Iron catalyzed oxidative assembly of N-heteroaryl and aryl metal reagents using oxygen as an oxidant
作者:Kun Ming Liu、Lian Yan Liao、Xin Fang Duan
DOI:10.1039/c4cc08494b
日期:——
An equivalent amount of N-heteroaryl and aryl Grignard or lithium reagents, after mediation by an equivalent of titanate, was facilely coupled to furnish N-heteroaryl-aryl compounds under the catalysis of FeCl3/TMEDA at ambient temperature usingoxygen as an oxidant. Most of the common N-heteroaryls were all good candidates, and thus provided a general, green and pratical protocol for the flexible
Iron-Catalyzed Cross-Coupling of <i>N</i>-Heterocyclic Chlorides and Bromides with Arylmagnesium Reagents
作者:Olesya M. Kuzmina、Andreas K. Steib、Dietmar Flubacher、Paul Knochel
DOI:10.1021/ol302136c
日期:2012.9.21
A simple, practical iron salt catalyzed procedure allows fast cross-couplings of N-heterocyclic chlorides and bromides with various electron-rich and -poor arylmagnesium reagents. A solvent mixture of THF and tBuOMe is found to be essential for achieving high yields mainly by avoiding homocoupling side reactions.
Asymmetric hydrogenation: The title reaction provides an efficient and rapid access to chiral 1‐ and 3‐substituted 1,2,3,4‐tetrahydroisoquinolines with excellent enantioselectivity (see scheme; L=ligand). A preliminary mechanistic study indicates that the 1,2‐hydride addition might be the initial step in the reaction. The method has been used in the synthesis of urinary antispasmodic drug (+)‐solifenacin
不对称氢化:标题反应可高效且快速地获得手性1和3-取代的1,2,3,4-四氢异喹啉,且具有出色的对映选择性(参见方案; L =配体)。初步的机理研究表明,添加1,2-氢化物可能是反应的第一步。该方法已用于尿解痉药(+)-索非那新的合成。
Ni-Catalyzed C–H Cyanation of (Hetero)arenes with 2-Cyanoisothiazolidine 1,1-Dioxide as a Cyanation Reagent
A nickel-catalyzed C–H cyanation reaction of arenes has been developed using 2-cyanoisothiazolidine 1,1-dioxide as an electrophilic cyanation reagent. Many different directing groups can be used in this cyanation to obtain a series of cyanation products with good yields. Adopting this strategy to introduce a cyano group, natural alkaloid menisporphine was successfully synthesized through cyano group
Rhodium-Catalyzed Decarbonylative Direct Olefination of Arenes with Vinyl Carboxylic Acids
作者:Ruiying Qiu、Lingjuan Zhang、Conghui Xu、Yixiao Pan、Hongze Pang、Lijin Xu、Huanrong Li
DOI:10.1002/adsc.201401020
日期:2015.4.13
A rhodium(I)‐catalyzed direct CH bond olefination of pyridyl‐substituted arenes with readily available vinyl carboxylic acids has been realized. This reaction occurred efficiently without the need for any external oxidant, affording the ortho‐olefinated products in high yields and excellent regioselectivities. Diversely substituted vinyl carboxylic acids behaved as efficient olefination reagents under