Tag: M.W=150-200

Prior, S.; Wiegrebe, W. published the artcile< Intramolecular von Braun-reaction: evidence of inversion>, Related Products of 617-55-0, the main research area is von Braun degradation stereochem; cyanogen bromide benzylisoquinoline derivative; ozonolysis phenylisochromane derivative.

(R)-I and BrCN gave II which on ozonolysis gave 1,3-dimethylimidazolidine-2,4,5-trione and (S)-malic acid. The formation of the latter compound proved that inversion occurred in the von Braun degradation of (R)-I.

Scientia Pharmaceutica published new progress about Decomposition, von Braun. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Related Products of 617-55-0.

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

Mayer, Guido; Hinze, Claudia; Polborn, Kurt; Steglich, Wolfgang published the artcile< Unexpected Formation of the Arcyriacyanin System by Condensation of a 3-Bromo-4-(indol-3-yl)maleimide with (2-Nitrophenyl)acetates>, Formula: C9H9NO4, the main research area is arcyriacyanin alkaloid condensation bromoindolylmaleimide nitrophenyl acetate.

The reaction of an N-protected 3-bromo-4-(indol-3-yl)maleimide with Me (2-nitrophenyl)acetates in the presence of base affords condensed cycloheptatriene derivatives which can be transformed into arcyriacyanin-type alkaloid I. The unusual reaction sequence implies a heptatrienyl-cycloheptadienyl anion rearrangement followed by a 1,5-sigmatropic shift to yield the thermodynamically more stable cycloheptatriene derivative

Australian Journal of Chemistry published new progress about Crystal structure. 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Formula: C9H9NO4.

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

Santi, Micol; Ould, Darren M. C.; Wenz, Jan; Soltani, Yashar; Melen, Rebecca L.; Wirth, Thomas published the artcile< Metal-Free Tandem Rearrangement/Lactonization: Access to 3,3-Disubstituted Benzofuran-2-(3H)-ones>, Category: esters-buliding-blocks, the main research area is benzofuranone preparation; diazoester preparation tandem rearrangement lactonization; benzofuranone; boron; diazo compounds; metal-free conditions; rearrangement.

A novel metal-free synthesis of 3,3-disubstituted benzofuran-2-(3H)-ones through reacting α-aryl-α-diazoacetates with triarylboranes is presented. Initially, triarylboranes were successfully investigated in α-arylations of α-diazoacetates, however in the presence of a heteroatom in the ortho position, the boron enolate intermediate undergoes an intramol. rearrangement to form a quaternary center. The intermediate cyclizes to afford valuable 3,3-disubstituted benzofuranones in good yields.

Angewandte Chemie, International Edition published new progress about Arylation. 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Category: esters-buliding-blocks.

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

Munaretto, Laieli S.; dos Santos, Caio Y.; Gallo, Rafael D. C.; Okada, Celso Y. Jr.; Deflon, Victor M.; Jurberg, Igor D. published the artcile< Visible-Light-Mediated Strategies to Assemble Alkyl 2-Carboxylate-2,3,3-Trisubstituted β-Lactams and 5-Alkoxy-2,2,4-Trisubstituted Furan-3(2H)-ones Using Aryldiazoacetates and Aryldiazoketones>, Safety of Methyl 2-(2-nitrophenyl)acetate, the main research area is alkyl carboxylate lactam preparation photochem diastereoselective; alkoxy furanone preparation photochem; aryldiazoacetate aryldiazoketone Wolff rearrangement.

Two new visible-light-mediated strategies are described starting from aryldiazoacetates ArC(R)=N2 (Ar = Ph, 4-chlorophenyl, 3,4-difluorophenyl, etc.; R = CF3, C(O)OMe, C(O)OBn, etc.). The first approach describes their reaction with azides R1N3 (R1 = 2-cyanoethyl, Cy, Ph, etc.) to afford the corresponding imines (Z)-ArC(R)=NR1, and then reaction with aryldiazoketones R2C(O)C(=N2)C6H5 (R2 = Me, Ph, 4-methoxyphenyl), produces alkyl 2-carboxylate-2,3,3-trisubstituted β-lactams I. The second approach describes the reaction with sulfoxides R3S(O)R4 (R3 = Me, n-Bu, Ph, 4-chlorophenyl; R4 = Me, n-Bu, Ph, 4-chlorophenyl; R3R4 = -(CH2)4-) to afford the corresponding sulfoxonium ylides ArC(R)=S(O)(R3)R4, followed by reaction with aryldiazoketones to produce 5-alkoxy-2,2,4-trisubstituted furan-3(2H)-ones II (R5 = Me, i-Pr, Bn). These protocols take advantage of the photolysis of aryldiazoacetates and the photochem. promoted Wolff rearrangement of aryldiazoketones.

