在无金属和无催化剂的条件下,通过C C键断裂和C O / C N / C S键形成,使二硫酯能够化学发散合成酸,酰胺和异噻唑
摘要:
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。
Yb(OTf)<sub>3</sub> catalyzed [3 + 2] annulations of D–A cyclopropanes with β-oxodithioesters: a regioselective synthesis of tetrahydrothiophenes
作者:Shu-Wen Wang、Wei-Si Guo、Li-Rong Wen、Ming Li
DOI:10.1039/c5ra06355h
日期:——
An efficient approach to synthesis tetrahydrothiophenes was developed through the reaction of β-oxodithioesters and D–A cyclopropanes catalyzed by Yb(OTf)3. This methodology was highly regioselective.
A new general method for the synthesis of thiophenes through acid mediated cyclization of mixed acetals derived from β-oxodithiates and bromoacetaldehyde acetal
presence of anhydrous potassium carbonate in dimethyl formamide at 80 °C to yield the corresponding mixed acetals. These acetals undergo smooth cyclization in the presence of ethanolic orthophosphoric acid to afford the corresponding 2-methylthio-3-acyl/aroyl/heteroaroyl thiophenes in 64–85% high overall yields.
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。
Unusual Behavior of Ketoximes: Reagentless Photochemical Pathway to Alkynyl Sulfides
The unique properties of ketoximes are used prominently for the synthesis of heterocycles. In contrast, their potential to absorb light and photoelectron transfer processes remains challenging. Widespread interest in controlling direct excitation of ketoxime tacticity unlocks unconventional reaction pathways, enabling photochemical intramolecular skeletal modification to constitute alkynyl sulfides
Radical-Cascade Avenue to Access 1,2-Dithioles Employing Dithioesters and Edman’s Reagent
作者:Pragya Pali、Maya Shankar Singh
DOI:10.1021/acs.orglett.3c00509
日期:——
etiquette has been developed for the facileconstruction of 1,2-dithioles employing easily accessible dithioesters as a three-atom CCS synthon and aryl isothiocyanates as a two-atom CS unit in the absence of any catalyst and additive at room temperature under open air. The reaction proceeded efficiently affording the desired 1,2-dithioles in good yields having various functional groups of a diverse electronic