Indium-Catalyzed Construction of Polycyclic Aromatic Hydrocarbon Skeletons via Dehydration
摘要:
Polycyclic aromatic compounds can be synthesized from 2-benzylic- or 2-allylbenzaldehydes using a catalytic amount of In(III) or Re(I) complexes. By using this method, polycyclic aza-aromatic compounds can also be prepared efficiently. In these reactions, only water is formed as a side product.
Direct synthesis of anthracenes from o-tolualdehydes and aryl iodides through Pd(II)-Catalyzed sp C H arylation and electrophilic aromatic cyclization
作者:Hyojin Park、Kwangho Yoo、Byunghyuck Jung、Min Kim
DOI:10.1016/j.tet.2018.03.006
日期:2018.4
The first direct synthesis of substituted anthracenes from o-tolualdehydes and aryl iodides via a Pd(II)-catalyzed CH arylation using an alcohol-bearing transient directing group and subsequent AgOTf-assisted electrophilic aromatic cyclization is described. New transient directing groups consisting of amino acids and amino alcohols enhanced the reactivity, and the CH arylation was complete in 12 h
Glycinamide hydrochloride as a transient directing group: Synthesis of 2-benzylbenzaldehydes by C(sp<sup>3</sup>)−H arylation
作者:Fei Wen、Zheng Li
DOI:10.1080/00397911.2020.1802759
日期:2020.11.16
Abstract Glycinamide hydrochloride as an inexpensive and commercially available transientdirectinggroup for the C(sp3)−Harylation of 2-methylbenzaldehydes is described. A series of practical 2-benzylbenzaldehydes bearing various functional groups are efficiently synthesized in satisfactory yield by this strategy. This method can also be extended to gram scale. Graphical Abstract
PROCESS FOR CREATING CARBON-CARBON BONDS USING CARBONYL COMPOUNDS
申请人:CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (C.N. R.S.)
公开号:US20150166464A1
公开(公告)日:2015-06-18
The present invention concerns a process for preparing a compound of formula (I) by reaction between a compound of formula (II) and a compound of formula (III) in the presence of a copper-containing catalyst, a ligand and base. The invention also concerns the implementing of this process for the preparation of building blocks to prepare molecules of interest in particular in the pharmaceutical, agro-chemical fields, etc.
can act as temporary directing groups in the Pd-catalyzed coupling of arenes with aldehydes or ketones. By reversibly binding to these latter substrates just long enough for the Pd catalysis to ensue, the amino acids eliminate the need for more laborious directing group manipulations. Science, this issue p. 252 Amino acids can reversibly complex with aldehydes and ketones to direct palladium-catalyzed
Acetohydrazone: A Transient Directing Group for Arylation of Unactivated C(sp<sup>3</sup>)–H Bonds
作者:Fei Ma、Min Lei、Lihong Hu
DOI:10.1021/acs.orglett.6b01170
日期:2016.6.3
A straightforward and efficient method has been developed for the synthesis of 2-benzylbenzaldehyde derivatives from 2-methylbenzaldehyde and iodobenzene via a C(sp3)–H activation process. In the course of the activation reaction, acetohydrazone is formed between 2-benzylbenzaldehyde and acetohydrazine as a transient directing group. As a new kind of transient directing group, acetohydrazone exhibits