A High Yielding, One-Pot, Triton-B Catalyzed Synthesis of Dithiocarbamates Using Alcoholic Tosylates

Summary. A novel process for the one-step chemoselective conversion of alcoholic tosylates into dithiocarbamates as protected amines was developed using benzyltrimethylammoniumhydroxide (Triton-B) in presence of carbon disulfide. Thus, dithiocarbamates of different amines were prepared in very good to excellent yields. This protocol is mild, chemoselective, and efficient compared to other reported methods. Present address: Institute of Organic and Biomolecular Chemistry, Georg-August University, D-37077, G?ttingen, Germany     

Convenient, Efficient One-Pot Synthesis of Ferrocenylcyanide

In asymmetric catalysis, chiral (central chiral, planar chiral, axial chiral) ferrocenylligands is one of the most successful class of auxiliaries in recent years, and some ofthem have reached the stage of industrial applications'. But many challenges remain forthe synthesis of the intermediate. One of them is how to get ferrocenylcyanide I directlyfrom ferrocenecarboxyaldehyde 2, which can be easily prepared according to thecorresponding literature2. As far as known, I is an important interm…     

Dithiocarbamates as Precursors in Organic Chemistry; Synthesis and Uses

Abstract

Organic dithiocarbamates have received great attention due to their interesting chemistry and wide utility as radical precursors and intermediates in organic synthesis. They also have found many of applications, that is, in agriculture and medicine. They are in use as pesticides, as well as in the rubber industries as vulcanization accelerators; and as antioxidants. Because they exhibit strong metal-binding capacity, they can act as in inhibitors of enzymes and have a profound effect on biological systems. Moreover, they have found application in the treatment of cancer and HIV.     

One-pot,Simple, and Convenient Synthesis of 2-Thioxo-2,3-dihydroquinazolin-4(1<Emphasis Type="Italic">H</Emphasis>)-ones

Summary. A simple and convenient method for the synthesis of diverse 2-thioxo-2,3-dihydroquinazolin-4(1H)-ones was developed as one-pot reaction of anthranilic acid esters, primary amines, and bis(benzotriazolyl)methanethione in presence of the amidine base DBU.     

Triton-B Catalyzed Efficient One-Pot Synthesis of Dithiocarbamate Esters

Summary. A novel process for the one-step chemoselective conversion of alkyl halides into dithiocarbamates as protected amines was developed using benzyltrimethylammonium hydroxide (Triton-B) in presence of carbon disulfide. Thus, dithiocarbamates of different amines were prepared in very good to excellent yields. This protocol is mild, chemoselective, and efficient compared to other methods. Present address: Institute of Organic and Biomolecular Chemistry, Georg–August University, D-37077 G?ttingen, Germany     

An Efficient One-Pot Synthesis of 2-Hydroxyalkyl Dithiocarbamates

Abstract

In the presence of anhydrous potassium phosphate, epoxides reacted with carbon disulfide and primary or secondary amines in acetone to give the corresponding 2-hydroxyalkyl dithiocarbamates regioselectively in moderate to good yield.     

Efficient and Convenient One-Pot Synthesis of Dioxadiazaphophepines

The reaction of vicinal dioxime with sodium hydride in dry THF followed by addition of dichlorophosphates or dichlorothiophosphates yields 2-oxo-1,3,4,7-dioxadiazaphosphepines and 2-thioxo-1,3,4,7-dioxodiazaphosphepines in moderate to good overall yields. The products are characterized by elemental analyses, molecular weights and spectral (IR, ¹H, ¹³C and ³¹P NMR) studies. A salt elimination route is used for the synthesis of titled heterocycles.     

无溶剂无催化剂条件下二硫代氨基甲酸酯衍生物的合成研究

主要研究了二硫代氨基甲酸酯衍生物的合成,将脂肪胺、CS2与α,β-不饱和羰基化合物或卤代烃在无溶剂无催化剂室温条件下,"一锅法"进行了Michael-type的加成反应,合成了二硫代氨基甲酸酯衍生物.该方法产率高,操作简单,是一种原子经济的合成方法,并可大规模地用于制药及农药方面.     

A Convenient One-Pot Synthesis of Phosphino-Dipeptide Analogs

A general "one-pot" synthetic method is described for the preparation of phosphinodipeptides of type 1 , in 60-80% overall yield, allowing the variation of the substituents in f and/or g position to the phosphorus atom and also in f position to the nitrogen atom.     

