Visible Light‐Induced Decarboxylative Alkylation of Heterocyclic Aromatics with Carboxylic Acids via Anthocyanin as a Photocatalyst
作者:Rui Guo、Minghui Zuo、Qinye Tian、Chuanfu Hou、Shouneng Sun、Weihao Guo、Hongfeng Wu、Wenyi Chu、Zhizhong Sun
DOI:10.1002/asia.202000277
日期:2020.7
A visiblelight‐induced decarboxylative alkylation of heterocyclic aromatics with aliphatic carboxylicacids was developed by using anthocyanins as a photocatalyst under mild conditions. A series of alkylated heterocyclic compounds were obtained in moderate to good yields by using the metal‐free decarboxylative coupling reaction under blue light. This strategy uses cheap and readily available carboxylic
Visible-light-promoted photocatalyst-free alkylation and acylation of benzothiazoles
作者:Pengxing Jiang、Li Liu、Jiajing Tan、Hongguang Du
DOI:10.1039/d1ob00734c
日期:——
Herein we report a protocol for the visible-light-mediated alkylation/acylation reaction of benzothiazoles. Alkyl/acyl substituted Hantzschesters are easily prepared and rationally used as radical precursors. In the presence of BF3·Et2O and Na2S2O8, various benzothiazole derivatives were readily obtained in good yields. Our user-friendly protocol can proceed by simple irradiation with blue LEDs (λ
在此,我们报告了苯并噻唑的可见光介导的烷基化/酰化反应的方案。烷基/酰基取代的Hantzsch酯易于制备,可以合理地用作自由基前体。在BF 3 ·Et 2 O和Na 2 S 2 O 8的存在下,容易以高收率获得各种苯并噻唑衍生物。我们的用户友好协议可以通过简单地用蓝色LED(λ = 465 nm)进行辐照来进行,而无需外部光催化剂的帮助。该反应的特征还在于温和的条件和可扩展性,因此为合成2-官能化的苯并噻唑提供了另一种有效的工具。
Silver catalyzed decarboxylative direct C2-alkylation of benzothiazoles with carboxylic acids
A novel and efficient silver catalyzed decarboxylative direct C2-alkylation of benzothiazoles with carboxylic acids for the synthesis of 2-alkyl benzothiazoles was developed.
Solvent‐Free Synthesis of 2‐Aryl and 2‐Alkylbenzothiazoles on Silica Gel Under Microwave Irradiation
作者:Mitsuo Kodomari、Yoshimi Tamaru、Tadashi Aoyama
DOI:10.1081/scc-200026663
日期:2004.1.1
Abstract 2‐Substituted benzothiazoles have been synthesized by the condensation of o‐aminothiophenol and aromatic or aliphatic aldehydes in the presence of silicagelundermicrowaveirradiation (MW) and solvent‐free conditions. The silicagel can be easily recovered and reused for subsequent reactions without loss of the activity.
The invention provides a series of -αketoheterocyclic compounds, for example, compounds of formula (I). The compounds can inhibit fatty acid amide hydrolase and can be useful for treatment of malconditions modulated by fatty acid amide hydrolase. The invention further provides methods of making compounds of formula (I), useful intermediates for the preparation of compounds of formula (I), and methods of using compounds of formula (I) and compositions thereof.