Category: bromides-buliding-blocks

Han, Liuqing; Li, Ke; Xu, Haitong; Mei, Tao; Sun, Yali; Qu, Jingping; Song, Yuming published the artcile< N-TFA-Gly-Bt-Based Stereoselective Synthesis of Substituted 3-Amino Tetrahydro-2H-pyran-2-ones via an Organocatalyzed Cascade Process>, COA of Formula: C9H7BrO, the main research area is organocatalyst cascade unsaturated aldehyde trifluoroacetamidoacetylbenzotriazole; stereoselective synthesis aminotetrahydropyranone.

Chiral-substituted 3-amino tetrahydro-2H-pyran-2-ones were prepared in excellent enantioselectivities (up to 99% ee) via an organo-catalyzed cascade procedure with N-TFA-Gly-Bt and α,β-unsaturated aldehydes as the substrates. The corresponding tetrahydro-2H-pyran-2-ones can be used for further synthetic transformations that furnish chiral-substituted 3-aminopiperidin-2-ones with high levels of stereoselectivity.

Journal of Organic Chemistry published new progress about Diastereoselective synthesis. 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, COA of Formula: C9H7BrO.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Shang, Le-Le; Feng, Yun; Gao, Xing-Lian; Chen, Zi-Ren; Xia, Yu; Jin, Wei-Wei; Liu, Chen-Jiang published the artcile< DMAP-Catalyzed C-N Bond formation for Diverse synthesis of Imidazo[1,2-a]pyrimidine and Pyrimido[1,2-a]benzimidazole Derivatives.>, Synthetic Route of 3893-18-3, the main research area is haloalkenyl carbonyl compound aminobenzimidazole DMAP catalyst cyclocondensation reaction; imidazopyrimidine preparation green chem; aminoimidazole haloalkenyl carbonyl compound DMAP catalyst cyclocondensation reaction; pyrimidobenzimidazole preparation green chem.

A DMAP (2-dimethylaminopyridine)-catalyzed condensation reactions for the successful direct construction of pyrimido[1,2-a]benzimidazole or imidazo[1,2-a]pyrimidine was developed. The method utilized readily available α-bromocinnamaldehydes with 2-aminobenzimidazole or 2-aminoimidazole as starting materials in the presence of 2-DMAP/TBHP. In the process, two C-N bonds were successfully constructed to synthesize target compounds

Chinese Journal of Chemistry published new progress about Benzimidazoles Role: RCT (Reactant), RACT (Reactant or Reagent). 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, Synthetic Route of 3893-18-3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Oi, Miku; Takita, Ryo; Kanazawa, Junichiro; Muranaka, Atsuya; Wang, Chao; Uchiyama, Masanobu published the artcile< Organocopper cross-coupling reaction for C-C bond formation on highly sterically hindered structures>, Product Details of C7H7BrO2S, the main research area is organocopper compound aryl iodide cross coupling reaction mechanism.

A powerful, broadly applicable cross-coupling protocol that enabled carbon-carbon bond formation at highly sterically hindered carbon centers (both sp2 and sp3) by employing organocopper reagents under palladium catalysis was described. Exptl. studies and theor. calculations indicated that the key to the unique reactivity of copper was the relatively low activation energy of the compact transmetalation transition state, due to Cu(I)-Pd(II) interaction, which was associated with small values of deformation energy of the reactants. This reaction was applicable to a variety of bulky substrates, including compounds inert to previous cross-coupling chem. and has high functional group tolerance.

Chemical Science published new progress about Aryl bromides Role: PRP (Properties), RCT (Reactant), RACT (Reactant or Reagent). 5751-83-7 belongs to class bromides-buliding-blocks, and the molecular formula is C7H7BrO2S, Product Details of C7H7BrO2S.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Smith, Bradley D.; Goodenough-Lashua, DeeAnne M.; D’Souza, Carlisle J. E.; Norton, Kieran J.; Schmidt, Leslie M.; Tung, James C. published the artcile< Substituent effects on the barrier to carbamate C-N rotation>, Formula: C12H16BrNO2, the main research area is substituent effect barrier carbamate carbon nitrogen rotation.

