Month: October 2022

Menzel, Karsten; Dimichele, Lisa; Mills, Paul; Frantz, Doug E.; Nelson, Todd D.; Kress, Michael H. published the artcile< Regioselective halogen-metal exchange reaction of 3-substituted 1,2-dibromo arenes: the synthesis of 2-substituted 5-bromobenzoic acids>, Recommanded Product: 2,3-Dibromobenzoic acid, the main research area is substituted dibromoarene isopropylmagnesium chloride regioselective halogen metal exchange; bromoarene substituted preparation; bromobenzoic acid substituted preparation; regioselective halogen metal exchange reagent isopropylmagnesium chloride.

Regioselective halogen-metal exchange reactions using isopropylmagnesium chloride were carried out on 3-substituted 1,2-dibromo arenes, e.g., I. When the 3-substituent was either electron-withdrawing and/or possessed lone pair electrons that enabled chelation of isopropylmagnesium chloride, a high regioselectivity for the halogen-metal exchange adjacent to the 3-substituents resulted.

Synlett published new progress about Aromatic carboxylic acids Role: SPN (Synthetic Preparation), PREP (Preparation) (bromo-). 603-78-1 belongs to class bromides-buliding-blocks, and the molecular formula is C7H4Br2O2, Recommanded Product: 2,3-Dibromobenzoic acid.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Wu, Xiaoyu; Nie, Linlin; Fang, Huihui; Chen, Jie; Cao, Weiguo; Zhao, Gang published the artcile< Organocatalyzed Cascade Reactions of Cyclic β-Enamino Esters and α,β-Unsaturated Aldehydes Leading to Indoloquinolizidines and Benzoquinolizidines>, Safety of 3-(4-Bromophenyl)acrylaldehyde, the main research area is quinolizidine fused preparation; indoloquinolizidine preparation; benzoquinolizidine preparation; organocatalyst cascade reaction cyclic enamino ester unsaturated aldehyde.

Organocatalyzed cascade reactions between cyclic β-enamino esters and α,β-unsaturated aldehydes have been developed. They provide highly substituted indolo[2,3-a]quinolizidines and benzo[a]quinolizidines in moderate to good yields and with good to excellent enantioselectivities. Both aromatic and aliphatic α,β-unsaturated aldehydes react readily with enamino esters to furnish the desired products. E.g., organocatalyzed reaction of enamino ester (I) with 4-BrC6H4CH:CHCHO gave 77% indolo[2,3-a]quinolizidine (II).

European Journal of Organic Chemistry published new progress about Cyclization (cyclic β-enamino esters). 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, Safety of 3-(4-Bromophenyl)acrylaldehyde.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Kuratsu, Masato; Kozaki, Masatoshi; Okada, Keiji published the artcile< 2,2':6',2'':6'',6-trioxytriphenylamine: Synthesis and properties of the radical cation and neutral species>, Reference of 135999-16-5, the main research area is trioxytriphenylamine synthesis property radical cation mol structure.

A flat radical: Oxygen-bridged triphenylamine 1 and its radical cation 2 were prepared The neutral compound has a shallow bowl structure, whereas the radical cation is planar. The properties of the highly stable radical cation were clarified; such compounds have potential applicability in electronic and magnetic materials.

Angewandte Chemie, International Edition published new progress about Crystal structure. 135999-16-5 belongs to class bromides-buliding-blocks, and the molecular formula is C7H7BrO2, Reference of 135999-16-5.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Wang, Lei; Li, Sun; Chauhan, Pankaj; Hack, Daniel; Philipps, Arne R.; Puttreddy, Rakesh; Rissanen, Kari; Raabe, Gerhard; Enders, Dieter published the artcile< Asymmetric, Three-Component, One-Pot Synthesis of Spiropyrazolones and 2,5-Chromenediones from Aldol Condensation/NHC-Catalyzed Annulation Reactions>, Computed Properties of 3893-18-3, the main research area is pyrazolone enal NHC chiral aldol condensation annulation catalyst; spiropyrazolone stereoselective preparation; diketone cyclic enal NHC chiral aldol condensation annulation catalyst; chromenedione stereoselective preparation; N-heterocyclic carbene; asymmetric synthesis; chromenedione; multicomponent reaction; spiropyrazolone.

