Tag: 100-200

Chen, Cheng; Xuan, Yang; Chen, Qi; Ni, Guo-Wei; Pan, Jiang; Xu, Jian-He published their research in Molecular Catalysis in 2021. The article was titled 《Asymmetric reduction of 2-chloro-3-oxo-ester into enantiomerically high pure diltiazem precursor by a Candida ketoreductase》.Category: esters-buliding-blocks The article contains the following contents:

Me (2R,3S)-3-(4-methoxyphenyl)glycidate [(2R,3S)-MPGM] is an advanced chiral synthon for the synthesis of the cardiovascular drug diltiazem. It can be easily accessed by cyclizing the reduction products of Me 2-chloro-3-(4-methoxyphenyl)-3-oxo-propanoate. Herein, we report an identified carbonyl reductase (CpKR) from Candida parapsilosis that displayed an excellent stereoselectivity toward the keto substituent at the C3-position of the 2-chloro-3-oxo-ester. The engineered Escherichia coli cells harboring CpKR gene were directly applied for the asym. reduction of keto ester 1a with a space-time yield of 46 g L-1 d-1, which represents the highest productivity in bio-reduction reported so far. The isolated chiral alc. products were then applied to the chem. synthesis of (2R,3S)-MPGM in 99% ee and a total yield of 76% in the two-step chemo-enzymic reactions, which far exceeded the maximum theor. yield (50%) of the existing industrial process based on a lipase-catalyzed resolution of racemic MPGM. This work provides a promising eco-friendly and cost-effective route toward industrial synthesis of pharmaceutically relevant diltiazem. In the experiment, the researchers used many compounds, for example, Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3Category: esters-buliding-blocks)

Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3) belongs to ketone compounds. Ketones are highly reactive, although less so than aldehydes, to which they are closely related. Much of their chemical activity results from the nature of the carbonyl group. Ketones readily undergo a wide variety of chemical reactions.Category: esters-buliding-blocks

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

《Catalytic 1,2-Rearrangements: Organocatalyzed Michael/Semi-Pinacol-like Rearrangement Cascade of 1,3-Diones and Nitroolefins》 was written by Jao, Tsung-Jung; Akula, Pavan Sudheer; Hong, Bor-Cherng; Lee, Gene-Hsiang. COA of Formula: C7H12O3 And the article was included in Organic Letters in 2020. The article conveys some information:

New types of organocatalytic 1,2-rearrangements, which resemble the Smiles-like or semi-pinacol-like rearrangement, of Michael adducts of 1,3-dicarbonyl-2-alkyl compounds and nitroalkenes have been realized. Unlike the well-known conjugate addition, the reaction affords the 1-phenyl-1-nitroalkanes via unprecedented rearrangement and cascade reactions. Structures of the appropriate products were unambiguously characterized by X-ray crystallog. In the experiment, the researchers used Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3COA of Formula: C7H12O3)

Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3) belongs to ketone compounds. They are most widely used as solvents, especially in industries manufacturing explosives, lacquers, paints, and textiles. Ketones are also used in tanning, as preservatives, and in hydraulic fluids.COA of Formula: C7H12O3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

《Ruthenium(II)-Catalyzed Ortho-C-H Alkylation of Naphthylamines with Diazo Compounds for Synthesis of 2,2-Disubstituted π-Extended 3-Oxindoles in Water》 was written by Wang, Xiaogang; Zhang, Jin; He, Yuan; Chen, Di; Wang, Chao; Yang, Fangzhou; Wang, Weitao; Ma, Yangmin; Szostak, Michal. Recommanded Product: 4949-44-4 And the article was included in Organic Letters in 2020. The article conveys some information:

Ruthenium(II)-catalyzed ortho-C-H alkylation of naphthylamines with diazo compounds for the synthesis of 2,2-disubstituted π-extended 3-oxindoles has been developed. The method represents the first example of C-H alkylation via carbenoid insertion in water as a sustainable solvent. The procedure includes an inexpensive ruthenium catalyst as well as aqueous media and results in the release of benign N2. The π-extended 3-oxindole products exhibit favorable antitumor properties and remarkable fluorescent properties in aqueous solution for fluorescent imaging. In the part of experimental materials, we found many familiar compounds, such as Ethyl 3-oxopentanoate(cas: 4949-44-4Recommanded Product: 4949-44-4)

Ethyl 3-oxopentanoate(cas: 4949-44-4) belongs to ketone compounds. They are most widely used as solvents, especially in industries manufacturing explosives, lacquers, paints, and textiles. Ketones are also used in tanning, as preservatives, and in hydraulic fluids.Recommanded Product: 4949-44-4

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

《Programmed Sequential Additions to Halogenated Mucononitriles》 was written by Zahara, Adam J.; Hinds, Elsa M.; Nguyen, Andrew L.; Wilkerson-Hill, Sidney M.. SDS of cas: 609-08-5 And the article was included in Organic Letters in 2020. The article conveys some information:

Dihalomucononitriles were synthesized and their reactivity evaluated to assess their ability to function as linchpin reagents. Bis(2-chloroacrylonitrile) and bis(2-bromoacrylonitrile) were synthesized from 2,1,3-benzothiadiazole and undergo conjugate addition/elimination reactions with both nitrogen (40-95% yield) and carbon nucleophiles (72-93% yield). Secondary amines undergo monosubstitutions, while carbon nucleophiles are added twice. The sequence of addition of the nucleophiles could be controlled to give mixed addition products. The multicomponent coupling products could then be converted to natural product like motifs using intramol. cyclization reactions. In the experimental materials used by the author, we found Diethyl 2-methylmalonate(cas: 609-08-5SDS of cas: 609-08-5)

Diethyl 2-methylmalonate(cas: 609-08-5) belongs to aliphatic hydrocarbons. Aliphatic hydrocarbons belong to the most abundant fraction in crude oil. Aliphatics molecules are linear or branched open-chain structures such as n-alkanes, isoalkanes, cycloalkanes (naphthenes), terpenes and steranes.SDS of cas: 609-08-5

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

《Methods for the Synthesis of Piperazine Derivatives Containing a Chiral Bi-2-naphthyl Moiety》 was published in Synthesis in 2020. These research results belong to Periasamy, Mariappan; Venkanna, Boda; Nagaraju, Miriyala; Mohan, Lakavathu. COA of Formula: C4H5ClO3 The article mentions the following:

Piperazine derivatives containing 1,1′-bi-2-naphthyl moiety were synthesized starting from 2,2′-dimethoxy-1,1′-bi-naphthalene via acylation using Et chlorooxoacetate and subsequent condensation with 1,2-diamines followed by reduction of the corresponding dihydro-2-piperazinone intermediate using the NaBH4/I2 reagent system. The corresponding chiral piperazine derivatives containing bi-2-naphthyl moiety was synthesized by asym. reduction of Et dimethoxy-bi-2-naphthyloxoacetate by chiral oxazoborolidine catalyst prepared in-situ using S-diphenylprolinol (S-DPP), B(OCH3)3 and H3B·THF. The resulting diols were mesylated and cyclized using 1,2-diamines to obtain the corresponding chiral piperazine derivatives The experimental process involved the reaction of Ethyl oxalyl monochloride(cas: 4755-77-5COA of Formula: C4H5ClO3)

Ethyl oxalyl monochloride(cas: 4755-77-5) belongs to acyl chlorides. In the laboratory, acyl chlorides are generally prepared by treating carboxylic acids with thionyl chloride (SOCl2). The reaction is catalyzed by dimethylformamide and other additives.COA of Formula: C4H5ClO3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

《Enantioselective α-Amination of Acyclic 1,3-Dicarbonyls Catalyzed by N-Heterocyclic Carbene》 was published in Organic Letters in 2020. These research results belong to Santra, Surojit; Maji, Ujjwal; Guin, Joyram. Quality Control of Diethyl 2-methylmalonate The article mentions the following:

Herein, we describe a method for the catalytic enantioselective α-amination of α-substituted acyclic 1,3-ketoamides and 1,3-amidoesters that affords the products possessing N-substituted quaternary stereocenters with a chiral N-heterocyclic carbene (NHC). The reaction is based on the utilization of an intrinsic Bronsted base characteristic of NHC that enables the catalytic formation of a chiral ion pair comprising the enolate and the azolium ion. A series of challenging open-chain α-substituted 1,3-dicarbonyls are aminated via this method with ee’s of ≤99%. The experimental process involved the reaction of Diethyl 2-methylmalonate(cas: 609-08-5Quality Control of Diethyl 2-methylmalonate)

Diethyl 2-methylmalonate(cas: 609-08-5) belongs to aliphatic hydrocarbons. Aliphatic hydrocarbons belong to the most abundant fraction in crude oil. Aliphatics molecules are linear or branched open-chain structures such as n-alkanes, isoalkanes, cycloalkanes (naphthenes), terpenes and steranes.Quality Control of Diethyl 2-methylmalonate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

In 2019,ACS Catalysis included an article by Agasti, Soumitra; Mondal, Bhaskar; Achar, Tapas Kumar; Sinha, Soumya Kumar; Sarala Suseelan, Anjana; Szabo, Kalman J.; Schoenebeck, Franziska; Maiti, Debabrata. Synthetic Route of C10H10O2. The article was titled 《Orthogonal Selectivity in C-H Olefination: Synthesis of Branched Vinylarene with Unactivated Aliphatic Substitution》. The information in the text is summarized as follows:

Oxidative coupling is a useful tool to synthesize vinylarenes. Despite remarkable successes in linear vinylarene, branched vinylarene synthesis has remained underdeveloped. Overcoming this limitation, herein, we report a chelation-assisted oxidative coupling to generate branched olefinated product in high yield. Exclusive branched selectivity was obtained using alkenyl carboxylic acid. Detailed exptl. studies combined with computational investigations suggest that β-migratory insertion, followed by a decarboxylation pathway is operative for the overall transformation. The experimental process involved the reaction of Benzyl acrylate(cas: 2495-35-4Synthetic Route of C10H10O2)

