Alkylation of Phenols with N-(2,2,2-Trichloroethylidene)- and N-(2,2,2-Trichloroethyl)arenesulfonamides

N-(2,2,2-Trichloroethylidene)- and N-(2,2,2-trichloroethyl)arenesulfonamides react with phenol, 2-chlorophenol, and 2-methylphenol in the presence of oleum or sulfuric acid to give the corresponding 4-(2,2,2-trichloro-1-arylsulfonylaminoethyl)phenols in good yields.     

Amidine derivatives of α-arylglycines from N-(1-aryl-2,2,2-trichloroethyl)amides of arenesulfonic acids and secondary amines

The interaction of N-(1-aryl-2,2,2-trichloroethyl)amides of arenesulfonic acids with secondary amines or their salts in the presence of inorganic bases involves the formation of chloroaziridine intermediates. Depending upon the solvent and reagent ratio, the reaction results in N-[1-dialkylamino-2-chloro-2-arylethylidene]-, N-[2-dialkylamino-1-chloro-2-arylethylidene]-, N-[1,2-bis(dialkylamino)-2-arylethylidene]-, and N-(1,2-dioxo-2-arylethene)amides of arenesulfonic acids.     

Synthesis and Properties of N-(2,2,2-Trichloroethyl)-2-thiophenesulfonamides

Chlorination of 2-thiophenesulfonamide gave unstable N,N-dichloro-2-thiophenesulfonamide which was brought into reactions with 1,2-polyhaloethenes. The condensation of 2-thiophenesulfonamide with trichloroacetaldehyde afforded N-(2,2,2-trichloro-1-hydroxyethyl)-2-thiophenesulfonamide which reacted with benzene, toluene, 2-chlorothiophene, and phenol to form the corresponding N-(1-aryl-2,2,2-trichloroethyl)-2-thiophenesulfonamides. Under more severe conditions, the latter were converted into 1,1-diaryl-2,2,2-trichloroethanes. The reaction of N-(2,2,2-trichloro-1-hydroxyethyl)-2-thiophenesulfonamide with substituted arenes, including phenol, was regioselective: only the corresponding para-substituted products were obtained. Hydrolysis of N-[2,2,2-trichloro-1-(4-tolyl)ethyl]-2-thiophenesulfonamide yielded N-(2-thienylsulfonyl)-2-(4-tolyl)glycine.     

A new method for the synthesis of N-substituted (4-oxo-4,5,6,7-tetrahydroindol-3-yl)acetic acids

A new method for the synthesis of N-substituted 2-(4-oxo-4,5,6,7-tetrahydroindol-3-yl)acetic acids was developed. Alkylation of cyclic 1,3-diketones with 3,5,5,5-tetrachloropentan-2-one affords 1,4-diketones, which undergo cyclization with different primary amines into N-substituted 3-(2,2,2-trichloroethyl)-4,5,6,7-tetrahydroindol-4-ones. Acid hydrolysis of the latter gives the corresponding indol-3-ylacetic acids. The structures of the compounds obtained were confirmed by ¹H and ¹³C NMR data.     

Synthesis and Properties of N-(2,2,2-Trichloroethylidene)- and N-(2,2,2-Trichloroethyl)nitrobenzenesulfonamides

Highly reactive N-(2,2,2-trichloroethylidene)nitrobenzenesulfonamides were synthesized by reaction of N,N-dichloronitrobenzenesulfonamides with trichloroethylene. Reactions of N-(2,2,2-trichloroethylidene)nitrobenzenesulfonamides with oxygen and nitrogen nucleophiles gave products of addition at the double CÍN bond; with arenes and haloarenes, the corresponding C-amidoalkylation products were obtained.     

Sulfonamidation of halogen-substituted electrophiles with <Emphasis Type="Italic">N</Emphasis>-(2,2,2-trichloroethyl)arenesulfonamides

Reactions of N-(2,2,2-trichloroethyl)arenesulfonamides with primary alkyl bromides and iodides, allyl bromide, chloroacetonitrile, and benzyl chloride in acetonitrile on heating in the presence of potassium carbonate gave the corresponding N-alkyl-N-(2,2,2-trichloroethyl)arenesulfonamides.     

An IR Study of the Structure of New Thiocarboxylic Acid N-(1-Arenesulfonamido-2-phenyl-2,2-dichloroethyl- and -2,2,2-trichloroethyl)amides

An IR study of thiocarboxylic acid N-(1-arenesulfonamido-2-phenyl-2,2-dichloroethyl- and -2,2,2-trichloroethyl)amides revealed intramolecular hydrogen bonds whose formation is accompanied by electron density delocalization and stabilization of conformations with quasiaromatic rings. Formation of chelate species was confirmed by AM1 calculations.     

