63412-06-6Relevant academic research and scientific papers
Tert -Butyl nitrite promoted transamidation of secondary amides under metal and catalyst free conditions
Sureshbabu, Popuri,Azeez, Sadaf,Chaudhary, Priyanka,Kandasamy, Jeyakumar
supporting information, p. 845 - 850 (2019/01/30)
A mild and efficient method is demonstrated for the transamidation of secondary amides with various amines including primary, secondary, cyclic and acyclic amines in the presence of tert-butyl nitrite. The reaction proceeds through the N-nitrosamide intermediate and provides the transamidation products in good to excellent yields at room temperature. Moreover, the developed methodology does not require any catalyst or additives.
Chemoselective Synthesis of Aryl Ketones from Amides and Grignard Reagents via C(O)-N Bond Cleavage under Catalyst-Free Conditions
Sureshbabu, Popuri,Azeez, Sadaf,Muniyappan, Nalluchamy,Sabiah, Shahulhameed,Kandasamy, Jeyakumar
, p. 11823 - 11838 (2019/10/02)
Conversion of a wide range of N-Boc amides to aryl ketones was achieved with Grignard reagents via chemoselective C(O)-N bond cleavage. The reactions proceeded under catalyst-free conditions with different aryl, alkyl, and alkynyl Grignard reagents. α-Ketoamide was successfully converted to aryl diketones, while α,β-unsaturated amide underwent 1,4-addition followed by C(O)-N bond cleavage to provide diaryl propiophenones. N-Boc amides displayed higher reactivity than Weinreb amides with Grignard reagents. A broad substrate scope, excellent yields, and quick conversion are important features of this methodology.
Tert-Butyl Nitrite-Mediated Synthesis of N-Nitrosoamides, Carboxylic Acids, Benzocoumarins, and Isocoumarins from Amides
Yedage, Subhash L.,Bhanage, Bhalchandra M.
, p. 5769 - 5781 (2017/06/07)
This work reports tert-butyl nitrite (TBN) as a multitask reagent for (1) the controlled synthesis of N-nitrosoamide from N-alkyl amides, (2) hydrolysis of N-methoxyamides to carboxylic acids, (3) metal- and oxidant-free benzocoumarin synthesis from ortho-aryl-N-methoxyamides via N-H, C-N, and C-H bond activation, and (4) isocoumarin synthesis using Ru(II)/PEG as a recyclable catalytic system via ortho-C-H activation and TBN as an oxygen source. The sequential functional group interconversion of amide to acid has also been examined using IR spectroscopic analysis. Additionally, this methodology is highly advantageous due to short reaction time, gram scale synthesis, and broad substrate scope.
Photochemical activities of n-nitroso carboxamides and sulfoximides and their application to DNA cleavage
Hwu, Jih Ru,Huang, Joseph Jen Tse,Tsai, Fu-Yuan,Tsay, Shwu-Chen,Hsu, Ming-Hua,Hwang, Kuo Chu,Horng, Jia-Cherng,Ho, Ja An Annie,Lin, Chun-Cheng
experimental part, p. 8742 - 8750 (2010/03/31)
N-Nitroso compounds containing benzene, fluorene or fluorenone rings were synthesized. Photolysis of these compounds with 312-nm UV light provided the NO species, the presence of which was corroborated by use of an EPR method and of 2phenyl-4,4,5,5-tetramethylimidazolin-loxyl 3-oxide (PTIO) as a trapping agent. During irradiation of N-methylN-nitroso-9-fluorenone carboxamide (14c) in the absence of PTIO, it underwent decomposition followed by re-combination to give the heterocyclic nitric oxide radical 15. Incorporation of intercalating moieties endowed the Nnitroso compounds with DNA-cleaving ability through single-strand scission upon UV irradiation in a phosphate buffer (pH 5.0-8.0) under aerobic conditions.
Selective N-nitrosation of amines, N-alkylamides and N-alkylureas by N2O4 supported on cross-linked polyvinylpyrrolidone (PVP-N2O4)
Iranpoor, Nasser,Firouzabadi, Habib,Pourali, Ali-Reza
, p. 1591 - 1597 (2007/10/03)
N2O4 was supported on the cross-linked polyvinylpyrrolidone (PVP) to afford a solid, stable and recyclable nitrosating agent. This reagent shows excellent selectivity for N-nitrosation of dialkyl amines in the presence of diaryl-, arylalkyl-, trialkylamines and also for secondary amides in dichloromethane at room temperature under mild and heterogeneous conditions. Also N-nitroso-N-alkyl amides can be selectively prepared in the presence of primary amides and N-phenylamides under similar reaction conditions. Selective N-nitrosation or dealkylation and N-nitrosation of tertiary amines can also be performed by this reagent.
