p -Toluenesulfonic acid-catalyzed metal-free formal [4 + 1] heteroannulation via N H/O H/S H functionalization: One-pot access to 2-aryl/hetaryl/alkyl benzazole derivatives
concise and direct one-pot [4 + 1] synthetic strategy for the construction of 2-substituted benzazoles such as benzoxazoles and benzothiazoles has been disclosed in high yields (80–98%) by cascade coupling reaction of 2-amino(thio)phenols with β-oxodithioesters. The current approach enables NH/OH/SH functionalization in one-pot under solventless condition leading to diverse benzazoles without use of any
通过2-氨基(硫代)的级联偶联反应,已公开了一种高产率(80-98%)的简洁,直接的一锅[4 +1]合成策略,用于构建2-取代的苯并唑,如苯并恶唑和苯并噻唑酚与β-氧二硫代酯。目前的方法可以在无溶剂条件下在一锅中实现N H / O H / S H官能化,从而无需使用任何外部金属即可产生多种苯并恶唑。各种各样的2-氨基(硫代)酚和β-氧二硫代酯均具有出色的官能团耐受性,可用于该转化。此外,我们通过证明其与DNA拓扑异构酶II抑制剂的多样化多样化的相容性,抢占了这一新策略的广泛含义。
Diversity oriented catalyst-free and solvent-free one-pot MCR at room temperature: rapid and regioselective convergent approach to highly functionalized dihydro-4H-thiopyrans
Highly convergent and regioselective approach to hitherto unreported and synthetically demanding 6-cycloamino-2-(methyl/benzyl)sulfanyl-3-(aroyl/hetaroyl/alkanoyl)-4-aryl-5,6-dihydro-4H-thiopyrans has been developed via one-pot three-component domino coupling of β-oxodithioesters, α,β-unsaturated aldehydes, and cyclic aliphatic secondary amines at roomtemperature under catalyst-free and solvent-free
Efficient One-Pot Synthesis of Benzo[e]pyrazolo[1,5-c][1,3]thiazine Derivatives under Copper-Catalyzed Conditions
作者:Xiaobo Yang、Jiyang Jie、Haoyi Li、Meihui Piao
DOI:10.3987/com-16-13477
日期:——
An efficient method has been developed for the synthesis of benzo[e]pyrazolo[1,5-c][1,3]thiazines via one-pot two-step reactions of readily available substituted 1-(2-halophenyl)-3-akylprop-2-yn-1-ones, hydrazine hydrochloride and β-oxodithioesters under mild conditions, and the corresponding benzo[e]pyrazolo[1,5-c][1,3]thiazines were obtained in good to excellent yields. The novel method affords a
Dual Roles of β-Oxodithioesters in the Copper-Catalyzed Synthesis of Benzo[<i>e</i>]pyrazolo[1,5-<i>c</i>][1,3]thiazine Derivatives
作者:Li-Rong Wen、Wen-Kui Yuan、Ming Li
DOI:10.1021/acs.joc.5b00288
日期:2015.5.15
A facile and efficient method for the chemoselective synthesis of benzo[e]pyrazolo[1,5-c][1,3]thiazine derivatives has been developed by tandem Ullmann coupling reactions of β-oxodithioesters (ODEs) with 3-(2-bromoaryl)-1H-pyrazoles in C–S bond formation manner, in which ODEs play dual roles as both a substrate and a ligand. A series of benzo[e]pyrazolo[1,5-c][1,3]thiazine derivatives were provided
通过β-氧二硫代酯(ODEs)与3-(2-)的串联乌尔曼偶联反应,已经开发出一种简便高效的化学选择性合成苯并[ e ]吡唑并[1,5- c ] [1,3]噻嗪衍生物的方法。溴芳基)-1 H-吡唑以C–S键形成方式,其中ODE既充当底物又充当配体。在NaOH的存在下,在80°C的CH 3 CN中,以CuI为铜源,以良好的收率提供了一系列苯并[ e ]吡唑并[1,5- c ] [1,3]噻嗪衍生物。N 2气氛。
Dithioester-enabled chemodivergent synthesis of acids, amides and isothiazoles via C C bond cleavage and C O/C N/C S bond formations under metal- and catalyst-free conditions
作者:Sonam Soni、Suvajit Koley、Maya Shankar Singh
DOI:10.1016/j.tetlet.2017.05.064
日期:2017.6
operationally simple and user-friendly process to access privileged scaffolds such as acids, amides and isothiazoles has been devised employing β-ketodithioesters for the first time. Remarkably, the new protocol involves combination of CC bond cleavage and CO/CN/NS bond formations in one-pot. Aqueousammonia led to the formation of skeletally distinct amide and isothiazole, whereas aqueous NaOH enabled
首次设计了一种使用β-酮二硫酯的操作简单且用户友好的方法,可访问特权支架,例如酸,酰胺和异噻唑。值得注意的是,新方案涉及一锅中C C键断裂和C O / C N / N S键形成的组合。氨水导致骨骼上截然不同的酰胺和异噻唑的形成,而NaOH水溶液则使芳香酸的形成接近定量产率。这种实用的方法可以极大地简化简单分子的合成,具有高度的化学选择性,成本效益,可克量级,对水分不敏感以及具有很高的官能团相容性。