer hydrogenative C(sp<sup>3</sup>)–H bond alkylation to access functionalized N-heteroaromatics
作者:Zhenda Tan、Huanfeng Jiang、Min Zhang
DOI:10.1039/c6cc03996k
日期:——
A novel iridium/acid co-catalysed transfer hydrogenative coupling strategy, enabling direct alkylation of C(sp3)-H bond and atom-economic access to alkyl chain-lengthened N-Heteroaromatics from six-membered 2-alkyl cyclicamines and aldehydes, has been...
Alkylation of 2-methylquinoline with alcohols under additive-free conditions by Al2O3-supported Pt catalyst
作者:Chandan Chaudhari、S.M.A. Hakim Siddiki、Ken-ichi Shimizu
DOI:10.1016/j.tetlet.2013.09.077
日期:2013.11
Supported metal nanoparticle catalysts are studied for alkylation of 2-methylquinoline with benzyl alcohol under additive-free conditions in N2 atmosphere. Among various metal-loaded Al2O3 catalysts and supported Ptcatalysts, Pt metal nanocluster loaded-Al2O3 pre-reduced in H2 at 500 °C shows highest yield (82%) of the product (2-phenethyl-quinoline). The catalyst is reusable, shows higher turnover number
研究了负载型金属纳米颗粒催化剂在N 2气氛下在无添加剂条件下用苄醇对2-甲基喹啉进行烷基化的过程。在各种负载金属的Al 2 O 3催化剂和负载型Pt催化剂中,负载有H 2的Pt金属纳米簇负载的Al 2 O 3预还原在500°C时显示出最高收率(82%)的产品(2-苯乙基喹啉)。该催化剂是可重复使用的,比以前的均相催化剂具有更高的周转率,并且对于2-甲基喹啉与各种醇的烷基化显示出良好至中等的产率。该反应由借位氢途径驱动,其中由醇脱氢形成的醛与2-甲基喹啉进行醛醇缩合,得到烯烃中间体,该中间体最终被Pt-H物质氢化。
Iridium-Catalyzed Alkylation of Methylquinolines with Alcohols
作者:Yasushi Obora、Shinji Ogawa、Nobuyuki Yamamoto
DOI:10.1021/jo3019347
日期:2012.10.19
Iridium-catalyzed alkylation of methylquinolines at the methyl substituent was achieved using alcohols as alkylating agents. The reaction proceeded through a transfer hydrogenation pathway from the alcohol to the Ir complex, affording an aldehyde and Ir-H species, followed by base assisted aldol condensation and hydrogenation. This method provides an atom-economical and convenient route to alkylquinolines from easily accessible methylquinolines.
Ligand-Free RuCl<sub>3</sub>-Catalyzed Alkylation of Methylazaarenes with Alcohols
作者:Tong-Yu Feng、Hong-Xi Li、David James Young、Jian-Ping Lang
DOI:10.1021/acs.joc.6b03095
日期:2017.4.21
RuCl3 efficiently catalyzes the alkylation of methylquinolines, methylpyridines, 2-methyl-benzooxazoles, and 2-methyl-quinoxalines with alkyl- or aryl-alcohols as alkylating agents. This synthetically useful and atom economical transformation does not require additional ligands. The mechanistic study indicated the alkylation reaction underwent a stepwise transfer hydrogenation, aldol condensation,