Month: October 2022

Jary, Walther G.; Baumgartner, Judith published the artcile< Asymmetric dihydroxylation reactions leading to novel chiral ferrocene derivatives>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is Sharpless asym dihydroxylation ferrocenyl alkene; ferrocene chiral dihydroxyalkyl derivative asym preparation; osmium catalyzed asym dihydroxylation ferrocenyl alkene.

Several ferrocenyl alkenes were used as starting materials for asym. dihydroxylation reactions. Although they turned out to be unreactive employing Sharpless’ standard conditions, by systematic variation of the reaction conditions the desired novel ferrocenyl diols could be obtained in good yields and in enantiomeric excesses up to >99%. E.g., (1-propenyl)ferrocene was added to a homogeneous MeCN/H2O solution of K3Fe(CN)6, K2CO3, K2OsO2(OH)4 and (DHQD)2PYR ligand to give 1-[((1S,2R)-cis-1,2-dihydroxy)propyl]ferrocene in 99% yield (97% e.e.).

Tetrahedron: Asymmetry published new progress about Alkenes Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Agnihotri, Harsha; Paramasivam, Mahalingavelar; Palakollu, Veerabhadraiah; Kanvah, Sriram published the artcile< Photoisomerization of Trans Ortho-, Meta-, Para-Nitro Diarylbutadienes: A Case of Regioselectivity>, Electric Literature of 112-63-0, the main research area is nitro diarylbutadiene preparation regioselective photoisomerization fluoroscence crystal structure.

A series of ortho-, meta- and para-substituted trans-nitro aryl (Ph and pyridyl) butadienes have been synthesized and characterized. The effect of substitution and positional selectivity on their fluorescence and photoisomerization were systematically investigated. Among all dienes, meta- and para-nitro phenyl-substituted derivatives exhibit remarkable solvatochromic emission shifts due to intramol. charge transfer. On the other hand, ortho derivatives undergo regioselective isomerization upon photoexcitation in contrast to inefficient isomerization of para and meta nitro-substituted dienes. Single crystal X-ray anal. revealed existence of intramol. hydrogen bonding between the nitro group and the hydrogen of the proximal double bond. This restricts the rotation of the proximal double bond thereby allowing regioselective isomerization. The observations were also supported by NMR spectroscopic studies.

Photochemistry and Photobiology published new progress about Alkadienes Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), RCT (Reactant), SPN (Synthetic Preparation), PROC (Process), RACT (Reactant or Reagent), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.

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

Yamamoto, Shuhei; Yoshikawa, Yutaka; Ueda, Eriko; Yamashita, Tetushi; Kajiwara, Naemi; Sakurai, Hiromu; Kojima, Yoshitane published the artcile< Insulinomimetic activity of zinc (II) complexes with halogenated picolinic acids>, Synthetic Route of 112-63-0, the main research area is antidiabetic zinc complex halogenated picolinic acid.

We prepared six new zinc(II) complexes of halogenated picolinic acids with a Zn(N2O2) coordination mode and evaluated for their insulinomimetic activities by in vitro study. By introducing an electron withdrawing halogen groups into the picolinic acid, we prepared bis(4- or 6-chloro picolinato), bis(4-, 5- or 6-iodo picolinato), and bis(6-bromo picolinato)/zinc(II) complexes (Zn(4cpa)2, Zn(6cpa)2, Zn(4ipa)2, Zn(5ipa)2, Zn(6ipa)2, and Zn(6bpa)2, resp.). By in vitro evaluation of the inhibition of free fatty acid (FFA) release from isolated rat adipocytes in the presence of epinephrine, the insulinomimetic activities of Zn(4cpa)2, Zn(6cpa)2, Zn(4ipa)2, Zn(6ipa)2, and Zn(6bpa)2 (IC50 = 0.64, 0.60, 0.77, 0.85, and 0.50 mM, resp.) were higher than that of bis(picolinato)/zinc(II) complex (Zn(pic)2) (IC50 = 1.00 mM) in terms of IC50 value, the 50% inhibition concentrations for the FFA release from rat adipocytes.

Biomedical Research on Trace Elements published new progress about Antidiabetic agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Synthetic Route of 112-63-0.

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

Fang, Jie; Hu, Qiang; Dong, Wan-Li; Xu, Guo-Qiang; Hu, Xiu-Qin; Luo, Yong-Chun; Xu, Peng-Fei published the artcile< Photoredox-catalyzed hydrocarboxymethylation of alkenes>, Electric Literature of 151259-38-0, the main research area is alkene photoredox catalyzed hydrocarboxymethylation.

