Highly Efficient One-Pot Synthesis of N-Sulfonylamidines by Cu-Catalyzed Three-Component Coupling of Sulfonyl Azide, Alkyne, and Amine

Crystal structures of (E)-3-(furan-2-yl)-2-phenyl-N-tosylacrylamide and (E)-3-phenyl-2-(m-tolyl)-N-tosylacrylamide

In the title N-tosyl­acryl­amide compounds, (I) and (II), the conformation about the C=C bond is E. In (I), the furan, phenyl and 4-methyl­benzene rings are inclined to the acryl­amide mean plane [–NH—C(= O)—C=C–] by 26.47 (11), 69.01 (8) and 82.49 (9)°, respectively. In (II), the phenyl, and 3-methyl and 4-methyl­benzene rings are inclined to the acryl­amide mean plane by 11.61 (10), 78.44 (10) and 78.24 (10)°, respectively. In the crystals of both compounds, mol­ecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers with (8) ring motifs.

In the title N-tosyl­acryl­amide compounds, C₂₀H₁₇NO₄S, (I), and C₂₃H₂₁NO₃S, (II), the conformation about the C=C bond is E. The acryl­amide groups, [–NH—C(=O)—C=C–], are almost planar, with the N—C—C=C torsion angle being −170.18 (14)° in (I) and −168.01 (17)° in (II). In (I), the furan, phenyl and 4-methyl­benzene rings are inclined to the acryl­amide mean plane by 26.47 (11), 69.01 (8) and 82.49 (9)°, respectively. In (II), the phenyl, 3-methyl­benzene and 4-methyl­benzene rings are inclined to the acryl­amide mean plane by 11.61 (10), 78.44 (10) and 78.24 (10)°, respectively. There is an intra­molecular C—H⋯π inter­action present in compound (II). In the crystals of both compounds, mol­ecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R₂²(8) ring motif. In (I), the dimers are reinforced by C—H⋯O hydrogen bonds and linked by C—H⋯π inter­actions, forming chains along [011]. In the crystal of (II), the dimers are linked via C—H⋯O hydrogen bonds, forming chains along [100]. The chains are further linked by C—H⋯π inter­actions, forming layers parallel to (010).

Copper-catalyzed three-component synthesis of aminonaphthoquinone-sulfonylamidine conjugates and in vitro evaluation of their antiproliferative activity

A series of aminonaphthoquinone-sulfonylamidine conjugates were synthesized via a copper-catalyzed three-component reaction of N-propargyl aminonaphthoquinone, sulfonyl azides and various amines. Majority of the compounds exhibited promising antiproliferative potential when evaluated against a panel of four cancer cell lines. Docking experiments of representative compounds indicated that the conjugates can occupy the ATP-binding pocket of topoisomerase-II enzyme.

Multicomponent polymerization: development of a one-pot synthetic route to functional polymers using diyne, N-sulfonyl azide and water/ethanol as reactants

Multicomponent polymerization: a one-pot synthetic route toward luminescent polymers.

Multicomponent sequential polymerizations of alkynes, carbonyl chloride and amino ester salts toward helical and luminescent polymers

Sequential coupling-hydroamination polymerizations toward helical and luminescent polymers.

Copper-catalyzed three-component cascade reaction of alkynes, sulfonyl azides and simple aldehydes/ketones

A copper-catalyzed dimethylzinc-promoted three-component cascade reaction of alkynes, sulfonyl azides, and simple aldehydes or ketones is described, which delivers polysubstituted olefins expeditiously in one pot under mild conditions.

One-pot sequential multicomponent reaction and a multicomponent polymerization method for the synthesis of topologically different polymers

The synthesis of topologically different polymers via a one-pot sequential multicomponent reaction and multicomponent polymerization is reported.

Base-induced synthesis of N-dialkylaminomethyl-2H-1,2,3-triazoles from N-sulfonyl-1,2,3-triazoles

A facile synthetic method to access N-dialkylaminomethyl-2H-1,2,3-triazoles has been developed from N-sulfonyl-1,2,3-triazoles by a base induced reaction. Moreover, 4-phenyl-1H-1,2,3-triazoles can also give the same product even in the absence of a base at high temperature.

Potentially antibreast cancer enamidines via azide–alkyne–amine coupling and their molecular docking studies

Potentially antibreast cancer enamidines were synthesized and evaluated against human breast cancer cell line MCF7 displaying GI₅₀values lower than doxorubicin.

Efficient synthesis of N-arylsulfonyl-1,2,3-triazoles from 1,1-dibromo-2-arylethylenes

-arylsulfonyl-1,2,3-triazoles were synthesized from 1,1-dibromo-2-arylethylenes via a one-pot reaction involving the Cs

Copper iodide nanoparticles supported on magnetic aminomethylpyridine functionalized cellulose: a new heterogeneous and recyclable nanomagnetic catalyst for facile access to N-sulfonylamidines under solvent free conditions

A highly active catalyst based on CuI nanoparticles supported on magnetic aminomethylpyridine functionalized cellulose has been synthesized. It well catalyzes the multicomponent synthesis of N-sulfonylamidines under solvent free conditions.

Copper-catalysed azide-alkyne cycloadditions (CuAAC): an update

The reactions of organic azides and alkynes catalysed by copper species represent the prototypical examples of click chemistry. The so-called CuAAC reaction (copper-catalysed azide-alkyne cycloaddition), discovered in 2002, has been expanded since then to become an excellent tool in organic synthesis. In this contribution the recent results described in the literature since 2010 are reviewed, classified according to the nature of the catalyst precursor: copper(I) or copper(II) salts or complexes, metallic or nano-particulated copper and several solid-supported copper systems.

