Cyanoselenoacetamide in a new synthesis of propane-bis(thioamide), the promising reagent for heterocyclizations
摘要:
Cyanoselenoacetamide reacts with hydrogen sulfide to form propane-bis(thioamide), which can be used to produce thiazoles (the Hantzsch synthesis) and 3-thioxo-1-phenyl-2,3,5,6,7,8-hexahydroisoquinoline-4-carbonitrile. From the latter compound, 2-alkylsulfanyl-1-phenyl-5,6,7,8-tetrahydroisoquinoline-4-carbonitriles and 1-amino-N-(4-bromophenyl)-5-phenyl-6,7,8,9-tetrahydrothieno[2,3-c]isoquinoline-2-carboxamide can be prepared.
Thion-und Dithioester, 44. Mitt. Zur Reaktion von Tetrathiomalonestern mit Aminen, Hydrazinen und Oxidationsmitteln
作者:Ali Afrashteh、Klaus Hartke
DOI:10.1002/ardp.19883211216
日期:——
Tetrathiomalonsäure‐diethylester (1) bildet mit primären und sekundären aliphatischen Aminen die Malonsäuredithioamide 2, mit primärenaromatischenAminen die β‐Amino‐dithioacrylester 3. Methyl‐und Phenylhydrazin cyclisieren mit 1 zu den Pyrazolen 4 und 5. Die Oxidationvon 1 liefert die 1,2‐Dithioliumsalze 8, die mit CH‐aciden Thionessigestern 9 zu den 1,6,6aλ4‐Trithiapentalenen 10 kondensieren.
Metal Chelation Aptitudes of Bis(<i>o</i>-azaheteroaryl)methanes As Tuned by Heterocycle Charge Demands<sup>1</sup>
作者:Alessandro Abbotto、Silvia Bradamante、Antonio Facchetti、Giorgio A. Pagani
DOI:10.1021/jo025696o
日期:2002.8.1
benzimidazole, pyridine, and quinoline derivatives. Depending on the structure and electron properties of the ligand, a vast set of neutral chelates ML(2) were obtained, where the ligand is present in its carbanionic form L(-). Additionally, we have prepared salt complexes [M(LH)(n)]X(m), where the ligand is present as a neutral system. Neutral chelates were typically obtained by the reaction of the ligand with
我们描述了许多1,3,azol-2-yl-,1,3-benzazol-2-yl-和基于azinyl的双(o-azazeteroarylaryl)甲烷的合成(LH,L(-)= Het (2)CH(-))及其对二价过渡金属(Zn,Cu,Co,Ni,Hg,Pd)的配位性能。这项广泛的研究包括基于几种取代和/或未取代的噻唑,苯并噻唑,苯并恶唑,苯并咪唑,吡啶和喹啉衍生物的对称和不对称配体。根据配体的结构和电子性质,获得了大量中性螯合物ML(2),其中配体以其碳负离子形式L(-)存在。此外,我们还制备了盐配合物[M(LH)(n)] X(m),其中配体以中性系统存在。中性螯合物通常是通过配体与金属乙酸盐在酒精溶液中的反应获得的。盐配合物是通过与其他金属盐(如氯化物)反应而形成的。通过基于可变的π电子结构和取代模式的杂芳族化合物探索几种二杂芳基甲烷配体的配位性质,我们证明中性螯合物的形成严格取决于杂芳族
Aliphatic and aromatic nitriles react with thioacetic acid in the presence of calcium hydride to give the corresponding thioamides in good to excellent yields. The examples studied include haloaryl nitriles in which the halogen is facile towards S N Ar reactions under other conditions.
脂肪族和芳香族腈在氢化钙存在下与硫代乙酸反应,以良好到极好的收率得到相应的硫代酰胺。研究的例子包括卤代芳基腈,其中卤素在其他条件下容易发生 SN Ar 反应。
Synthesis of Primary Thioamides from Nitriles and Hydrogen Sulfide Catalyzed by Anion-Exchange Resin
作者:Miroslav Bobek、Radek Liboska、Daniel Zyka
DOI:10.1055/s-2002-33649
日期:——
A newmethod has been developed for convertingnitriles into primary thioamides. Treatment of various nitriles (Table 1, entries 1-12) with gaseous hydrogen sulfide in a mixture of methanol-water or ethanol-water and in the presence of anion-exchange resin (Dowex I XX. SH form) at room temperature and ambient pressure gave the corresponding thioamides in 25-96% yield.
已开发出一种将腈类转化为伯硫代酰胺的新方法。在室温和环境温度下,在存在阴离子交换树脂(Dowex I XX. SH 型)的情况下,在甲醇-水或乙醇-水的混合物中用气态硫化氢处理各种腈(表 1,条目 1-12)加压得到相应的硫代酰胺,产率为25-96%。
Hetero-calix[4]pyrroles: incorporation of furans, thiophenes, thiazoles or fluorenes as a part of the macrocycle
作者:Mi-Young Song、Hee-Kyung Na、En-Young Kim、Si-Joon Lee、Kyung Il Kim、Eun-Mi Baek、Hong-Seok Kim、Duk Keun An、Chang-Hee Lee
DOI:10.1016/j.tetlet.2003.10.170
日期:2004.1
Furans, thiazoles, fluorene or thiophene incorporated calix[4]pyrrole analogues were synthesized and characterized. The synthesis was achieved by utilization of various building blocks such as 7, 13, 14, 18 and 21. Acid catalyzed condensation of those building blocks with acetone or meso-disubstituted dipyrromethanes afforded desired macrocycles.