Seven aryl-substituted t-Bu N-methyl-N-aryl carbamates were prepared, and in each case, the barrier to C-N bond rotation, ΔG‡, was determined in CDCl3 solution using variable temperature NMR. A linear free energy relationship is observed between ΔG‡ and the electronic stabilization effect of the substituent on the N-aryl ring. More specifically, electron donating groups increase ΔG‡, whereas withdrawing groups decrease ΔG‡. A plot against σ- was more linear (r2=0.96), than a plot against σ (r2 = 0.90) or σ+ (r2 = 0.88) and a value of ρ = 1.76 was obtained at 243 K. Thus, rotation about the carbamate C-N bond in weakly polar chloroform involves a decrease in pos. charge on the nitrogen.

Tetrahedron Letters published new progress about C-N bond. 639520-70-0 belongs to class bromides-buliding-blocks, and the molecular formula is C12H16BrNO2, Formula: C12H16BrNO2.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Wang, Na; Zhang, Wei; Zhou, Long-Hua; Deng, Qing-Feng; Xie, Zong-Bo; Yu, Xiao-Qi published the artcile< One-Pot Lipase-Catalyzed Aldol Reaction Combination of In Situ Formed Acetaldehyde>, Category: bromides-buliding-blocks, the main research area is lipase aldol condensation addition acetaldehyde aldehyde.

A facile tandem route to α,β-unsaturated aldehydes was developed by combining the two catalytic activities of the same enzyme in a one-pot strategy for the aldol reaction and in situ generation of acetaldehyde. Lipase from Mucor miehei was found to have conventional and promiscuous catalytic activities for the hydrolysis of vinyl acetate and aldol condensation with in situ formed acetaldehyde. The first reaction continuously provided material for the second reaction, which effectively reduced the volatilization loss, oxidation, and polymerization of acetaldehyde, as well as avoided a neg. effect on the enzyme of excessive amounts of acetaldehyde. After optimizing the process, several substrates participated in the reaction and provided the target products in moderate to high yields using this single lipase-catalyzed one-pot biotransformation.

Applied Biochemistry and Biotechnology published new progress about Aldol addition. 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, Category: bromides-buliding-blocks.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Guo, Zhewen; Zhao, Jun; Liu, Yuhang; Li, Guangfeng; Wang, Heng; Hou, Yali; Zhang, Mingming; Li, Xiaopeng; Yan, Xuzhou published the artcile< Conformational effect on fluorescence emission of tetraphenylethylene-based metallacycles>, Reference of 184239-35-8, the main research area is phenylene bridged pyridyl platinum metallacycle preparation crystal mol structure; conformation fluorescence emission tetraphenylethylene phenylene bridged pyridyl platinum metallacycle.

Herein, the authors designed and constructed two metallacycles, 1 and 2, to illustrate the conformational effect of isomeric AIE fluorophores on the platform of supramol. coordination complexes (SCCs). Specifically, the dangling Ph rings in TPE units of the metallacycle 1 align completely outside the main cyclic structure, while in the metallacycle 2, these Ph rings align half inside and half outside. The exptl. results showed that two metallacycles exhibited different behaviors in terms of AIE fluorescence and chem. sensing, which could be attributed to the subtle structural difference of the TPE units. This work represents the unification of topics such as self-assembly, AIE, and chem. sensing, and further promotes the understanding for the structure-property relationship of isomeric AIE fluorophores.

Chinese Chemical Letters published new progress about Crystal structure. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Reference of 184239-35-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Cohen, Julius Berend; Zortman, Israel Hyman published the artcile< The relation of position isomerism to optical activity. V. The rotation of the menthyl esters of the isomeric dibromobenzoic acids>, Application In Synthesis of 603-78-1, the main research area is .

The esters were prepared by oxidizing the six dibromotoluenes to the corresponding acids, which were then converted into the acid chlorides, and the latter into the esters by heating with menthol. The preparation of menthyl 2:3-dibromobenzoate, menthyl 2:4-dibromobenzoate, menthyl 2:5-dibromobenzoate, menthyl 2:6-dibromobenzoate, menthyl 3:4-dibromobenzoate, and menthyl 3:5-dibromobenzoate are described.

Journal of the Chemical Society, Transactions published new progress about Boiling point. 603-78-1 belongs to class bromides-buliding-blocks, and the molecular formula is C7H4Br2O2, Application In Synthesis of 603-78-1.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Kayser, Margaret M. published the artcile< The internal steric push-effect: its consequences on the reactivity of carbonyl functions in 3-substituted phthalic anhydrides>, COA of Formula: C8H3BrO3, the main research area is NMR phthalic anhydride; regioselectivity nucleophilic addition; mol mechanic phthalic anhydride.