A novel one-pot, three-component diastereo- and enantioselective synthesis of spiropyrazolones has been developed involving the aldol condensation of an enal to generate α,β-unsaturated pyrazolones, which react with a second equivalent of enal through an N-heterocyclic carbene (NHC)-catalyzed [3+2] annulation. The desired spirocyclopentane pyrazolones I (R = Ph, 4-MeOC6H4, 2-MeOC6H4, 4-ClC6H4, 4-BrC6H4, 2-furanyl, 3-thienyl, etc.; R1 = t-Bu, Et, 4-MeOC6H4, 2-naphthyl; R2 = Ph, 4-MeOC6H4, 4-BrC6H4, Bn, t-Bu, etc.) are obtained in moderate to good yields and good to excellent stereoselectivities. Alternatively, starting from cyclic 1,3-diketones, 2,5-chromenediones II (R = Ph, 4-MeOC6H4, 4-MeC6H4, 4-ClC6H4, 2-MeOC6H4, etc.; R1= R2= Me, H; R1= H, R2= Ph) are available through [2+4] annulation.

Chemistry – A European Journal published new progress about Aldol condensation. 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, Computed Properties of 3893-18-3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Zhang, Song-Lin; Yu, Ze-Long published the artcile< Divergent synthesis of indoles, oxindoles, isocoumarins and isoquinolinones by general Pd-catalyzed retro-aldol/α-arylation>, Safety of Methyl 2-bromo-5-fluorobenzoate, the main research area is indole oxindole isocoumarin isoquinolinone preparation; aryl halide hydroxy carbonyl retro aldol arylation palladium catalyst.

Divergent synthesis of indoles I (R = H, 6-CH3, 5-F, etc.; R1 = CH3, C6H5), oxindoles II, isocoumarins e.g., III and isoquinolinones IV (R2 = CH3, C6H5) is described in this report by using a general Pd-catalyzed tandem reaction of β-hydroxy carbonyl compounds R3C(O)CH2C(R4)(OH)CH3 (R3 = CH3, C6H5, OCH3CH2; R4 = CH3, C6H5) with aryl halides bearing an ortho-nitro, -ester or -cyano substituent e.g., Me 2-chloropyridine-3-carboxylate. A key retro-aldol/α-arylation reaction is involved that merges classic Pd cross-coupling chem. with novel Pd-promoted retro-aldol C-C activation to produce α-arylated ketones or esters. Subsequent intramol. condensation of the carbonyl with the ortho-synthon gives target heterocycles I, II, e.g., III and IV. The use of common, com. available and cheap substrates and catalyst system adds addnl. synthetic advantages to the conceptual significance.

Organic & Biomolecular Chemistry published new progress about Aryl bromides Role: RCT (Reactant), RACT (Reactant or Reagent). 6942-39-8 belongs to class bromides-buliding-blocks, and the molecular formula is C8H6BrFO2, Safety of Methyl 2-bromo-5-fluorobenzoate.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Xu, Peng; Zhao, Da; Berger, Florian; Hamad, Aboubakr; Rickmeier, Jens; Petzold, Roland; Kondratiuk, Mykhailo; Bohdan, Kostiantyn; Ritter, Tobias published the artcile< Site-Selective Late-Stage Aromatic [18F]Fluorination via Aryl Sulfonium Salts>, Synthetic Route of 2725-82-8, the main research area is aromatic fluorination aryl sulfonium salt; 18F labeling; C−H functionalization; fluorination; late-stage functionalization; radiochemistry.

Site-selective functionalization of C-H bonds in small complex mols. is a long-standing challenge in organic chem. Herein, the authors report a broadly applicable and site-selective aromatic C-H dibenzothiophenylation reaction. The conceptual advantage of this transformation is further demonstrated through the two-step C-H [18F]fluorination of a series of marketed small-mol. drugs.

Angewandte Chemie, International Edition published new progress about Arenesulfonium compounds Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 2725-82-8 belongs to class bromides-buliding-blocks, and the molecular formula is C8H9Br, Synthetic Route of 2725-82-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Zhang, Tiexin; Huang, Xian; Wu, Luling published the artcile< A Facile Synthesis of 2H-Chromenes and 9-Functionalized Phenanthrenes through Reactions between α,β-Unsaturated Compounds and Arynes>, Quality Control of 3893-18-3, the main research area is chromene preparation; phenanthrene preparation; annulation aryne unsaturated compound.

Facile syntheses of 2H-chromenes or 9-functionalized phenanthrenes under mild conditions in moderate to good yields have been developed. They each involve annulations of arynes with α,β-unsaturated compounds bearing different electron-withdrawing groups (EWGs). Depending on the natures of the different EWGs, the reactions proceed by different pathways: enals react with arynes through a tandem [2+2] cycloaddition/thermal electrocyclic ring-opening/6e-electrocyclization sequence to afford 2H-chromenes, whereas acyl-/ethoxycarbonyl-/cyano-substituted styrenes undergo Diels-Alder reactions with arynes followed by aromatization to afford 9-functionalized phenanthrenes. The scope, limitations, regioselectivities and mechanisms have been studied and are discussed in detail.

European Journal of Organic Chemistry published new progress about [2+2] Cycloaddition reaction. 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, Quality Control of 3893-18-3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary