14983-92-7Relevant academic research and scientific papers
Indium-mediated efficient conversion of azides to carbamates
Yadav,Subba Reddy,Kiran Kumar Reddy
, p. 571 - 573 (2000)
A novel and efficient method for the high yield preparation of carbamates by the reaction of azides with several chloroformates using indium metal in DMF at ambient temperature is described for the first time.
Oxidative Route to Indoles via Intramolecular Amino-Hydroxylation of o-Allenyl Anilines
Lauta, Nicholas R.,Williams, Ryan E.,Smith, David T.,Kumirov, Vlad K.,Njardarson, Jon T.
, p. 10713 - 10723 (2021/07/31)
A new intramolecular oxidative amino-hydroxylation of o-allenyl anilines is reported. Treatment of carbamate-protected anilines with lead(IV) carboxylates in dichloromethane at room temperature results in facile tandem C-N (allene cyclization) and C-O bon
Method for synthesizing P-chloroO-toluidine
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Paragraph 0098-0099, (2021/10/05)
The invention discloses a method for synthesizing p-chloroo-toluidine, which comprises the following steps: synthesizing o-toluidine and a protective agent in an organic solvent to obtain an amino-protected intermediate. The amino protected intermediate is added into hydrochloric acid, an oxidant is added for chlorination reaction, and a chlorination product is obtained. The chlorinated product is removed and the amino protecting group is removed to give p-chloroo-toluidine. The method for synthesizing p-chloroo-toluidine provided by the invention is high in yield, simple to operate, less in three wastes, high in product content and good in quality, and can be suitable for industrial mass production.
Copper-Catalyzed Coupling of Amines with Carbazates: An Approach to Carbamates
Wang, Song-Ning,Zhang, Guo-Yu,Shoberu, Adedamola,Zou, Jian-Ping
, p. 9067 - 9075 (2021/07/19)
A new approach for the preparation of carbamatesviathe copper-catalyzed cross-coupling reaction of amines with alkoxycarbonyl radicals generated from carbazates is described. This environmentally friendly protocol takes place under mild conditions and is compatible with a wide range of amines, including aromatic/aliphatic and primary/secondary substrates.
Preparation method of pyridine quinazoline intermediate (by machine translation)
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Paragraph 0011; 0015; 0019; 0023; 0027; 0031, (2020/02/14)
The invention discloses a preparation method of a pyridine quinazoline intermediate, wherein: the 2 - preparation method of the, pyridine quinazoline intermediate comprises, the following steps, of: performing, substitution reaction and 3 - ring-forming r
Methoxycarbonylation of Alkyl-, Cycloalkyl-, and Arylamines with Dimethyl Carbonate in the Presence of Binder-Free Zeolite
Khazipova, A. N.,Khusnutdinov, R. I.,Mayakova, Yu. Yu.,Shchadneva, N. A.
, p. 1228 - 1235 (2020/10/02)
Abstract: Methyl N-alkyl-, N-cycloalkyl-, and N-arylcarbamates were synthesized by reaction of the correspondingamines with dimethyl carbonate in the presence of binder-free FeHY zeolite. Theoptimal conditions (reactant ratio, amount of the catalyst, temperature,reaction time) were found to afford the target products with high yields.
PRODUCTION OF N-SUBSTITUTED AROMATIC HYDROXYLAMINE
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Paragraph 0053, (2020/01/12)
An economic, one-step method for the production of N-substituted aromatic hydroxylamines of formula (I) [in-line-formulae]R—N(OH)—C(═O)—(O)R1??(I),[/in-line-formulae] with hydrogen, by catalytic hydration with possibly modified hydration catalysts in an aprotic solvent and in the presence of a halogen formic acid ester and in some cases in the presence of a base.
Zr-MOF-808@MCM-41 catalyzed phosgene-free synthesis of polyurethane precursors
Rojas-Buzo, Sergio,García-García, Pilar,Corma, Avelino
, p. 146 - 156 (2019/01/10)
In this work, a catalytic method is presented for the synthesis of aromatic carbamates from aromatic amines using dimethyl carbonate instead of phosgene as a green and safe reaction process. Microcrystalline Zr-MOF-808 is reported as an active and efficient heterogeneous catalyst for the selective carbamoylation of anilines and industrially relevant aromatic diamines, under mild reaction conditions with near quantitative yields. We have accomplished the selective growth of well-dispersed Zr-MOF-808 nanocrystals within the mesoporous material MCM-41. A superior catalytic performance of the Zr-MOF-808@MCM-41 is demonstrated that together with increased stability stands out as an advantageous heterogeneous catalyst for polyurethane production. In situ FTIR studies have allowed a better understanding of the reaction pathway at the molecular level when the active MOF catalyst is present.
Electrochemical Hofmann rearrangement mediated by NaBr: Practical access to bioactive carbamates
Li, Lijun,Xue, Mengyu,Yan, Xin,Liu, Wenmin,Xu, Kun,Zhang, Sheng
supporting information, p. 4615 - 4618 (2018/07/06)
An electrochemical Hofmann rearrangement is reported. With the mediation of NaBr, highly corrosive and toxic halogens are avoided. Moreover, this efficient and green approach is well compatible with a broad range of amides, including several commercial medicine derivatives, and provides direct access to synthetically useful carbamates. The synthetic utility of this method is also demonstrated by the preparation of 15N labeling carbamate and gram-scale synthesis of Amantadine.
A PROCESS FOR THE SYNTHESIS OF AROMATIC CARBAMATES
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Page/Page column 13; 14, (2018/12/13)
The present invention discloses a process for the synthesis of aromatic carbamates from amine with dialkyl carbonate in the presence of binary or ternary mixed metal oxide catalyst. The present invention further discloses the yield of said aromatic carbamate in the range of 60 to 99%. Further, the ratio of amine to dialkyl carbonate is in the range of 1:2 to 1:30.