The 13C NMR for a number of 3-substituted phthalic anhydrides and corresponding lactones were measured. Substituent effects were discussed. MM2 calculations for several 3-substituted phthalic anhydrides predict that the substituent and the neighboring carbonyl group remain coplanar and within the plane of the aromatic ring. To alleviate the imposed crowding, there is an in-plane distortion of the bond angle of the substituent and the carbonyl function. The observed angle of distortion increases with increasing steric demand of the substituent, in agreement with repulsive van der Waals interaction between those two groups. Diminished reactivity of the ortho carbonyl groups vis-a-vis nucleophiles in 3-substituted phthalic anhydrides may be linked to the internal steric push-effect which causes the displacement of electrons in the CO bond from O to C.

Spectroscopy Letters published new progress about Bond angle. 82-73-5 belongs to class bromides-buliding-blocks, and the molecular formula is C8H3BrO3, COA of Formula: C8H3BrO3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Adolfo Cuesta, Sebastian; Cordova-Sintjago, Tania; Ramon Mora, Jose published the artcile< Sulfonylation of Five-Membered Aromatic Heterocycles Compounds through Nucleophilic Aromatic Substitution: Concerted or Stepwise Mechanism?>, Recommanded Product: Ethyl 5-bromothiophene-2-carboxylate, the main research area is heterocyclic compound sulfonylation nucleophilic aromatic substitution mechanism activation energy.

Heterocyclic sulfones are relevant in medicinal chem., drug design and organic synthesis, and the mechanism of sulfonylation of five-membered heterocycles is not clear. In this work, it is presented a computational study on the mechanism of sulfonylation of five-membered heterocycles compounds Concerted and stepwise mechanisms for the nucleophilic aromatic substitution (SNAr) involved in the reaction were examined Effect of the neighboring group (NG), heteroatom in the ring (HT), nucleophile (NU), and leaving group (LG) in fourteen reactions were examined Anal. of the intrinsic reaction coordinate, reaction force, natural bond orbital (NBO) charges and bond indexes give a reasonable insight about the mechanism for the reactions studied. Results revealed activation free energies ranging from 20.8 kcal/mol up to 38.6 kcal/mol. Reaction force anal. showed that structural changes in the reactant are the most important component associated with the energy of activation with more than 60% of the contribution. Most sulfonylation reactions in this study proceed through a concerted mechanism; only two occur though a stepwise-Meisenheimer-intermediate mechanism.

ChemistrySelect published new progress about Activation energy. 5751-83-7 belongs to class bromides-buliding-blocks, and the molecular formula is C7H7BrO2S, Recommanded Product: Ethyl 5-bromothiophene-2-carboxylate.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Jiang, Jianfeng; Wang, Xia; Liu, Shengping; Zhang, Sichen; Yang, Binmiao; Zhao, Yu; Lu, Shenci published the artcile< Enantioselective Cascade Annulation of α-Amino-ynones and Enals Enabled by Gold and Oxidative NHC Relay Catalysis>, Computed Properties of 3893-18-3, the main research area is pyrrole fused lactone preparation enantioselective; amino ynone enal oxidative tandem cyclization gold catalyst; Cascade Annulation; Cycloaddition; Enantioselectivity; Gold Catalysis; Relay Catalysis.

Unprecedented gold and oxidative NHC relay catalysis enables highly enantioselective cascade annulation between readily available α-amino-ynones R1CCC(O)CH2NHR2 (R1 = H, Ph, 4-fluorophenyl, 3,5-dimethoxyphenyl, etc.; R2 = Boc, Ts, Cbz) with enals R3CH=CHC(O)H (R3 = prop-1-en-1-yl, Ph, 2-thienyl, 2-naphthyl, etc.). This method utilizes the in situ-generated pyrrolin-4-ones as a novel and versatile synthon, which engage with α,β;-unsaturated acylazolium intermediates generated from enals by oxidative NHC catalysis to produce pyrrole-fused lactones I in high yield and excellent enantioselectivity. Synthetic utility of the lactone products is also demonstrated by facile conversion to densely functionalized pyrroles/pyrrolin-4-ones e.g., II in high yields with excellent stereopurity.

Angewandte Chemie, International Edition published new progress about Alkynyl ketones Role: RCT (Reactant), RACT (Reactant or Reagent). 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