Month: November 2022

In 2019,Chemical Science included an article by Liu, Chengwei; Qin, Zhi-Xin; Ji, Chong-Lei; Hong, Xin; Szostak, Michal. Computed Properties of C9H8O4. The article was titled 《Highly-chemoselective step-down reduction of carboxylic acids to aromatic hydrocarbons via palladium catalysis》. The information in the text is summarized as follows:

The highly selective method for the direct step-down reduction of carboxylic acids RCOOH (biphenyl-4-yl, 1-naphthyl, 1-methyl-1H-indole-3-yl, etc.) to arenes RH, proceeding via well-defined Pd(0)/(II) catalytic cycle was described. The method shows a remarkably broad substrate scope, enabling to direct the classical acyl reduction towards selective decarbonylation by a redox-neutral mechanism. The utility of this reaction is highlighted in the direct defunctionalization of pharmaceuticals and natural products, and further emphasized in a range of traceless processes using removable carboxylic acids under mild, redox-neutral conditions orthogonal to protodecarboxylation. Extensive DFT computations were conducted to demonstrate preferred selectivity for the reversible oxidative addition and indicated that a versatile hydrogen atom transfer (HAT) pathway is operable. The experimental part of the paper was very detailed, including the reaction process of 3-(Methoxycarbonyl)benzoic acid(cas: 1877-71-0Computed Properties of C9H8O4)

3-(Methoxycarbonyl)benzoic acid(cas: 1877-71-0) belongs to esters. They are important in biology, being one of the main classes of lipids and comprising the bulk of animal fats and vegetable oils. They perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market.Computed Properties of C9H8O4

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

In 2022,Chemical Science included an article by Li, Gonglin; Zhang, Yan; Zeng, Hongkun; Feng, Xiaoming; Su, Zhishan; Lin, Lili. Electric Literature of C19H28N2O2. The article was titled 《Water enables diastereodivergency in bispidine-based chiral amine-catalyzed asymmetric Mannich reaction of cyclic N-sulfonyl ketimines with ketones》. The information in the text is summarized as follows:

A diastereodivergent asym. Mannich reaction of cyclic N-sulfonyl ketimines I (R1 = Me, Et, i-Pr, Bn, etc.; R2 = H, 5-OMe, 7-Cl, 6-Me, etc.) with ketones such as cyclohexanone, tert-Bu 4-oxopiperidine-1-carboxylate, thian-4-one, etc. catalyzed by a bispidine-based chiral amine catalyst, in which addnl. water switches the diastereoselectivity efficiently was reported. Synthesis of chiral anti- benzosultams and syn-benzosultams II (X = CH2, O, NCO2t-Bu, etc.) with potential anti-HIV-1 activity is obtained in excellent yields and good to excellent ee values. Control experiments and d. functional theory (DFT) calculations were applied to study the diastereodivergent mechanism, which reveal that the diastereodivergent catalysis should be state-determined, and the water reverses the energies of states to realize the diastereodivergency. The findings are quite new and might inspire more diastereodivergent asym. synthesis. In addition to this study using tert-Butyl 7-benzyl-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate, there are many other studies that have used tert-Butyl 7-benzyl-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate(cas: 227940-71-8Electric Literature of C19H28N2O2) was used in this study.

tert-Butyl 7-benzyl-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate(cas: 227940-71-8) belongs to esters. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. Electric Literature of C19H28N2O2

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

Yanagi, Tomoyuki; Somerville, Rosie J.; Nogi, Keisuke; Martin, Ruben; Yorimitsu, Hideki published an article on February 7 ,2020. The article was titled 《Ni-Catalyzed Carboxylation of C(sp2)-S Bonds with CO2: Evidence for the Multifaceted Role of Zn》, and you may find the article in ACS Catalysis.Reference of 3-(Methoxycarbonyl)benzoic acid The information in the text is summarized as follows:

Nickel-catalyzed reductive carboxylation reactions of aryl electrophiles typically require the use of metallic reducing agents. At present, the prevailing perception is that these serve as both a source of electrons and as a source of Lewis acids that may aid CO2 insertion into the Ni-C bond. Herein, we provide evidence for the in situ formation of organometallic species from the metallic reductant, a step that has either been ruled out or has been unexplored in catalytic carboxylation reactions with metal powder reductants. Specifically, we demonstrate that Zn(0) acts as a reductant and that Zn(II) generates arylzinc species that might play a role in the C(sp2)-S carboxylation of arylsulfonium salts. Overall, the reductive Ni-catalyzed C(sp2)-S carboxylation reaction proceeds under mild conditions in a non-amide solvent, displays a wide substrate scope, and can be applied to the formal para C-H carboxylation of arenes. In the part of experimental materials, we found many familiar compounds, such as 3-(Methoxycarbonyl)benzoic acid(cas: 1877-71-0Reference of 3-(Methoxycarbonyl)benzoic acid)

3-(Methoxycarbonyl)benzoic acid(cas: 1877-71-0) belongs to esters. They are important in biology, being one of the main classes of lipids and comprising the bulk of animal fats and vegetable oils. They perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market.Reference of 3-(Methoxycarbonyl)benzoic acid