Organic Letters published new progress about Azetidines Role: SPN (Synthetic Preparation), PREP (Preparation). 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Safety of Methyl 2-(2-nitrophenyl)acetate.

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

Li, Guangzhe; Shao, Yujie; Pan, Yue; Li, Yueqing; Wang, Yang; Wang, Liu; Wang, Xu; Shao, Kun; Wang, Shisheng; Liu, Naixuan; Zhang, Jingdong; Zhao, Weijie; Nakamura, Hiroyuki published the artcile< Total synthesis and biological evaluation of 7-hydroxyneolamellarin A as hypoxia-inducible factor-1α inhibitor for cancer therapy>, Application of C6H12ClNO4, the main research area is hydroxyneolamellarin antitumor agent HIF alpha inhibitor; 7-Hydroxyneolamellarin A; Anti-tumor; HIF-1α inhibition; Total synthesis.

7-Hydroxyneolamellarin A (7-OH-Neo A, 1), a natural marine product derived from sponge Dendrilla nigra, was first synthesized with 10% overall yield under the instruction of convergent synthetic strategy. We found that 7-Hydroxyneolamellarin A could attenuate the accumulation of hypoxia-inducible factor-1α (HIF-1α) protein and inhibit vascular epidermal growth factor (VEGF) transcriptional activity, showing well inhibitory effect on HIF-1 signaling pathway. Meantime, 7-Hydroxyneolamellarin A had the well anti-tumor activities, such as inhibiting tumor angiogenesis, proliferation, migration and invasion. More importantly, 7-Hydroxyneolamellarin A exhibited profound anti-tumor effect in mice breast cancer model by suppressing the accumulation of HIF-1α in tumor tissue. Mechanism study demonstrated that 7-Hydroxyneolamellarin A might target the protein with the ability of stabilizing HIF-1α in hypoxia. Due to the excellent water solubility, superior anti-tumor activity and good biocompatibility, 7-OH-Neo A shows the promising potential for being exploited as an anti-tumor agent in near future.

Bioorganic & Medicinal Chemistry Letters published new progress about Antitumor agents. 39987-25-2 belongs to class esters-buliding-blocks, and the molecular formula is C6H12ClNO4, Application of C6H12ClNO4.

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

Watanabe, Hidenori; Onoda, Takahiro; Kitahara, Takeshi published the artcile< Tandem intermolecular alkylation-intramolecular Robinson annulation: a novel and stereoselective construction of the octalin skeleton. Expeditious synthesis of (-)-tanabalin>, Application In Synthesis of 60705-25-1, the main research area is tanabalin octalin skeleton preparation; tandem intermol alkylation intramol Robinson annulation.

Tanabalin (I), an insect antifeedant, was synthesized in optically active form employing a known δ-lactone II as the only source of chirality. The key step is a tandem intermol. alkylation-intramol. Robinson annulation to construct the trans-octalin skeleton.

Tetrahedron Letters published new progress about Cyclization (Robinson). 60705-25-1 belongs to class esters-buliding-blocks, and the molecular formula is C7H12O5, Application In Synthesis of 60705-25-1.

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

Feng, Peng-Fei; Kong, Meng-Ya; Yang, Yi-Wei; Su, Ping-Ru; Shan, Chang-Fu; Yang, Xiao-Xi; Cao, Jing; Liu, Wei-Sheng; Feng, Wei; Tang, Yu published the artcile< Eu2+/Eu3+-Based Smart Duplicate Responsive Stimuli and Time-gated Nanohybrid for Optical Recording and Encryption>, Reference of 94-02-0, the main research area is europium smart duplicate responsive stimulus nanohybrid optical recording encryption; duplicato-responsive; in situ coordination; nanohybrid; optical recording and encryption; variable valence europium.

With the rapid development of information science, it is urgent that memory devices possessing high security, d., and desirable storage ability should be developed. A smart duplicate response of stimuli was developed and a time-gate nanohybrid based on variable valence Eu2+/Eu3+ coencapsulated was fabricated and acts as active material in the multilevel and multidimensional memory devices. The luminescence lifetime of Eu3+ in this nanohybrid gave a stimuli response due to which the energy level of the coordinated ligand could be modulated. By a simple sintering procedure, Eu3+ was partially in situ reduced to Eu2+ with a short lifetime in the system. And the in situ reduction ensured both Eu3+ and Eu2+ ions’ uniform distribution in the nanohybrid and simultaneous response upon light excitation of variable valence Eu ions. Eu3+ revealed a prolonged lifetime because of the presence of an energy-transfer effect of Eu2+ → Eu3+. Such a nanohybrid had abundant luminescent properties, including the short lifetime of Eu2+, the energy transfer from the Eu2+ to Eu3+ ions, and the stimuli response of the Eu3+ lifetimes when exposed to acidic or basic vapor, thus giving birth to interesting recording and encryption performance in spatial-temporal dimensions. Probably this research will point out a new direction for the future development of multilevel and multidimensional optical recording and encryption materials.

