AbstractAn unprecedented metal‐free oxidative homodimerization of α‐enolic dithioesters has been achieved for the first time at room temperature within 5–10 min. Molecular iodine promotes the SS coupling leading to S,S′‐bis(dithioacetals), while N‐chlorosuccinimide facilitates CC coupling to give α,α′‐bis(β‐oxo dithioesters) in good to excellent yields. Furthermore, the newly generated α,α′‐bis(β‐oxo dithioesters) have been directly employed in the synthesis of fully substituted thiophenes with a unique symmetrical substitution pattern in a one‐pot, two‐step reaction sequence.magnified image
Cooperative metal–ligand influence on the formation of coordination polymers, and conducting and photophysical properties of Tl(<scp>i</scp>) β-oxodithioester complexes
作者:Chote Lal Yadav、Gunjan Rajput、Krishna K. Manar、Kavita Kumari、Michael G. B. Drew、Nanhai Singh
DOI:10.1039/c8dt03694b
日期:——
considering the metal-assisted bonding interactions, various coordination numbers of 5–8 and 10 are established around the metal centre. Except for 5 and 7a which have Tl⋯Tl separations at 3.724(1) and 3.767(1), 3.891(1) Å respectively, the remaining complexes have no Tl⋯Tl distances <4.0 Å. This indicates that the majority of structures contain only weak inter- and intramolecular thallophilic interactions
八个新颖的Tl(I)β-氧二硫代酯络合物[TlL] n(1–8),带有配体,L = 3-羟基-3-(2-呋喃基)-2-丙二硫代乙酸甲酯(L1),甲基3 -羟基-3-(2-噻吩基)-2-丙二硫代酸酯(L2),甲基3-羟基-3-(3-吡啶基)-2-丙二硫代酸酯(L3),-3-羟基-3-(4-甲基)吡啶基)-2-丙二硫代酸酯(L4),-3-羟基-3-(9-蒽基)-2-丙二硫代甲酸甲酯(L5),-3-羟基-3-(4-氟苯基)-2-丙二硫代甲酸甲酯(L6 )合成了3-羟基-3-(4-氯苯基)-2-丙二硫代酸甲酯(L7)和3-羟基-3-(4-溴苯基)-2-丙二硫代酸甲酯(L8),并进行了彻底表征元素分析,IR,UV-Vis,1 H和13 C 11 H NMR光谱及其结构通过X射线晶体学确定。络合物1和2中结晶P 2 1和P 2个1 2 1 2 1分别手性的空间群,以及使用圆二色性(CD)光谱进行了
Impact of ligand substituents on the crystal structures, optical and conducting properties of phenylmercury(II) β-oxodithioester complexes
作者:Kavita Kumari、Michael G.B. Drew、Nanhai Singh
DOI:10.1016/j.jorganchem.2020.121532
日期:2020.12
New phenylmercury(II) complexes 1–5 with functionalized β-oxodithioester ligands, [PhHg(II) (β-oxodithioester)], β-oxodithioester = methyl-3-hydroxy-3-(4-pyridyl)-2-propenedithioate L1 1, methyl-3-hydroxy-3-(p-chlorophenyl)-2-propenedithioate L2 2, methyl-3-hydroxy-3-(naphthyl)-2-propenedithioate L3 3, methyl-3-hydroxy-3-(9-anthracenyl)-2-propenedithioate L4 4 and methyl-3-hydroxy-3-(p-fluoropheny
An expedient route to highly functionalized 2H-chromene-2-thiones via ring annulation of β-oxodithioesters catalyzed by InCl3 under solvent-free conditions
作者:Rajiv Kumar Verma、Girijesh K. Verma、Keshav Raghuvanshi、Maya Shankar Singh
DOI:10.1016/j.tet.2010.11.055
日期:2011.1
A convenient and one-pot synthesis of 3-aroyl/heteroaroyl-2H-chromene-2-thiones and benzo[f]2H-chromene-2-thiones has been developed by the condensation of β-oxodithioesters and salicylaldehydes/α-hydroxynaphthaldehydes in the presence of indium trichloride under solvent-free conditions. The reaction is operationally facile, readily scalable, and offers rapid entry into differentially substituted chromene-2-thione
通过β-氧代二硫代酯与水杨醛/α-的缩合反应,开发出了一种方便的一锅合成3-芳酰基/杂芳酰基-2 H-亚甲基-2-硫酮和苯并[ f ] 2 H-亚甲基-2-硫酮的方法。在无溶剂条件下在三氯化铟存在下生成羟基萘醛。该反应操作简便,易于扩展,可快速进入差异取代的亚甲基-2-硫酮骨架。
Et3N mediated synthesis of polysubstituted thiophenes from α-oxo ketene dithioacetals
In this Letter, an efficient synthetic route to prepare polysubstituted thiophene derivatives was achieved via the Et3N-mediated (Claisen) rearrangement reaction from α-oxo S-methyl-S-propargyl ketenes, which were obtained through alkylation of β-oxodithioesters with propargylic bromides, followed by regioselective intramolecular cyclization.
A facile access to thiazolidin-4-ones from α-enolic dithioesters and α-halohydroxamates in situ derived active 1,3-dipolar aza-oxyallyl cations was achieved under mild conditions.