The tunable synthesis of benzothiazole functionalized vicinal diketones and 2-aroylbenzothiazoles has been realized by tailoring the enaminone CC double bond.
苯并噻唑官能化邻二酮和2-芳酰基苯并噻唑的可调合成已通过调整烯胺酮的C=C双键实现。
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。
Direct Preparation of 2-Benzothiazolylzinc Bromide and its Applications: A Facile Synthetic Route to the Preparation of 2-Substituted Benzothiazole Derivatives
作者:Soo-Youl Park、Kyuhyuk Lee、Seung-Hoi Kim
DOI:10.5012/bkcs.2014.35.6.1848
日期:2014.6.20
methods A and C are relatively undeveloped. Interestingly, there is no report of synthesis utilizing method A, likely owing to the difficulty of preparing the corresponding organometallic reagents. In our continuing study on the application of organozinc reagents, we found that stable 2benzothiazolylzinc bromide (I) was easily prepared by the direct insertion of highly active zinc into 2-bromobenzothiazole
苯并噻唑部分已在多种天然产物和药物中发现,并显示出有效的生物活性。具体而言,2-取代的苯并噻唑衍生物由于其独特的结构性质在广泛的化学应用中引起了相当大的关注。因此,过去几十年来,合成方案的多样性一直是参与有机合成的科学家们广泛讨论的话题。一般来说,为了构建 2-取代的苯并噻唑配合物,策略工具可以分类为方案 1 所示:苯并噻唑基金属配合物的交叉偶联(方法 A),苯并噻唑通过直接氧化 CH 活化的偶联反应(方法 B),有机金属与卤代苯并噻唑的交叉偶联(方法 C),和含有N和S的化合物与适当的底物的环结构(方法D)。在这些工具中,方法 B 和 D 已被广泛探索。相比之下,尽管含过渡金属的有机金属配合物的有效性和效率,方法 A 和 C 相对不发达。有趣的是,没有使用方法A合成的报道,可能是由于难以制备相应的有机金属试剂。在我们对有机锌试剂应用的持续研究中,我们发现通过将高活性锌直接插入 2-溴苯并噻唑中很容易制备稳定的
Regioselectivity in the Addition of Vinylmagnesium Bromide to Heteroarylic Ketones: <i>C</i>- versus <i>O</i>-Alkylation
作者:Carla Boga、Rayk Stengel、Rodolphe Abdayem、Erminia Del Vecchio、Luciano Forlani、Paolo E. Todesco
DOI:10.1021/jo048948p
日期:2004.12.1
observed as unique with di(1,3-benzothiazol-2-yl) ketone, and in different relative ratios with respect to the classic C-alkylation product with di(1,3-thiazol-2-yl) ketone, (1,3-benzothiazol-2-yl) (1,3-thiazol-2-yl) ketone, and di(1,3-benzoxazol-2-yl) ketone, whereas di(N-methylbenzimidazol-2-yl) ketone gave the exclusive formation of the carbinol. This behavior can be explained by the intervention
Selective C(sp<sup>2</sup>)–H bond functionalization of olefins <i>via</i> visible-light-induced photoredox-quinuclidine dual catalysis
作者:Xin-Tao Gu、Long-Hai Li、Yin Wei、Min Shi
DOI:10.1039/d2cc03694k
日期:——
The siteselective C(sp2)–H bond functionalization of olefins has been achieved through a visible-light-induced photoredox-quinuclidine dualcatalysis upon merging the quinuclidinium radical cation addition to alkene strategy and the distal heteroaryl ipso-migration strategy. This synthetic protocol features a simple operation with readily available starting materials in good step-economy to access