钒氧基和亚氨基配合物:V(NC 6 H 4 Me)(O t Bu)3(1),V(NC 6 H 4 Me)Cl 3(2),V(O)(O t Bu)3(3),V(O)(O i Pr)3(4),V(O)(acac)2(5)是对称碳二亚胺(RNCNR,其中R =环己基,异丙基和对甲苯基)复分解的催化剂)。在138℃下,在p二甲苯使用络合物5摩尔%1 - 5中,上述碳二亚胺的复分解,以非对称的碳二亚胺:Ñ -环己基,Ñ ' - p -tolylcarbodiimide(6),Ñ -异丙基,Ñ ' - p -tolylcarbodiimide(7),Ñ -环己基,Ñ '-isopropylcarbodiimide(8) 。取决于所使用的催化剂,在数分钟至数小时内达到碳二亚胺的平衡混合物。从气相色谱获得的产率为32%至70%。络合物2是最有效的催化剂,其周转频率大于100 h -1。羰基配合物(3– 5
Desulfurization Strategy in the Construction of Azoles Possessing Additional Nitrogen, Oxygen or Sulfur using a Copper(I) Catalyst
作者:Srimanta Guin、Saroj Kumar Rout、Anupal Gogoi、Shyamapada Nandi、Krishna Kanta Ghara、Bhisma K. Patel
DOI:10.1002/adsc.201200408
日期:2012.10.8
A tandem and convergent approach to various N-, O-, or S-containing azoles has been developed by exploiting the thiophilic property of copper(I) iodide used in a catalytic quantity. The present protocol gives access to amino-substituted tetrazoles, triazoles, oxadiazoles and thiadiazoles via oxidative desulfurization of their respective precursors followed by inter- or intramolecular attack of suitable
Ph<sub>3</sub>P/I<sub>2</sub>-Mediated Synthesis of <i>N,N</i>′<i>,N</i>″-Substituted Guanidines and 2-Iminoimidazolin-4-ones from Aryl Isothiocyanates
A convenient one-pot procedure for the synthesis of acyclic and cyclic guanidines mediated by the Ph3P/I2 system is described. Sequential condensation of aryl isothiocyanates with amines followed by dehydrosulfurization and guanylation could lead to both symmetric and unsymmetric N,N′,N″-substituted derivatives. Through a tandem guanylation–cyclization, a series of 2-iminoimidazolin-4-ones could also
描述了一种方便的一锅法,用于合成由Ph 3 P / I 2系统介导的无环和环状胍。芳基异硫氰酸酯与胺的顺序缩合,然后进行脱氢硫化和鸟苷化,可能同时导致对称和不对称的N,N ' ,N '' -取代的衍生物。通过串联的胍基化-环化反应,还可以从芳基异硫氰酸酯与氨基酸甲酯的反应中以高收率制备一系列2-iminoimidazolin-4-ones。
Micelle‐Enabled One‐Pot Guanidine Synthesis in Water Directly from Isothiocyanate using Hypervalent Iodine(III) Reagents under Mild Conditions
we developed a one-pot synthesis of guanidine directly from isothiocyanate using DIB (diacetoxyiodobenzene) as a desulfurizing agent under micellar conditions in water. Our optimization study revealed that the use of 1 % TPGS-750-M as a surfactant with NaOH as an additive base at room temperature can convert a variety of isothiocyanates and amines into corresponding guanidines in excellent yields (69-95 %)
The Synthesis of Some New Sulfur-Bearing Various Heterocyclic Systems Derived from Asymmetrical <i>N,N</i>′-Disubstituted Thiourea Derivatives
作者:Hosam Saad
DOI:10.1080/10426500500366301
日期:2006.6.1
N′-disubstituted thiourea (1a–d) in ring closure reactions with Br2/AcOH, ethyl chloroacetate, diethyl oxalate, diethyl malonate, and hydrazine hydrate led to the direct formation of sulfur-bearing various heterocyclicsystems (2–8) in which the thiaenolization is toward the aryl group. The synthetic work and reactivity investigations have been well supported by standard modern spectroscopic techniques (IR, 1 H NMR
不对称 N,N'-二取代硫脲 (1a-d) 在与 Br2/AcOH、氯乙酸乙酯、草酸二乙酯、丙二酸二乙酯和水合肼的闭环反应中的杂环化导致直接形成含硫的各种杂环系统(2-8) 其中噻吩醇化是针对芳基的。标准现代光谱技术(IR、1 H NMR、13 C NMR、质谱和微量分析)很好地支持了合成工作和反应性研究。
One-Pot Synthesis of C 2 Symmetric and Asymmetric N,N′,N′′-Substituted Guanidines from Aryl Isothiocyanates and Amines
Highly substituted guanidines were conveniently prepared through a one-pot reaction between aryl isothiocyanates and amines mediated by the Ph3P–I2/Et3N system. The C 2-symmetric N,N′,N′′-substituted guanidines were readily accessed using a 1:2 molar ratio of an aryl isothiocyanate and an amine; while sequential addition of two different amines in equimolar ratios gave rise to asymmetric derivatives
高度取代的胍可以通过异硫氰酸芳基酯和胺之间的一锅反应方便地制备,该反应由 Ph3P-I2/Et3N 系统介导。使用 1:2 摩尔比的异硫氰酸芳基酯和胺,可以很容易地获得 C 2 对称 N,N',N''-取代的胍;而以等摩尔比顺序加入两种不同的胺会产生不对称衍生物。伯胺和仲胺都被发现优先与缺电子的异硫氰酸芳基酯反应,在温和的条件下以良好的收率迅速提供胍。