Direct introduction of a carboxyl group into mols. is one of the most useful methods for the preparation of carboxylic acids, which avoids the conversion of various preexisting functional groups and features good step- and atom-economy. However, the methods for the direct synthesis of two-carbon added carboxylic acids from the precursors remain rare. Herein, we first report a general and mild method for the direct synthesis of a range of aliphatic acids by photoredox-catalyzed hydrocarboxymethylation of alkenes with good toleration of various functional groups in which bromoacetic acid is utilized as an ideal two-carbon synthon. The synthetic utility of this hydrocarboxymethylation protocol is further demonstrated by the concise synthesis of two marketed drugs, sensipar and tirofiban, from com. available starting materials.

CCS Chemistry published new progress about Alkenes Role: TEM (Technical or Engineered Material Use), USES (Uses). 151259-38-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H19NO2, Electric Literature of 151259-38-0.

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

Prevost, Michel; Dostie, Starr; Waltz, Marie-Eve; Guindon, Yvan published the artcile< Investigation of diastereoselective acyclic α-alkoxydithioacetal substitutions involving thiacarbenium intermediates>, Computed Properties of 617-55-0, the main research area is diastereoselective acyclic alkoxydithioacetal substitution thiacarbenium intermediate.

Reported herein is an exptl. and theor. study that elucidates why silylated nucleobase additions to acyclic α-alkoxythiacarbenium intermediates proceed with high 1,2-syn stereocontrol (anti-Felkin-Anh), which is opposite to what would be expected with corresponding activated aldehydes. The acyclic thioaminals formed undergo intramol. cyclizations to provide nucleoside analogs with anticancer and antiviral properties. The factors influencing the selectivity of the substitution reaction have been examined thoroughly. Halothioether species initially form, ionize in the presence (low dielec. media) or absence (higher dielec. media) of the nucleophile, and react through SN2-like transition structures (TS A and D), where the α-alkoxy group is gauche to the thioether moiety. An important, and perhaps counterintuitive, observation in this work was that calculations done in the gas phase or low dielec. media (toluene) are essential to locate the product- and rate-determining transition structures (C-N bond formation) that allow the most reasonable prediction of selectivity and isotope effects for more polar solvents (THF, MeCN). The ΔΔG (GTSA-TSD) obtained in silico are consistent with the preferential formation of 1,2-syn product and with the trends of stereocontrol displayed by 2,3-anti and 2,3-syn α,β-bis-alkoxydithioacetals.

Journal of Organic Chemistry published new progress about Chiral induction. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Computed Properties of 617-55-0.

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

Hao, Lin; Chen, Shaojin; Xu, Jianfeng; Tiwari, Bhoopendra; Fu, Zhenqian; Li, Tong; Lim, Jieyan; Chi, Yonggui Robin published the artcile< Organocatalytic Activation of Alkylacetic Esters as Enolate Precursors to React with α,β-Unsaturated Imines>, HPLC of Formula: 112-63-0, the main research area is enantioselective organocatalytic NHC catalyzed cycloaddition unsaturated imine alkanoate enolate.

Asym. functionalization of alkylacetic esters and their derivatives is traditionally achieved via preformed enolates with chiral auxiliaries. Catalytic versions of such transformations are attractive but challenging. A direct catalytic activation of simple alkylacetic esters via N-heterocyclic carbene organocatalysts to generate chiral enolate intermediates for highly enantioselective reactions is reported. E.g., chiral NHC-catalyzed cycloaddition of PhCH:CHC(:NTs)Ph with 4-nitrophenyl butanoate in presence of DBU afforded trans-lactam I as the major diastereomer in 99% ee.

Organic Letters published new progress about Carboxylic esters Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, HPLC of Formula: 112-63-0.

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

Lee, Suji; Sung, Dan-Bi; Kang, Seungyoon; Parameswaran, Saravanan; Choi, Jun-Ho; Lee, Jong Seok; Han, Min Su published the artcile< Development of human serum albumin selective fluorescent probe using thieno[3,2-b]pyridine-5(4H)-one fluorophore derivatives>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is human serum albumin thienopyridine one fluorophore fluorescent probe; fluorescent probe; human serum albumin; intramolecular charge transfer; microalbuminuria; thieno[3,2-b]pyridine-5(4H)-one.

The level of human serum albumin (HSA) in biol. fluids is a key health indicator and its quant. determination has great clin. importance. In this study, we developed a selective and sensitive fluorescent HSA probe by fluorescence-based high-throughput screening of a set of fluorescent thieno[3,2-b]pyridine-5(4H)-one derivatives against major plasma proteins: HSA, bovine serum albumin (BSA), globulin, fibrinogen, and transferrin. The fluorophore chosen finally (4) showed noticeable fluorescence enhancement in the presence of HSA (160-fold increase), and it exhibited rapid response, high sensitivity (detection limit 8 nM), and the ability to clearly distinguish HSA from BSA in pH 9 buffer condition. Moreover, the probe could be applicable to detect trace amounts of HSA in an artificial urine sample; further, it might be applied to the determination of the HSA concentration in complex biol. samples for pre-clin. diagnosis.

Sensors published new progress about Blood plasma. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Cai, Qian; Li, Zhengqiu; Wei, Jiajia; Ha, Chengyong; Pei, Duanqing; Ding, Ke published the artcile< Assembly of indole-2-carboxylic acid esters through a ligand-free copper-catalyzed cascade process>, Computed Properties of 112-63-0, the main research area is indole carboxylic ester preparation; copper catalyzed condensation coupling deformylation halo aldehyde ketone isocyanoacetate.

A straightforward synthesis of indole-2-carboxylic esters was developed through a ligand-free copper-catalyzed condensation/coupling/deformylation cascade process from 2-halo aryl aldehydes or ketones with Et isocyanoacetate. The reactions proceeded well for most of the 2-iodo-, bromo-, and chloro-substrates under room temperature or mild conditions.

Chemical Communications (Cambridge, United Kingdom) published new progress about Aryl aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent) (halo). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Computed Properties of 112-63-0.

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

Wenkert, Ernest; Sprague, P. W.; Webb, R. L. published the artcile< General methods of synthesis of indole alkaloids. XII. Synthesis of dl-18,19-dihydroantirhine and methyl demethylilludinate>, Recommanded Product: Methyl 4-methylnicotinate, the main research area is indole alkaloid; illudinininate demethyl; antirhine dihydro; pyridine alkaloid; demethylilludinininate methyl; dihydroantirhine.

Methyl nicotinate I (R = R1 = H) was condensed with MeCHO to give I (RR1 = MeCH:) and with 3,3-dimethylcyclopentanone to give I, (RR1 = 3,3-dimethylcyclopentylidene). Reduction, and oxidation of the I (RR1 = MeCH:) led to lactone II and thence in 3 steps to an antirhine derivative (±)III. Esterification and cyclization of I (RR1 = 3,3-dimethylcyclopentylidene) afforded an illudinine derivative IV.

Journal of Organic Chemistry published new progress about Alkaloids. 33402-75-4 belongs to class esters-buliding-blocks, and the molecular formula is C8H9NO2, Recommanded Product: Methyl 4-methylnicotinate.

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

Otevrel, Jan; Svestka, David; Bobal, Pavel published the artcile< Bianthryl-based organocatalysts for the asymmetric Henry reaction of fluoroketones>, COA of Formula: C19H34O2, the main research area is alc preparation enantioselective; fluoroketone nitroalkane Henry reaction bianthryl catalyst; bianthryl organocatalyst preparation.

A catalytic system based on bianthrylbis(thiourea), e.g., I for the asym. Henry reaction of fluoroketones R1C(O)C(F2)R2 (R1 = Ph, thiophen-2-yl, 3-nitrophenyl, etc.; R2 = H, F) and nitroalkanes R3CH2NO2 (R3 = H, Me) that resulted from the screening of a library containing 31 chiral non-racemic organocatalysts has been developed. The corresponding adducts R1C(OH)(C(F2)R2)CH(NO2)R3 were isolated in up to 6 times shorter reaction time in comparison with the previously published organocatalysts. High levels of stereocontrol have been generally observed, with measured product enantiomeric excesses up to 97% and diastereomeric ratio 3 : 2 (anti/syn). The above-mentioned catalysts have been successfully applied to the total asym. synthesis of CF3-tethered (S)-halostachine, which has proved that this method constitutes an easy entry to similar enantiopure compounds

Organic & Biomolecular Chemistry published new progress about Enantioselective synthesis. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.

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