Thionation with the Reagent Combination of Phosphorus Pentasulfide and Hexamethyldisiloxane
作者:Thomas J. Curphey
DOI:10.1021/jo0256742
日期:2002.9.1
The combination of P4S10 and hexamethyldisiloxane efficiently converts esters, lactones, amides, lactams, and ketones to their corresponding thiono derivatives. In the presence of elemental sulfur, 3-oxoesters are converted to dithiolethiones by this reagent. Yields are comparable to or superior to those obtained with Lawesson's reagent. The method has the advantage that reagent-derived byproducts
Palladium(0)-Catalyzed, Copper(I)-Mediated Coupling of Boronic Acids with Cyclic Thioamides. Selective Carbon−Carbon Bond Formation for the Functionalization of Heterocycles<sup>†</sup>
作者:Hana Prokopcová、C. Oliver Kappe
DOI:10.1021/jo070408f
日期:2007.6.1
Employing controlled microwaveirradiation at 100 °C, most cross-couplings can be completed within 2 h and proceed in high yields. An advantage of using thioamides as starting materials is the fact that the system can be tuned to an alternative carbon−sulfur cross-coupling pathway by changing to stoichiometric copper(II) under oxidative conditions. Both types of thioamide cross-couplings are orthogonal to
We report a coupling reaction of thioamides and sulfonyl azides to generate sulfonyl amidines in the absence of any activation additives. The reaction progresses in various solvents under mild conditions. Water exhibits the highest performance with respect to efficiency.
Thionations Using a P<sub>4</sub>S<sub>10</sub>−Pyridine Complex in Solvents Such as Acetonitrile and Dimethyl Sulfone
作者:Jan Bergman、Birgitta Pettersson、Vedran Hasimbegovic、Per H. Svensson
DOI:10.1021/jo101865y
日期:2011.3.18
Tetraphosphorusdecasulfide (P4S10) in pyridine has been used as a thionatingagent for a long period of time. The moisture-sensitive reagent has now been isolated in crystalline form, and the detailed structure has been determined by X-ray crystallography. The thionating power of this storable reagent has been studied and transferred to solvents such as acetonitrile in which it has proven to be synthetically
四硫化二磷(P 4 S 10)中的吡啶已长期用作硫代剂。现在已经以结晶形式分离出对水分敏感的试剂,并且已经通过X射线晶体学确定了详细的结构。已经研究了这种可储存试剂的去硫能力,并将其转移到诸如乙腈之类的溶剂中,在该溶剂中已证明其在合成上是有用的并且具有非凡的选择性。它的性能已经与所谓的Lawesson试剂(LR)进行了比较。特别有趣的是在相对较高的温度(约165°C)下以二甲基砜为溶剂进行硫磺化的结果。在这些条件下,例如,a啶酮和3-乙酰吲哚可以迅速转化为相应的亚硫代衍生物。甘氨酰甘氨酸类似地得到哌嗪去甲酮。在这些温度下 LR由于快速分解而效率低下。硫代产物通常更清洁并且更容易获得,因为在结晶试剂中,常规试剂P中始终存在杂质吡啶或LR中的4 S 10已被除去。
Ruthenium Catalyzed Synthesis of Enaminones
作者:Naga Durgarao Koduri、Halee Scott、Bethany Hileman、Justin D. Cox、Michael Coffin、Lindsay Glicksberg、Syed R. Hussaini
DOI:10.1021/ol202812d
日期:2012.1.20
catalyst has been found to be an effective catalyst for the synthesis of enaminones by coupling thioamides with α-diazodicarbonyl compounds. The reaction is successful in converting primary, secondary, and tertiary thioamides into their corresponding enaminones. The reaction is also suitable for the synthesis of chiral enaminones.