A Convenient One-Pot Synthesis of 1,2-Aminoalcohols

We have developed a rapid facile synthesis of 1,2-aminoalcohols from a variety of aldehyde starting materials. This one pot synthesis proceeds via the in situ formation of cyanohydrin trimethylsilyl ethers and the subsequent addition of Grignard reagents. This method is of particular use where the initial aldehyde exhibits water solubility.     

A Convenient One-Pot Synthesis of Di-t-butylphosphinic Chloride

A convenient one-pot synthesis of (t-Bu)₂P(O)Cl (1) from m-chloroperbenzoic acid and (t-Bu)₂PCl is described. The byproduct m-chlorobenzoic acid is neutralized by addition of Et₃N. Complex 1 crystallizes in the monoclinic space group P2₁/c (No. 14), with a = 5.9637(2) Å, b = 11.4734(4) Å, c = 16.2400(5) Å and β = 107.7160(14).     

A High Yielding, One-Pot, Triton-B Catalyzed, Expeditious Synthesis of Carbamate Esters by Four Component Coupling Methodology

Summary. A novel process for the one-step chemoselective conversion of alkyl halides into carbamates as protected amines was developed using benzyltrimethylammonium hydroxide (Triton-B) in presence of gaseous carbon dioxide. Thus, carbamate esters of different amines were prepared in very good to excellent yields. Present address: Institute of Organic and Biomolecular Chemistry, George–August University, 37077, G?ttingen, Germany     

A Convenient Two-Step One-Pot Synthesis of Alkylthiophosphoramidates Derivatives

N-thiophosphonylamino groups have been greatly overlooked as potentially potent, transition-state analogues, or tetrahedral--intermediate inhibitors of metalloproteases. Alkylthiophosphoramidates derivatives were synthesized y reaction of O-isopropyl phosphorodichloridothioate with an amino acid este followed by hydrolysis in 2M NH 4 OH. The reaction was monitored by 31 P NMR spectroscopy.     

Additive-Free Chemoselective Acylation of Amines and Thiols

Summary. Amines with different stereoelectronic nature were efficiently acylated at room temperature using acetic anhydride in the presence of no solvent or additive. Various thiols also react equally well under the same conditions. Chemoselective protection of amines in the presence of thiols, alcohols, and phenols and of thiols in the presence of alcohols, and phenols were achieved using competitive experiments.     

A One-Pot and Convenient Synthesis of Coumarins in Solventless System

An efficient and facile preparation of simple coumarins via in situ Wittig reaction of salicylaldehydes, triphenylphosphine, and chloroethylacetate supported on MgO in satisfactory yields in solvent-free condition.     

三丁基锡二硫代氨基甲酸酯的合成及表征

通过三丁基氯化锡与二硫代氨基甲酸盐反应,合成了１０个 三丁基锡二硫代氨基甲酸酯,利用元素分析,ＩＲ、ＨＮＭＲ、ＵＶ和ＴＧ－ＤＴＡ表征了这些化合物结构,测定了部分化合物的生物活性。     

1,3,5-三苯基苯的简便合成方法

采用氯化亚砜-无水乙醇为催化剂，以苯乙酮为原料一步合成了1，3，5-三苯基苯。研究了最佳反应配比和反应条件：反应时间为45～60min时，n(苯乙酮)／n(氯化亚砜)／n(乙醇)=3／15／5时反应产率达到最高，产率80％～85％，并对反应机理进行了讨论。     

A Convenient One-Pot Synthesis of Symmetric Secondary and Tertiary Vicinal Diamines

A convenient one-pot synthesis of symmetric vicinal diamines utilizing sodium borohydride/trifluoroacetic acid reduction methodology is described .     

A Convenient Mannich-Type One-Pot Synthesis of Pyrimido[6,1-b][1,3,5]thiadiazines

Summary. 3-(Het)aryl-2-cyanoprop-2-enethioamides easily reacted with primary amines and excessive formaldehyde under mild conditions to afford pyrimido[6,1-b][1,3,5]thiadiazine derivatives in moderate yields. Furthermore, 2-cyano-2-cyclohexylideneethanethioamide reacted in the similar Mannich-type manner to give spiro-conjugated pyrimido-1,3,5-thiadiazines. The structure of 3,7-dibenzyl-8-(fur-2-yl)-3,4,7,8-tetrahydro-2H,6H-pyrimido[6,1-b][1,3,5]thiadiazine-9-carbonitrile was determined by X-ray diffraction analysis.     

A Convenient One-Pot Synthesis and Nematicidal Activity of Nicotinic Acid Amides

Russian Journal of Organic Chemistry - Seven nicotinic acid amides were synthesized by condensation of nicotinic acid adsorbed on silica gel with different aromatic amines. The synthesized...