Reaction of amides with nitric oxide (NO)
Itoh, Takashi,Nagata, Kazuhiro,Matsuya, Yuji,Miyazaki, Michiko,Ohsawa, Akio
, p. 5017 - 5020 (2007/10/03)
Amides were allowed to react with nitric oxide in aprotic and non- ethereal solvents to give the corresponding N-nitroso derivatives. The reaction was accelerated by addition of oxygen. The solvent effect revealed that the reaction did not proceed in the presence of protic media.
Reaction of N-Aryl- and N-Alkyl-benzimidoyl Chlorides with Silver Nitrate
Iley, Jim,Carvalho, Emilia,Norberto, Fatima,Rosa, Eduarda
, p. 281 - 290 (2007/10/02)
N-Arylbenzimidoyl chlorides, in which the N-aryl group is unsubstituted at the ortho- and para-positions, react with AgNO3 to yield N-(nitroaryl)benzamides, in which the NO2 group resides in the ortho- or para-position.N-Arylbenzimidoyl chlorides, in which the N-aryl ring is 2,4,6-trisubstituted, react with AgNO3 to yield the corresponding N-aryl-N-nitrobenzamides.The formation of both types of product can be explained by the intermediacy of an O-nitro imidate.Spectroscopic and chemical evidence is presented for the formation of this intermediate in the reaction of N-(2,4,6-trisubstituted phenyl)benzimidoyl chlorides with AgNO3.Rearrangement of the O-nitro imidate is unimolecular and intramolecular.The rate of rearrangement is independent of the substituent in the C-aryl ring, but increases with the electon-withdrawing ability of the substituents in the N-aryl ring.A mechanism is proposed in which the imidoyl chloride reacts with AgNO3 to produce first a nitrilium ion which goes on to form an O-nitro imidate that subsequently rearranges via a homolytic cleavage of the O-NO2 bond.The ortho:para ratios of N-(nitroaryl)benzamides obtained in the present work indicate that O-nitro imidates are not responsible for the high 1/2ortho:para ratios sometimes observed in the nitration of anilides.N-Alkylbenzimidoyl chlorides react with AgNO3 to form the corresponding N-nitro- and N-nitrosobenzamides.The mechanism of formation of the N-alkyl-N-nitrobenzamide arises from a pathway analogous to that for N-aryl-N-nitrobenzamides, involving a nitrilium ion that gives rise to an O-nitro imidate.The evidence for the formation of the N-nitrosobenzamide points to an alternative reaction of the imidoyl chloride with AgNO3.One possible mechanism for this reaction is described.
Reaction of N-Nitroso- and N-Nitro-N-alkylamides with Amines
Garcia, Jordi,Gonzalez, Javier,Segura, Ramon,Urpi, Felix,Vilarrasa, Jaume
, p. 3322 - 3327 (2007/10/02)
Several N-nitroso- and N-nitrocarboxamides have been characterized by 1H and 13C NMR spectroscopy.These compounds react with ammonia and aliphatic amines to afford mainly carboxamides of general formula RCONH2, RCONHR', or RCONR'R''.N-Nitrosocarboxamides and aromatic amines give poor yields of RCONHAr; by contrast, N-nitrocarboxamides and aromatic amines lead to RCONHAr in good yields.The higher thermal stability of the N-nitroamides as compared to N-nitrosoamides is advantageous in this connection; nevertheless, the principal advantage of the NNO2 group appears to be that it activates the nucleophilic attack to the carbonyl of the amide function more than the NNO group, as has been demonstrated by competitive experiments.The reaction of N-nitroso- and N-nitro-N-methylsulfonamides with ammonia and diethylamine has been studied as well; whereas N-methyl-N-nitro-p-toluenesulfonamide reacts as N-nitrocarboxamides, transnitration is predominant with N-methyl-N-nitroso-p-toluenesulfonamide.
NEW SYNTHETIC "TRICKS" USING OLD REAGENTS. A MILD METHOD FOR THE CONVERSION OF RCONHR' TO RCONHR''
Garcia, Jordi,Vilarrasa, Jaume
, p. 1127 - 1128 (2007/10/02)
N-Alkyl-N-nitrosoamides, RCON(NO)R'react with primary aliphatic amines (NH2R''), in refluxing dichloromethane or at room temperature, to give RCONHR'' in 65-98percent yields.