Reactions of <Emphasis Type="Italic">N</Emphasis>-(2,2,2-trichloroethylidene)- and <Emphasis Type="Italic">N</Emphasis>-(2,2-dichloro-2-phenylethylidene)arenesulfonamides with biuret

N-(2,2,2-Trichloroethylidene)- and N-(2,2-dichloro-2-phenylethylidene)arenesulfonamides react with an equimolar amount of biuret to give 1-(1-arylsulfonylamino-2,2,2-trichloroethyl)- or 1-(1-arylsulfonylamino-2,2-dichloro-2-phenylethyl)biurets. The reactions with 2 equiv of N-(polychloroethylidene)arenesulfonamides involve both amino groups in the biuret molecule, yielding the corresponding 1,5-bis(1-arylsulfonylamino-2,2,2-trichloroethyl)- and 1,5-bis(1-arylsulfonylamino-2,2-dichloro-2-phenylethyl)biurets.     

Reactions of Aroxy- and Arylsulfanylacetic Acids and Their Esters with N-(2,2,2-Trichloro-1-hydroxyethyl)sulfonamides and -carboxamides

C-Amidoalkylation of aroxy- and arylsulfanylacetic acids and their methyl esters was effected by reaction with N-(2,2,2-trichloro-1-hydroxyethyl)sulfonamides and -carboxamides in the presence of methane- or trifluoromethanesulfonic acids as catalyst and solvent. The process is regioselective, and the substitution occurs at the para-position with respect to the heteroelement-containing group.     

DI-(2,2,2-Trichloroethyl)-Carbonate: Byproduct in Reactions with 2,2,2-Trichloroethyl Chloroformate

2,2,2-Trichloroethyl chloroformate (1) in higher boiling solvents, particularly in the presence of potassium carbonate and potassium bicarbonate, affords undesired di-(2,2,2-trichloroethyl)-carbonate (2) as a byproduct. When chemically pure chloroformate was used, addition of carbonates was found to be unnecessary in N-demethylation reactions.     

Structure and proton-donor ability of N-(1-trifluoromethylsulfonylamino-2,2,2-trichloroethyl)-acrylamide

Quantum-chemical calculations (B3LYP/6-311G**) of N-(1-trifluoromethylsulfonylamino-2,2,2-trichloroethyl)acrylamide CF₃SO₂NHCH(CCl₃)NHC(O)CH=CH₂ (I) in the isolated state revealed four local minima corresponding to the conformers with the syn- and antiperiplanar orientation of the C=O and N-H bonds in the amide fragment, two of which containing the intramolecular C(O)NH…O=S or SO₂NH…O=C hydrogen bonds. Judged from the data of IR spectroscopy and dielectrometry, compound I in inert media exists predominantly in the form of conformer with antiperiplanar amide fragment and free NH group. Its self-associates in molecular crystals and solutions are formed by hydrogen bonds SO₂NH…O=C. Spectroscopic acidity of compound I determined as the value of Δν(NH) upon interactions with DMF in CCl₄ is higher than that of N-methyltrifluoromethanesulfonamide.     

Synthesis of N-arylsulfonyl-2-aryl(hetaryl)aminoacetic acids

Hydrolytic transformations of 4-[2,2,2-trichloro-1-(arylsulfonylamino)-and-(ethoxycarbonylamino)ethyl]phenyloxy(or sulfanyl)acetic acids under microwave irradiation in alkaline medium involve both trichloromethyl group and ester fragment to give N-arylsulfonyl-2-[4-carboxymethyloxy(or sulfanyl)phenyl]-2-aminoacetic acids in good yields. Hydrolysis of methyl 4-[2,2,2-trichloro-1-(arylsulfonylamino)ethyl]phenyloxy(or sulfanyl)acetates without microwave activation occurs only at the ester group with quantitative formation of 4-[2,2,2-trichloro-1-(arylsulfonylamino)ethyl]phenyloxy(or sulfanyl) acetic acids. N-[2,2,2-Trichloro-1-(1-naphthyl, 2-furyl, and 1-methylindol-3-yl)ethyl]-4-chlorobenzenesulfonamides in alkaline medium under microwave irradiation were converted in 10–15 min into the corresponding N-(4-chlorophenylsulfonyl)-2-aryl-2-aminoacetic acids in preparative yields.     