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

Yuan, Feipeng; Hou, Zhen-Lin; Pramanick, Pranab K.; Yao, Bo published their research in Organic Letters on December 6 ,2019. The article was titled 《Site-selective modification of α-amino acids and oligopeptides via native amine-directed γ-C(sp3)-H arylation》.COA of Formula: C8H17NO2 The article contains the following contents:

Site-selective modification of chem. and biol. valuable α-amino acids and peptides is of great importance for biochem. study and pharmaceutical development. Few methods based on remote C(sp3)-H functionalization of aliphatic side-chains of peptides has been disclosed in recent years. In this report, we developed a novel approach for γ-C(sp3)-H and γ-/δ-C(sp2)-H arylation of α-amino acids with α-hydrogen by native amine-directed C-H functionalization and further realized the γ-C(sp3)-H arylation of N-terminally unprotected peptides. In the part of experimental materials, we found many familiar compounds, such as Ethyl (2S)-2-amino-3,3-dimethylbutanoate(cas: 69557-34-2COA of Formula: C8H17NO2)

Ethyl (2S)-2-amino-3,3-dimethylbutanoate(cas: 69557-34-2) belongs to esters. Esters are more polar than ethers but less polar than alcohols. COA of Formula: C8H17NO2 They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.

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

In 2003,Ocal, Nuket; Yano, Lovelle M.; Erden, Ihsan published 《Photooxygenation of the C:N bond. A mild new method for oxidative C-C cleavage》.Tetrahedron Letters published the findings.Electric Literature of C4H8O3 The information in the text is summarized as follows:

Upon photooxygenation in the presence of base, α-oximino carbonyl compounds undergo clean oxidative C-C cleavage giving rise to mixtures of esters and acids. The mechanism of these reactions involves some unusual peroxidic intermediates, including a 2,3,5-trioxapentanes.Methyl 3-hydroxypropanoate(cas: 6149-41-3Electric Literature of C4H8O3) was used in this study.

Methyl 3-hydroxypropanoate(cas: 6149-41-3) belongs to esters with low molecular weight are commonly used as fragrances and found in essential oils and pheromones. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Electric Literature of C4H8O3

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

In 2006,Hayashi, Toshio; Inagaki, Takahiro; Itayama, Naohiko; Baba, Hideyuki published 《Selective oxidation of alcohol over supported gold catalysts: methyl glycolate formation from ethylene glycol and methanol》.Catalysis Today published the findings.Application In Synthesis of Methyl 3-hydroxypropanoate The information in the text is summarized as follows:

An one-step selective oxidation of primary alc. to carboxylic ester took place in liquid-phase over nano-gold particles, alone or with other metals, e.g., Bi, La, Pb, supported on metal oxides [Al2O3, TiO2, ZrO2] by mol. oxygen. The oxidation of a mixture of ethylene glycol and methanol produced Me glycolate selectively with a small amount of Me formate. The substrate-selectivity was observed clearly with Au catalyst, but not with a typical Pd or Ru catalyst, which is also capable of catalyzing the oxidative esterification of alc.Methyl 3-hydroxypropanoate(cas: 6149-41-3Application In Synthesis of Methyl 3-hydroxypropanoate) was used in this study.

Methyl 3-hydroxypropanoate(cas: 6149-41-3) belongs to esters with low molecular weight are commonly used as fragrances and found in essential oils and pheromones. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Application In Synthesis of Methyl 3-hydroxypropanoate

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

In 2008,Taarning, Esben; Madsen, Anders Theilgaard; Marchetti, Jorge Mario; Egeblad, Kresten; Christensen, Claus Hviid published 《Oxidation of glycerol and propanediols in methanol over heterogeneous gold catalysts》.Green Chemistry published the findings.Electric Literature of C4H8O3 The information in the text is summarized as follows:

Aerobic oxidation of glycerol over metal oxide supported gold nanoparticles in methanol results in the formation of di-Me mesoxalate in selectivities up to 89% at full conversion. The oxidative esterification takes place in methanol, acting both as solvent and reactant, and in the presence of base. Thus, it constitutes a direct transformation of the glycerol byproduct phase from biodiesel production or from glycerol obtained e.g. by fermentation Au/TiO2 and Au/Fe2O3 was found to have similar catalytic activity, whereas Au/C was inactive. 1,2-Propanediol was oxidized to Me lactate with a selectivity of 72% at full conversion, while 1,3-propanediol yielded Me 3-hydroxypropionate with 90% selectivity at 94% conversion. Me 3-hydroxypropionate can be easily converted into Me acrylate, which is then a green polymer building block.Methyl 3-hydroxypropanoate(cas: 6149-41-3Electric Literature of C4H8O3) was used in this study.

Methyl 3-hydroxypropanoate(cas: 6149-41-3) belongs to esters with low molecular weight are commonly used as fragrances and found in essential oils and pheromones. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Electric Literature of C4H8O3

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

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 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