一系列5,6-二取代的苯并[ b ]噻吩已被合成用于生物学评估。这些包括类色胺,褪黑激素和harmaline类型的类似物,在5位和6位均具有羟基,甲氧基,甲氧基甲氧基或异丙二烯二氧基。为了合成这些,制备适当的巯基愈创木酚,并与氯乙酰乙酸酯缩合为4-芳基硫代乙酰乙酸酯。当游离酚基被甲氧基甲基掩盖时,这些酮的环化效果最佳。然后将苯并[ b ]噻吩基乙酸酯转化为相应的酰胺,还原为色胺类似物,乙酰化为褪黑激素类似物,并环化为harmaline类似物。ñ还合成了乙酰色胺和1-甲基褪黑激素以进行比较。报告了褪黑激素类似物的初步生物测定结果,该结果显示了活性。
Direct Photocatalytic S–H Bond Cyanation with Green “CN” Source
作者:Wei Guo、Wen Tan、Mingming Zhao、Lvyin Zheng、Kailiang Tao、Deliang Chen、Xiaolin Fan
DOI:10.1021/acs.joc.8b00887
日期:2018.6.15
Herein we report a novel C–S bond cleavage and reconstruction strategy for the synthesis of thiocyanates through direct photocatalytic S–Hbond cyanation from thiols and inorganic thiocyanate salts. In our strategy, the unprecedented example of cutting off C–S bond of SCN– to deliver the green “CN” sources is demonstrated. This transformation features nontoxic and inexpensive “CN” sources, available
5‐(Cyano)dibenzothiophenium Triflate: A Sulfur‐Based Reagent for Electrophilic Cyanation and Cyanocyclizations
作者:Xiangdong Li、Christopher Golz、Manuel Alcarazo
DOI:10.1002/anie.201904557
日期:2019.7.8
and its reactivity as electrophilic cyanation reagent evaluated. The scalable preparation, easy handling and broad substrate scope of the electrophilic cyanation promoted by 9, which includes amines, thiols, silyl enol ethers, alkenes, electron rich (hetero)arenes and polyaromatic hydrocarbons, illustrate the synthetic potential of this reagent. Importantly, Lewis acid activation of the reagent is not
1-Cyanoimidazole as a Mild and Efficient Electrophilic Cyanating Agent
作者:Yong-qian Wu、David C. Limburg、Douglas E. Wilkinson、Gregory S. Hamilton
DOI:10.1021/ol0055263
日期:2000.3.1
A mild and high-yielding cyanating reaction of amine, sulfur, and carbanion nucleophiles is reported here using 1-cyanoimidazole as an electrophilic cyanating agent.
Efficient and Mild Oxidative Nuclear Thiocyanation of Activated Aromatic Compounds Using Ammonium Thiocyanate and Diacetoxyiodobenzene
作者:N. N. Karade、G. B. Tiwari、S. G. Shirodkar、B. M. Dhoot
DOI:10.1081/scc-200054770
日期:2005.5
Abstract A mild and general method for the nuclear thiocyanation of electron rich arenes has been developed by the reaction of NH4SCN with diacetoxyiodobenzene as the oxidant.