Benzyl acrylate(cas: 2495-35-4) has been used in preparation of high refractive index polyacrylates. Benzyl acrylate is used in the preparation of heptanoic acid benzyl ester. It is used to prepare polybenzylacrylate using azobisisobutyronitrile as initiator.Synthetic Route of C10H10O2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

In 2019,Organic Letters included an article by Feng, Fang-Fang; Li, Shen; Cheung, Chi Wai; Ma, Jun-An. Application In Synthesis of tert-Butyl carbamate. The article was titled 《Chiral β-Keto Propargylamine Synthesis via Enantioselective Mannich Reaction of Enamides with C-Alkynyl N-Boc N,O-Acetals》. The information in the text is summarized as follows:

Propargylamines are an important class of compounds in organic synthesis and drug discovery, yet the synthesis of chiral β-keto propargylamines remains underdeveloped. Herein, the authors describe a streamlined and general enantioselective Mannich reaction of enamides with C-alkynyl N-Boc N,O-acetals, which serve as readily available C-alkynyl imine precursors, to access a broad range of chiral β-keto N-Boc-propargylamines bearing single stereogenic centers in high yields (up to 98%) and in high enantioselectivities (up to 95% ee). The experimental process involved the reaction of tert-Butyl carbamate(cas: 4248-19-5Application In Synthesis of tert-Butyl carbamate)

tert-Butyl carbamate(cas: 4248-19-5) belongs to anime. The reaction of alkyl halides, R―X, where X is a halogen, or analogous reagents with ammonia (or amines) is useful with certain compounds. Not all alkyl halides are effective reagents; the reaction is sluggish with secondary alkyl groups and fails with tertiary ones. Its usefulness is largely confined to primary alkyl halides (those having two hydrogen atoms on the reacting site).Application In Synthesis of tert-Butyl carbamate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

In 2019,Organic Letters included an article by Yasumoto, Kento; Kano, Taichi; Maruoka, Keiji. SDS of cas: 4248-19-5. The article was titled 《One-Pot Synthesis of Less Accessible N-Boc-Propargylic Amines through BF3-Catalyzed Alkynylation and Allylation Using Boronic Esters》. The information in the text is summarized as follows:

Alkynyl and alkenyl N-Boc propargylamines such as I (R = Ph, 4-MeOC6H4, 4-BrC6H4, 4-MeO2CC6H4, Bu, cyclohexyl, Me3Si) were prepared by alkynylation or allylation of N-Boc alkynyl aldimines (generated in situ from alkynals and BocNH2 or from N,N’-di-Boc aminals) with alkynyl or allyl diisopropylborates in the presence of BF3·Et2O at ambient temperature in CH2Cl2. The method allows N-Boc-propargylic amines to be obtained that are difficult to prepare by other methods. In the experimental materials used by the author, we found tert-Butyl carbamate(cas: 4248-19-5SDS of cas: 4248-19-5)

tert-Butyl carbamate(cas: 4248-19-5) belongs to anime. Nitrous acid converts secondary amines (aliphatic or aromatic) to N-nitroso compounds (nitrosamines): R2NH + HNO2 → R2N―NO. Some nitrosamines are potent cancer-inducing substances, and their possible formation is a serious consideration when nitrites, which are salts of nitrous acid, are present in foods or pharmaceutical preparations. Tertiary amines give rise to nitrosamines more slowly; an alkyl group is eliminated as an aldehyde or ketone, along with nitrous oxide, N2O.SDS of cas: 4248-19-5

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

In 2010,Dietrich, Silvia Anthoine; Riediker, Linda; Gertsch, Jurg; Altmann, Karl-Heinz published 《Synthesis and biological activity of new functionalized epothilones for prodrug design and tumor targeting》.Chimia published the findings.COA of Formula: C8H6FNO4 The information in the text is summarized as follows:

Epothilones are potent antiproliferative agents, which have served as successful lead structures for anticancer drug discovery. However, their therapeutic efficacy would benefit greatly from an increase in their selectivity for tumor cells, which may be achieved through conjugation with a tumor-targeting moiety. Three novel epothilone analogs bearing variously functionalized benzimidazole side chains were synthesized using a strategy based on palladium-mediated coupling and macrolactonization. The synthesis of these compounds is described and their in vitro biol. activity is discussed with respect to their interactions with the tubulin/microtubule system and the inhibition of human cancer cell proliferation. The addnl. functional groups may be used to synthesize conjugates of epothilone derivatives with a variety of tumor-targeting moieties. In the part of experimental materials, we found many familiar compounds, such as Methyl 4-fluoro-3-nitrobenzoate(cas: 329-59-9COA of Formula: C8H6FNO4)

Methyl 4-fluoro-3-nitrobenzoate(cas: 329-59-9) belongs to methyl benzoate. Methyl benzoate reacts at both the ring and the ester, depending on the substrate. Electrophiles attack the ring, illustrated by acid-catalysed nitration with nitric acid to give methyl 3-nitrobenzoate.COA of Formula: C8H6FNO4Methyl 4-fluoro-3-nitrobenzoate is used to prepare dimethyl 3-nitro-3′,4-oxydibenzoate by reacting with 3-hydroxy-benzoic acid methyl ester.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics