- A photochemical route to synthesize cryptosanguinolentine
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A synthesis of an indoloquinoline based alkaloid, isolated from Cryptolepis sanguinolenta is reported. The formation of a Schiff base between aniline and indole-3-carbaldehyde and subsequent photochemical transformation afforded the desired alkaloid.
- Kumar, R.Nandha,Suresh,Mohan
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- A new bifunctional heterogeneous nanocatalyst for one-pot reduction-Schiff base condensation and reduction-carbonylation of nitroarenes
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In this work, synthesis of Pd-NHC-γ-Fe2O3-n-butyl-SO3H and its activity as a bifunctional heterogeneous nanocatalyst containing Pd-NHC and acidic functional groups, are described. This newly synthesized nanomagnetic catalyst is fully characterized by different methods such as FT-IR, XPS, TEM, VSM, ICP and TG analysis. At first, the catalytic activity of Pd-NHC-γ-Fe2O3-n-butyl-SO3H is evaluated for the reduction of nitroarenes in aqueous media using NaBH4 as a clean source of hydrogen generation at ambient temperature. Using the promising results obtained from the nitroarene reduction, this catalytic system is used for two one-pot protocols including reduction-Schiff base condensation and reduction-carbonylation of various nitroarenes. In these reactions the in situ formed amines are further reacted with aldehydes to yield imines or carbonylated to amides. The desired products are obtained in good to high yields in the presence of Pd-NHC-γ-Fe2O3-n-butyl-SO3H as a bifunctional catalyst. The catalyst is reused with the aid of a magnetic bar for up to six consecutive cycles without any drastic loss of its catalytic activity.
- Sobhani, Sara,Chahkamali, Farhad Omarzehi,Sansano, José Miguel
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p. 1362 - 1372
(2019/01/24)
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- Ultrasound-assisted synthesis, anticonvulsant activity, and docking study of indole-appended thiazolidin-4-ones
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Two series of novel indolyl thiazolidin-4-one derivatives 4a-j and 5a-j were obtained by an ecofriendly synthetic protocol by treating a mixture of Schiff's bases (0.01 mol) with thioglycolic acid or thiolactic acid (0.01 mol) and anhydrous zinc chloride
- Nikalje, Anna Pratima G.,Shaikh, Sameer I.,Mulay, Abhineet,Khan, Firoz A. K.,Sangshetti, Jaiprakash N.,Shaikh, Shoaib
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p. 756 - 767
(2016/02/26)
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- Electronic spectral studies of some fluorescent probes: A comparison of two approaches
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Schiff base derivatives were synthesized and characterized by NMR spectra, mass and CHN analysis. The fluorescence properties of these dyes are strongly solvent dependent and the wavelength of maximum fluorescence emission shifts to red. The Kamlet-Taft a
- Anbuselvan,Jayabharathi,Thanikachalam,Jayamoorthy
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supporting information
p. 848 - 853
(2012/11/07)
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- Physico-chemical studies on some fluorescence sensors: DFT based ESIPT process
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A group of novel heterocyclic Schiff base derivatives were synthesized and characterized by NMR spectra, mass and CHN analysis. Excited state intramolecular proton transfer (ESIPT) processes in o-hydroxy Schiff base have been studied using electronic spec
- Anbuselvan, C.,Jayabharathi, J.,Thanikachalam, V.,Tamilselvi, G.
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p. 125 - 130,6
(2012/12/11)
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- Microwave assisted synthesis and antimicrobial evaluation of schiff bases of indole-3-aldehyde
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In order to develop new antimicrobial agents, a series of Schiff bases of indole-3-aldehyde were synthesized by microwave assisted synthesis by taking DMF as solvent and evaluated for their antimicrobial activity. All the synthesized compounds were charac
- Kamaria, Priyanka,Kawathekar,Chaturvedi, Prerna
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experimental part
p. 305 - 311
(2012/02/01)
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- An expeditious I2-catalyzed entry into 6H-indolo[2,3-b]quinoline system of cryptotackieine
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(Chemical Equation Presented) A synthesis of a series of novel 6H-indolo[2,3-b]-quinolines with different substituents on the quinoline ring is described. The method involves reaction of indole-3-carboxyaldehyde with aryl amines in the presence of a catal
- Parvatkar, Prakash T.,Parameswaran, Perunninakulath S.,Tilve, Santosh G.
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scheme or table
p. 8369 - 8372
(2010/02/17)
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- Aminophosphonates in the synthesis of new radioprotecting agents
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Reactions of bis(trimethylsilyl) hydrogen phosphite with Schiff bases derived from indole-3-carbaldehyde and aniline or ethyl p-aminobenzoate, as well as of diisopropyl hydrogen phosphite with N-benzylideneaniline, gave water-soluble sodium salts of α-aminophosphonic acids which are potential radioprotecting agents.
- Sal'keeva,Nurmaganbetova,Kurmanaliev,Gazizov
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p. 723 - 725
(2007/10/03)
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- C,H bond activation of imino substituted heterocycles: Synthesis and crystal structure of [μ2-η3-( R) N-CH2-C=C-C(H) =C(H)-X ]Fe2( CO) 6 and the isomeric clusters [μ2-η3-(R)N-CH2-C=C-X-C(R′)=C(R″)]Fe2(CO)6
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The reaction of Fe2(CO)9 with heterocyclic imines derived from thiophene-2-carbaldehyde or N-methyl-pyrrole-2-carbaldehyde produces the dinuclear compounds [μ2-η3-(R)N-CH2-C=C-C(H)-X(H)-X]Fe2(CO)6 (R = Ph, C6H11, p-tBu-C6H4; X = S, NMe). The analogous reaction with imines of thiophene-3-carbaldehyde or indole-3-carbaldehyde yields the corresponding isomeric clusters [μ2-η3-(R)N-CH2-C=C-X-C(R′)=C(R″)Fe2(CO)6 (R = Ph, C6H11, R′ = R″ = H, X = S; R = Ph, p-tBu-C6H4, R′ = R″ = -C6H4-, X = NH). The reaction proceeds via activation of the C,H bond in β-position relative to the exocyclic C,N double bond of the imine ligands. A 1,3 hydrogen shift reaction then leads to the formation of a methylene group instead of the former imine carbon atom. So, the imine ligands are transformed into μ2-η3-enyl-amido ligands being coordinated to an Fe2(CO)6 moiety, which is confirmed by X-ray structure analyses of six compounds.
- Imhof, Wolfgang
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- Low-valent titanium mediated reductive deoxygenation of carbonyls to methylenes via carbon-nitrogen bond cleavage in N-(arylmethyl) anilines
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The reduction of aryl aldehydes and ketones in neutral medium, to the corresponding hydrocarbons via carbon-nitrogen bond cleavage of the intermediate N-(arylmethyl) anilines with low-valent titanium reagents is described. It provides a mild, convenient and selective pathway for deoxygenation of carbonyls without the production of any side product.
- Talukdar,Banerji
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p. 1051 - 1056
(2007/10/03)
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