p-Iodinations in hydrocarbon media: continuous flow reactor application
摘要:
Regiospecific iodination of aryl amines, that is, aryl compounds possessing strong electron donating groups (EDG's) in the p-position, is described. This procedure features not only unique use of hydrocarbon media for such substitutions but also the absence of any oxidants aside from iodine itself. Further potential of this hydrocarbon media based electrophilic aromatic substitution is demonstrated by the coupling of the iodination with an in situ halogen/lithium exchange and product forming nucleophilic addition in a batch process. The protocol was ultimately scaled to a continuous flow reactor using an isolated p-iodo-arylamine. Constituted as described, these procedures possess enhanced atom-economical, green and safety aspects compared to existing literature protocols. (C) 2011 Elsevier Ltd. All rights reserved.
Unexpected <i>ortho</i>-Heck Reaction under the Catellani Conditions
作者:Alexander J. Rago、Guangbin Dong
DOI:10.1021/acs.orglett.0c00952
日期:2020.5.15
An unexpected ortho-Heck reaction has been discovered during the study of palladium/norbornene (Pd/NBE) catalysis. Under the Catellani reaction conditions in the presence of lithium salts and olefins, Heck coupling takes place at the ortho position instead of the commonly observed ipso position; meanwhile, a norbornyl group is introduced at the arene ipso position. Systematic deuterium labeling and
Photoredox‐Catalyzed Tandem Demethylation of
<i>N</i>
,
<i>N</i>
‐Dimethyl Anilines Followed by Amidation with α‐Keto or Alkynyl Carboxylic Acids
作者:Pritha Das、Hasina Mamataj Begam、Samir Kumar Bhunia、Ranjan Jana
DOI:10.1002/adsc.201900525
日期:2019.9.3
for highly selective monodemethylation of N,N‐dimethyl anilines to generate secondary amines and subsequent coupling with α‐ketocarboxylic acids or alkynyl carboxylic acids to form α‐ketoamides or alkynamides respectively undervisiblelight photoredox catalyst in a single operation. From the deuterium‐labeling experiment, it was probed that demethylation is the slowest step in this tandem process
[EN] COMPOUNDS AND COMPOSITIONS AS TLR ACTIVITY MODULATORS<br/>[FR] COMPOSÉS ET COMPOSITIONS SERVANT DE MODULATEURS DE L'ACTIVITÉ DES TLR
申请人:IRM LLC
公开号:WO2009111337A1
公开(公告)日:2009-09-11
The invention provides a novel class of compounds, pharmaceutical compositions comprising such compounds and methods of using such compounds to treat or prevent diseases or disorders associated with Toll-Like Receptors, including TLR7 and TLR8. In one aspect, the compounds are useful as adjuvants for enhancing the effectiveness of a vaccine (formula I) wherein: X3 is N; X4 is N Or CR3; X5 is -CR4=CR5.
Joint palladium/norbornene organometallic catalysis allows for straightforward access to dibenzo[c,e]azepines. These synthetically challenging polycyclic frameworks form in one pot via a three-component coupling of an aryl iodide, a bromobenzylamine, and an olefin. A key, atroposelective aryl–aryl coupling from chelated Pd(IV) intermediates dictates the outcome of the cascade. DFT modeling sheds light
To show the synthetic utility of palladium/norbornene (Pd/NBE) cooperativecatalysis, here we report concise syntheses of indenone-based natural products, pauciflorol F and acredinone A, which are enabled by direct annulation between aryl iodides and unsaturated carboxylic acid anhydrides. Compared to the previous indenone-preparation approaches, this method allows simple aryl iodides to be used as
为了展示钯/降冰片烯 (Pd/NBE) 协同催化的合成效用,我们在此报道了基于茚酮的天然产物、少花酚 F 和 acredinone A 的简明合成,这些产物是通过芳基碘化物和不饱和羧酸酐之间的直接成环来实现的。与以前的茚酮制备方法相比,该方法允许使用简单的芳基碘化物作为底物,并完全控制区域选择性。acredinone A 的全合成以两种不同的 Pd/NBE 催化的邻位酰化反应为特征,用于构建五取代的芳烃核心,包括开发新的邻位酰化/原硼酸化。