ACS Applied Materials & Interfaces published new progress about Coded information. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Reference of 94-02-0.

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

Abell, Andrew D.; Martyn, Derek C.; May, Barnaby C. H.; Nabbs, Brent K. published the artcile< An amino acid N-derivatising group that can be colored on demand>, Reference of 7126-50-3, the main research area is colored red amino acid pyrrolizinone solution solid phase synthesis; amino acid formylpyrrolecarboxylic cinnamoyl chloride; peptide pyrrolizinone preparation red colored.

A method is presented whereby an amino acid is reacted with 5-formyl-1H-pyrrole-2-carboxylic acid to give an N-derivatized tag that has a latent ability to be colored. A characteristic red pyrrolizin-3-one (colored tag) is then revealed on treatment with hydrocinnamoyl chloride. This sequence has been carried out on amino acids in solution, and on solid phase, and also on dipeptides.

Tetrahedron Letters published new progress about Amino acids Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 7126-50-3 belongs to class esters-buliding-blocks, and the molecular formula is C8H9NO3, Reference of 7126-50-3.

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

Striegler, Susanne; Fan, Qiu-Hua; Rath, Nigam P. published the artcile< Binuclear copper(II) complexes discriminating epimeric glycosides and α- and β-glycosidic bonds in aqueous solution>, Related Products of 617-55-0, the main research area is crystal mol structure binuclear copper complex; binuclear copper complex preparation enzyme mimetic epimeric glycoside; aryl glycoside chemoselective glycolysis binuclear copper complex enzyme mimetic; disaccharide chemoselective glycolysis binuclear copper complex enzyme mimetic; Catalysis; binuclear copper(II) complexes; chiral; glycosides; selective hydrolysis.

Two chiral binuclear copper(II) complexes were synthesized and characterized for the first time as efficient chemoselective catalysts for the hydrolysis of aryl glycosides and disaccharides in aqueous solution at near neutral pH. Under these conditions, discrimination of epimeric aryl α-glycopyranosides was observed by both 29-fold different reaction rates and 3-fold different proficiency of the catalyst (safety note: perchlorate salts are potentially explosive). Addnl., large differentiation of the nature of α- and β-glycosidic bond in aryl glycosides as model compounds is apparent, but also noted in selected disaccharides. The influence of the chirality of the complexes and the role of the configuration of the carbohydrate upon interaction with the catalyst is discussed in detail. Lastly, a putative mechanism for the metal complex-catalyzed hydrolysis is derived from the exptl. evidence pointing at deprotonation of the hydroxyl group at C-2 as a pre-requisite for glycoside hydrolysis.

Journal of Catalysis published new progress about Bond (glycosidic). 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Related Products of 617-55-0.

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

Zhang, Ying-Qi; Zhang, Yi-Ping; Zheng, Yan-Xin; Li, Zhao-Yang; Ye, Long-Wu published the artcile< Rapid and practical access to diverse quindolines by catalyst-free and regioselectivity-reversed Povarov reaction>, Quality Control of 252932-48-2, the main research area is quindoline preparation regioselective; arylimine dienophile Povarov reaction.

The Povarov reaction, a formal [4 + 2] cycloaddition between N-aryl imines and electron-rich dienophiles, has been defined as an efficient method to approach tetrahydroquinolines and has been well established in the past decades. In general, electron-rich heterosubstituted alkenes have served as the most popular dienophiles to achieve the exclusive regioselectivity. However, the use of Lewis acids and Bronsted acids as catalysts is required in these transformations, and, to authors knowledge, the Povarov reaction of electron-rich heterosubstituted alkynes has not been reported. Here, authors disclose a catalyst-free Povarov reaction of formyl-ynamides with anilines for the rapid and practical synthesis of a diverse range of valuable quindolines, which not only represents the first Povarov reaction of ynamides to the best of authors knowledge but also constitutes a very rare example of a catalyst-free ynamide cyclization reaction. This formal [1 + 2 + 3] annulation shows a reversed regioselectivity compared with the previous protocols.

Cell Reports Physical Science published new progress about [4+2] Cycloaddition reaction. 252932-48-2 belongs to class esters-buliding-blocks, and the molecular formula is C7H10N2O2, Quality Control of 252932-48-2.

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