26654-39-7Relevant articles and documents
LOW TOXICITY NMP SUBSTITUTES AND USES THEREOF
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Paragraph 0150, (2021/08/20)
The present technology is directed to compounds Formulas I, II, III, and IV as well as compositions that include one or more of the compounds and methods of making the compounds. In particular, the present compounds may be used as a replacement for NMP in compositions to produce lower toxicity compositions.
Scalable Synthesis of Esp and Rhodium(II) Carboxylates from Acetylacetone and RhCl3· xH2O
Martínez-Castro, Elisa,Mendoza, Abraham,Suárez-Pantiga, Samuel
supporting information, p. 1207 - 1212 (2020/07/15)
Rhodium(II) carboxylates are privileged catalysts for the most challenging carbene-, nitrene-, and oxo-transfer reactions. In this work, we address the strategic challenges of current organic and inorganic synthesis methods to access these rhodium(II) complexes through an oxidative rearrangement strategy and a reductive ligation reaction. These studies illustrate the multiple benefits of oxidative rearrangement in the process-scale synthesis of congested carboxylates over nitrile anion alkylation reactions, and the impressive effect of inorganic additives in the reductive ligation of rhodium(III) salts.
Photocatalytic Intramolecular C-H Amination Using N-Oxyureas as Nitrene Precursors
Ivanovich, Ryan A.,Polat, Dilan E.,Beauchemin, André M.
supporting information, p. 6360 - 6364 (2020/09/02)
Nitrenes are remarkable high-energy chemical species that enable direct C-N bond formation, typically via controlled reactions of metal-stabilized nitrenes. Here, in contrast, the combined use of photocatalysis with careful engineering of the precursor enabled C-H amination forming imidazolidinones and related nitrogen heterocycles from readily accessible hydroxylamine precursors. Preliminary mechanistic results are consistent with the formation of free carbamoyl triplet nitrenes as reactive intermediates.
Versatile Cp*Co(III)(LX) Catalyst System for Selective Intramolecular C-H Amidation Reactions
Chang, Sukbok,Jung, Hoimin,Kim, Dongwook,Lee, Jeonghyo,Lee, Jia,Park, Juhyeon
supporting information, p. 12324 - 12332 (2020/08/06)
Herein, we report the development of a tailored cobalt catalyst system of Cp*Co(III)(LX) toward intramolecular C-H nitrene insertion of azidoformates to afford cyclic carbamates. The cobalt complexes were easy to prepare and bench-stable, thus offering a convenient reaction protocol. The catalytic reactivity was significantly improved by the electronic tuning of the bidentate LX ligands, and the observed regioselectivity was rationalized by the conformational analysis and DFT calculations of the transition states. The superior performance of the newly developed cobalt catalyst system could be broadly applied to both C(sp2)-H and C(sp3)-H carbamation reactions under mild conditions.
Tuning Triplet Energy Transfer of Hydroxamates as the Nitrene Precursor for Intramolecular C(sp3)-H Amidation
Chang, Sukbok,Jung, Hoimin,Keum, Hyeyun,Kweon, Jeonguk
supporting information, p. 5811 - 5818 (2020/04/10)
Reported herein is the design of a photosensitization strategy to generate triplet nitrenes and its applicability for the intramolecular C-H amidation reactions. Substrate optimization by tuning physical organic parameters according to the proposed energy transfer pathway led us to identify hydroxamates as a convenient nitrene precursor. While more classical nitrene sources, representatively organic azides, were ineffective under the current photosensitization conditions, hydroxamates, which are readily available from alcohols or carboxylic acids, are highly efficient in accessing synthetically valuable 2-oxazolidinones and γ-lactams by visible light. Mechanism studies supported our working hypothesis that the energy transfer path is mainly operative.
A synthetic penem antibiotics of hand natural auxiliary base preparation method
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Paragraph 014; 0017; 0019, (2019/07/04)
The present invention relates to the field of medicinal chemistry for the preparation of the product, in particular to a synthetic penem antibiotics of hand natural auxiliary base preparation method. The synthetic penem antibiotics of hand natural auxilia
Irbinitinib intermediates for preparation of (by machine translation)
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Paragraph 0076; 0077; 0078; 0100; 0101; 0102, (2019/07/10)
The invention belongs to the organic synthesis and bulk drug preparation technology field, in particular to the treatment of breast cancer drug Irbinitinib preparation method and intermediate, comprising the steps of: 2 - methyl - 4 - nitro-phenol (formul
Safe synthesis of alkylhydroxy and alkylamino nitramines
Antonsen, Simen,Aursnes, Marius,Gallantree-Smith, Harrison,Dye, Christian,Stenstr?m, Yngve
, (2016/12/30)
Three different protocols for the syntheses of hydroxyalkylnitramines are presented and compared. Safety issues regarding the synthesis of nitramines are also discussed.
Aluminium-Catalysed Oxazolidinone Synthesis and their Conversion into Functional Non-Symmetrical Ureas
Laserna, Victor,Guo, Wusheng,Kleij, Arjan W.
, p. 2849 - 2854 (2015/09/28)
An efficient and practical aluminium-catalysed approach towards a range of functional oxazolidinones is reported. The method is based on cheap and readily available starting materials including terminal and internal (bicyclic) epoxides and phenyl carbamate. The oxazolidinones serve as highly useful synthons for the high yield preparation of non-symmetrical ureas by nucleophilic ring-opening affording the targeted urea compounds with excellent functional group diversity, high regioselectivity and isolated yields up to >99%.
PROCESS FOR THE PREPARATION OF N-IODOAMIDES
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Paragraph 00121-00122, (2015/05/26)
The present invention provides new stable crystalline N-iodoamides - 1-iodo- 3,5,5-trimethylhydantoin (1-ITMH) and 3-iodo-4,4-dimethyl-2-oxazolidinone (IDMO). The present invention further provides a process for the preparation of organic iodides using N-iodoamides of this invention and recovery of the amide co-products from waste water.