Sulfonylimines of Polychloroaldehydes in Reaction with Thioamides

N-(2,2,2-Trichloroethylidene)- and N-(2-phenyl-2,2-dichloroethylidene)amides of aromatic sulfonic acids react with thioacetamide, thiourea, and N-acetylthiourea at equimolar reagents ratio to furnish N-(1-arenesulfonamido-2,2,2-trichloroethyl)- and N-(1-arenesulfonamido-2-phenyl-2,2-dichloroethyl)thioamides. The reaction with deficient amount of thiourea results in N,N'-bis(1-arenesulfonamido-2-polychloroethyl)-thiocarbamides.     

Reduction of <Emphasis Type="Italic">N</Emphasis>-(polychloroethylidene)- and <Emphasis Type="Italic">N</Emphasis>-(1-hydroxypolychloroethyl) arenesulfonamides with adamantane in the presence of superacids

N-(2,2,2-Trichloroethylidene)-, N-(2,2-dichloro-2-phenylethylidene)-, and N-(1-hydroxy-2-polychloroethyl) arenesulfonamides reacted with adamantane in carbon tetrachloride in the presence of oleum or concd. H₂SO₄-P₄O₁₀ mixture to give the corresponding N-(2-polychloroethyl)arenesulfonamides as a result of reduc-tion of the azomethine and OH group, respectively.     

Synthesis and Properties of N-(2,2,2-Trichloroethylidene)trifluoromethanesulfonamide and Its Derivatives

The reaction of N,N-dichloromethanesulfonamide with trichloroethylene gave N-(2,2,2-trichloro- ethylidene)trifluoromethanesulfonamide which showed high reactivity toward oxygen- and nitrogen-centered nucleophiles, as well as in C-alkylation of aromatic compounds.     

Stereoselective electrogeneration of (E)-4-alkoxy-2-phenyl-5-chloro-2-oxazolines by cathodic reduction of N-(1-alkoxy-2,2,2-trichloroethyl)benzamides

The first method for the synthesis of the title compounds has been established. Quantitative reactions of benzamides with chloral hydrate provided chloralbenzamides which were efficiently converted to N-(1,2,2,2-tetrachloroethyl)amides by treatment with phosphorus pentachloride. These compounds reacted selectively with alcohols under mild conditions to give N-(1-alkoxy-2,2,2-trichloroethyl)benzamides in high yields which were stereoselectively transformed to (E)-4-alkoxy-2-aryl-5-chloro-2-oxazolines in fair to good yields by electrochemical reduction under constant cathodic potential in an aprotic medium.     

Oxidation of N-(1-Hydroxypolychloroethyl)sulfonamides

N-(2,2,2-Trichloro-1-hydroxyethyl)- and N-(2,2-dichloro-1-hydroxy-2-phenylethyl)arenesulfonamides are oxidized with chromium(VI) oxide to give, respectively, N-(arylsulfonyl)trichloroacetamides and N-(arylsulfonyl)dichloro(phenyl)acetamides. Under analogous conditions N-(2,2,2-trichloro-1-hydroxyethyl)trifluoromethanesulfonamide is converted into 1,1,1-trichloro-2,2-bis(trifluoromethylsulfonylamino)ethane.     

Synthesis of N-(5-Pyrazolyl) Schiff Bases Derived from Aryl Trifluoromethyl Ketones

5-Amino-1-aryl-4-methylpyrazoles readily add to methyl 1-aryl-2,2,2-trifluoroethylidenecarbamates to give the corresponding methyl 1-aryl-2,2,2-trifluoro-1-(5-pyrazolylamino)ethylcarbamates which undergo fragmentation at elevated temperature in the presence of an organic base to afford N-(5-pyrazolyl)-1-aryl-2,2,2-trifluoroethanimines.     

Unusual Cyclization of N-(1-Aryl-1-chloro-2,2,2-trifluoroethyl)-N'-(p-tolyl)-carbodiimides in the Presence of Triethylamine

1-Aryl-1-chloro-2,2,2-trifluoroethyl)-N'-(p-tolyl)carbodiimides treated with triethylamine undergo intramolecular cyclization into 4-aryl-6-methyl-2-triethylammonio-4-trifluoromethyl-4-dihydroquinazolidines.     

Synthesis and properties of esters and amido esters of 1-(2-thienyl)-2,2,2-trichloroethylphosphorous acid

Conclusions The esterification of amido- and ester-amidophosphites with 1-(2-thienyl)-2,2,2-trichloroethanol gave the l-(2-thienyl)-2,2,2-trichloroethyl dialkyl- and 1-(2-thienyl)-2,2,2-trichloroethyl alkylamidophosphites, which easily add sulfur or are oxidized to the corresponding thiophosphates and phosphates.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 182–187, January, 1981.