Synthesis of Benzo[b]naphtho[2,3-d]thiophene-6,11-diones via Palladium(II) Acetate-mediated Cyclization of 3-Arylthio-1,4-naphthoquinone
摘要:
Palladium(II)-mediated oxidative cyclization of 3-arylthio1,4-naphthoquinone (4) giving biologically important benzo[b]naphtho[2,3-d]thiophene-6,11-diones (2) has been performed with a stoichiometric amount of palladium(II) acetate in distillated acetic acid.
Silver-Catalyzed Direct Thiolation of Quinones by Activation of Aryl Disulfides to Synthesize Quinonyl Aryl Thioethers
摘要:
A silver-catalyzed coupling reaction of quinones with aryl disulfides for the synthesis of quinonyl aryl thio ethers is described. In the presence of AgOAc (0.2 equiv)/dppp (0.24 equiv) as the catalyst, (NH4)(2)S2O8 (3.0 equiv) as the oxidant, and Bu4NBF4 (1.0 equiv) as the additive, the reaction is simple, provides high yield (up to 88% yield), and possesses a broad substrate scope. The reaction is believed to proceed via direct activation of disulfides evidenced by observation of a metathesis reaction between two different disulfides placed together under the reaction conditions and C-13 NMR spectroscopy analysis.
BiCl<sub>3</sub> catalyzed synthesis of 2-amino-1,4-naphthoquinones and 1,4-naphthoquinon-2-sulfides and one-pot sequential amine-arylation of 1,4-naphthoquinone
作者:Mayurakhi Bhuyan、Gakul Baishya
DOI:10.1039/d2ob01792j
日期:——
Using the Lewis acid catalyst BiCl3, a new method for the synthesis of 2-amino-1,4-naphthoquinones and 1,4-naphthoquinon-2-sulfides from 1,4-naphthoquinone has been devised. This method has a broad substrate scope and product extraction is easy. It is low-cost, requires mild and sustainable reaction conditions and results in superior product yields. Additionally, this study presents the first technique
使用路易斯酸催化剂BiCl 3,设计了一种从1,4-萘醌合成2-氨基-1,4-萘醌和1,4-萘醌-2-硫化物的新方法。该方法底物适用范围广,产物提取容易。它成本低廉,需要温和且可持续的反应条件,并可提高产品收率。此外,本研究提出了第一种用胺和芳基肼/K 2 S 2 O 8进行单锅顺序胺芳基化的技术直接从 1,4-萘醌生产芳基化 2-氨基-1,4-萘醌。这种从经历自由基偶联反应的芳基肼产生芳基自由基的操作上直接的通过自由基捕获控制实验得到了很好的证明。