Design and Synthesis of 2-Acylbenzothiazoles via In Situ Cross-Trapping Strategy from Benzothiazoles with Aryl Ketones
摘要:
An I-2/KOH synergistically promoted direct ring-opening aroylation of benzothiazoles with aryl ketones has been discovered. Aryl ketones were seen to act as carbonyl sources to construct 2-acylbenzothiazoles. This reaction could provide an example for the convergent integration of self-labor domino sequences based on an in situ cross-trapping strategy.
via AlCl3-mediated cyclization reaction and I2-promoted sequential oxidation reaction of 2-aminobenzenethiols with arylacetonitriles was developed. This reaction proceeds smoothly with a wide range of arylacetonitriles containing different functional groups to give the corresponding products in moderate to good yields under mild conditions. Moreover, this reaction was conveniently conducted on a gram
开发了一种有效的一锅法,通过AlCl 3介导的环化反应和 I 2促进的 2-氨基苯硫醇与芳基乙腈的顺序氧化反应获得 2-酰基苯并噻唑。该反应与各种含有不同官能团的芳基乙腈一起顺利进行,在温和的条件下以中等至良好的收率得到相应的产物。此外,该反应方便地以克规模进行,产率仍高达68%。
I2 promoted domino oxidative cyclization for one-pot synthesis of 2-acylbenzothiazoles via metal-free sp3 C–H functionalization
An I(2) promoted domino protocol was developed to construct 2-acylbenzothiazoles from simple and readily available aromatic ketones/unsaturated methyl ketones and o-aminobenzenethiols. The reaction proceeded smoothly under metal-free and peroxide-free conditions.
A multipathway coupled domino strategy has been developed for the efficient synthesis of 2-acylbenzothiazoles from multiform substrates arylethenes, arylacetylenes, 2-hydroxy-aromatic ketones, and carbinols via four distinct pathways. Through a logical coupled oxidation/heterocyclization domino process, a variety of 2-acylbenzothiazoles were synthesized free of metal in one pot.
To discover an efficient and convenient method to synthesize C2-arylacylated benzothiazoles as potential drug scaffolds, a novel [bis(trifluoroacetoxy)iodo]benzene(PIFA)/KOH synergistically promoted direct ring-opening C2-arylacylation reaction of 2H-benzothiazoles with aryl methyl ketones has been developed. Various substrates were tolerated under optimized conditions affording the C2-arylacylation
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。