Palladium-catalyzed three-component reaction of N-tosyl hydrazones, isonitriles and amines leading to amidines

A palladium-catalyzed three-component reaction between N-tosyl hydrazones, aryl isonitriles and amines was developed, leading to amidines in moderate to good yields. This procedure features the rapid construction of amidine frameworks with high diversity and complexity. Ketenimines serve as intermediates, which encounter nucleophilic attack by amines to produce amidines.

Copper-catalyzed direct transformation of simple alkynes to alkenyl nitriles via aerobic oxidative N-incorporation

A novel Cu-catalyzed aerobic oxidative N-incorporation into aliphatic terminal alkynes for the synthesis of alkenyl nitriles has been reported. The usage of inexpensive copper catalyst, O₂ as the sole oxidant, broad substrate scope as well as the feasibility for “the late-stage modification” make this protocol very promising.

A novel direct transformation of aliphatic terminal alkynes to alkenyl nitriles through the incorporation of a nitrogen atom into the simple hydrocarbons has been reported. The usage of inexpensive copper catalyst, O₂ as the sole oxidant, broad substrate scope as well as feasibility for “late-stage modification” make this protocol very promising. Mechanistic studies including DFT calculation demonstrate a novel 1,2-hydride shift process for this novel nitrogenation reaction.

Synthesis of N-Imidoyl and N-Oxoimidoyl Sulfoximines from 1-Alkynes, N-Sulfonyl Azides, and Sulfoximines

N-Imidoylation of sulfoximines is developed from a Cu-catalyzed three-component reaction from 1-alkynes, N-sulfonyl azides, and sulfoximines in THF at room temperature under air. In addition, N-oxoimidoylation of sulfoximines is accessed from a Cu-catalyzed three-component reaction from 1-alkynes, N-sulfonyl azides, and sulfoximines in THF at room temperature followed by a Cu-catalyzed oxidative reaction at 50 °C under air, producing N-oxoimidoyl sulfoximines.

Bromoform reaction of tertiary amines with N,N-dibromosulfonamides or NBS/sulfonamides

A new bromoform reaction of tertiary amines with N,N-dibromosulfonamides or NBS/sulfonamides has been developed. A series of amidines were prepared with moderate to good yields via a Csp(3)-Csp(3) bond cleavage.

1,2,3-Triazoles from carbonyl azides and alkynes: filling the gap

Electron deficient azides are challenging substrates in CuAAC reactions. Particularly, when N-carbonyl azides are applied the formation of N-carbonyl triazoles has not yet been observed. We report herein the first example of this class of reaction, with a copper-based system that efficiently enables the synthesis of N-carbamoyl 1,2,3-triazoles by [3+2] cycloaddition of N-carbamoyl azides and alkynes.

Synthesis of 3-Sulfonylamino Quinolines from 1-(2-Aminophenyl) Propargyl Alcohols through a Ag(I)-Catalyzed Hydroamination, (2 + 3) Cycloaddition, and an Unusual Strain-Driven Ring Expansion

We describe herein a silver-catalyzed conversion of 1-(2-aminophenyl)-propargyl alcohols to 4-substituted 3-tosylaminoquinolines using TsN3 as an amino surrogate. Controlled reactions reveal the pathway consisting of Ag(I)-catalyzed 5-exo-dig cyclization, catalyst-free (2 + 3) cycloaddition, and ring-expansive rearrangement via nitrogen expulsion. As a support study, we show that the cyclic enamines in similar conditions produce amidines via a C-C bond migration.

Cu-catalyzed aerobic oxidative three-component coupling route to N-sulfonyl amidines via an ynamine intermediate

Cu-catalyzed aerobic oxidative three-component coupling of a terminal alkyne, secondary amine, and sulfonamide enables efficient synthesis of amidines. The use of Cu(OTf)2 (5 mol %) produces amidines selectively without Glaser-Hay alkyne homocoupling products. Preliminary studies suggest that the reaction pathway involves initial oxidative coupling of the terminal alkyne with the secondary amine, followed by hydroamidation of the ynamine intermediate with the sulfonamide.

One-pot synthesis of hydrazono-sulfonamide adducts using Cu(BTC) MOF catalyst and their remarkable AIEE properties: unprecedented copper(ii)-catalyzed generation of ketenimine

One pot & simple operation; short reaction time; no column purification; very less catalyst loading; scalable.

Rhodium catalysed conversion of carbenes into ketenes and ketene imines using PNN pincer complexes

PNN pincer-type rhodium complexes catalyze ketene and ketene imine synthesis, using CO or an isocyanide and a carbene precursor.

Unexpected CN bond formation via NaI-catalyzed oxidative de-tetra-hydrogenative cross-couplings between N,N-dimethyl aniline and sulfamides

A direct de-tetra-hydrogenative cross-coupling reaction between C_sp3–H bonds and sulfamide under transition-metal-free conditions is reported to give the corresponding amidines.

Copper-catalyzed multi-component synthesis of acrylamidines and benzoimidazoles

Acrylamidines were synthesized via the copper-catalyzed three-component reaction of propargyl acetates, sulfonyl azides and amines, which are readily accessible materials.

Cyclization of sulfide, ether or tertiary amine-tethered N-sulfonyl-1,2,3-triazoles: a facile synthetic protocol for 3-substituted isoquinolines or dihydroisoquinolines

A novel cyclization reaction of sulfide, ether or tertiary amine-tethered N-sulfonyl-1,2,3-triazoles, has been developed, efficiently affording 3-substituted isoquinoline or dihydroisoquinoline derivatives.