Day: November 10, 2022

Min, Xiao-Long published the artcileAxial-to-Central Chirality Transfer for Construction of Quaternary Stereocenters via Dearomatization of BINOLs, COA of Formula: C11H12O3, the main research area is spiro benzochromene naphthalenone asym synthesis; binaphthol dearomatization axial chirality transfer propargyl carbonate enantioselective spirocyclization.

Herein, an axial-to-central chirality transfer strategy for the synthesis of chiral quaternary stereocenters via dearomatization of (S)-BINOLs is disclosed. The reaction of (S)-BINOL with a wide range of propargyl carbonates I (R = Me, cyclopropyl, Ph, 4-ClC6H4, 1-naphthyl, 2-benzothienyl, etc.) proceeded smoothly to afford chiral spiro compounds II in high yields with excellent enantioselectivities. In addition, the strategy was extended to kinetic resolution of rac-BINOLs albeit with moderate s value.

Organic Letters published new progress about Dearomatization. 1205-17-0 belongs to class isoquinoline, name is 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde, and the molecular formula is C11H12O3, COA of Formula: C11H12O3.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Min, Xiao-Long published the artcileAxial-to-Central Chirality Transfer for Construction of Quaternary Stereocenters via Dearomatization of BINOLs, Related Products of isoquinoline, the main research area is spiro benzochromene naphthalenone asym synthesis; binaphthol dearomatization axial chirality transfer propargyl carbonate enantioselective spirocyclization.

Herein, an axial-to-central chirality transfer strategy for the synthesis of chiral quaternary stereocenters via dearomatization of (S)-BINOLs is disclosed. The reaction of (S)-BINOL with a wide range of propargyl carbonates I (R = Me, cyclopropyl, Ph, 4-ClC6H4, 1-naphthyl, 2-benzothienyl, etc.) proceeded smoothly to afford chiral spiro compounds II in high yields with excellent enantioselectivities. In addition, the strategy was extended to kinetic resolution of rac-BINOLs albeit with moderate s value.

Organic Letters published new progress about Dearomatization. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Geng, Huihui published the artcilePractical synthesis of C1 deuterated aldehydes enabled by NHC catalysis, Computed Properties of 21834-92-4, the main research area is deuterated aldehyde preparation; aldehyde reversible hydrogen deuterium exchange NHC catalyst.

N-heterocyclic carbenes promoted a reversible hydrogen-deuterium exchange reaction with simple aldehydes, which led to a practical approach to synthetically valuable C1 deuterated aldehydes RC(O)D [R = Ph, Bn, CH=CHPh, etc.]. The reactivity of the well-established N-heterocyclic carbene-catalyzed formation of Breslow intermediates from aldehydes was reengineered to overcome the overwhelmingly kinetically favorable benzoin condensation reaction and achieve the critical reversibility to drive the formation of desired deuterated products when an excess of D2O was employed. Notably, this operationally simple and cost-effective protocol served as a general and truly practical approach to all types of 1-D-aldehydes including aryl, alkyl and alkenyl aldehydes and enabled chemoselective late-stage deuterium incorporation into complex, native therapeutic agents and natural products with uniformly high levels (>95%) of deuterium incorporation for a total of 104 tested substrates.

Nature Catalysis published new progress about Deuteration. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Computed Properties of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Yuan, Kedong published the artcileArylation of gem-difluoroalkenes using a Pd/Cu Co-catalytic system that avoids β-fluoride elimination, Application In Synthesis of 1205-17-0, the main research area is difluorobenzyl methylalkene preparation; difluoroalkene arylsulfonyl chloride palladium copper catalyst diastereoselective arylation.

PdII/CuI co-catalyze an arylation reaction of gem-difluoroalkenes using arylsulfonyl chlorides to deliver α,α-difluorobenzyl products. The reaction proceeded through a β,β-difluoroalkyl-Pd intermediate that typically underwent unimol. β-F elimination to deliver monofluorinated alkene products in a net C-F functionalization reaction. However to avoid β-F elimination, the β,β-difluoroalkyl-Pd intermediate were offered, an alternate low-energy route involving β-H elimination to ultimately deliver difluorinated products in a net arylation/isomerization sequence. Overall, this reaction enabled exploration of new reactivities of unstable fluorinated alkyl-metal species, while also providing new opportunities for transforming readily available fluorinated alkenes into more elaborate substructures.

Chemical Science published new progress about Arylation catalysts, stereoselective. 1205-17-0 belongs to class isoquinoline, name is 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde, and the molecular formula is C11H12O3, Application In Synthesis of 1205-17-0.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Liang, Shuaishuai published the artcileOne-pot synthesis of trifluoromethyl amines and perfluoroalkyl amines with CF3SO2Na and RfSO2Na, Computed Properties of 5961-59-1, the main research area is trifluoromethyl perfluoroalkyl amine preparation; secondary amine sodium fluoroalkylsulfinate trifluoromethylation perfluoroalkylation.

A newly developed CF3SO2Na-based trifluoromethylation of secondary amines has been disclosed, and the method has been successfully extended to the configuration of perfluoroalkyl amines using RfSO2Na, complementing the established synthesis strategy of trifluoromethyl amines. Advantages of the method include good functional group tolerance, mild conditions, and inexpensive or easy-to-handle materials. Mechanistic probes indicate that the thiocarbonyl fluoride formed in situ is the key intermediate in the reaction.

Chemical Communications (Cambridge, United Kingdom) published new progress about Perfluoroalkylation. 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, Computed Properties of 5961-59-1.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Wang, Dongdong published the artcileComparative studies on polysaccharides, triterpenoids, and essential oil from fermented mycelia and cultivated sclerotium of a medicinal and edible mushroom, Poria cocos, SDS of cas: 21834-92-4, the main research area is fermented mycelia cultivated sclerotium triterpenoid polysaccharide essential oil Poria; HS-GC/MS; Poria cocos; content determination; exopolysaccharides; fermented mycelia; secondary metabolites; triterpenoids; water-soluble polysaccharides.

Poria cocos, an important medicinal and edible fungus, is well known in East Asia. The main active components are water-soluble polysaccharides (WPS) and triterpenoids. Due to the growing market demand, long cultivation period, and consumption of pine trunk during cultivation, alternative methods for producing P. cocos or its active components should be investigated. In this study, WPS, triterpenoids, monosaccharide composition, and essential oil in fermented mycelia and cultivated sclerotium were analyzed using UV spectrophotometry, HPLC, pre-column derivatization, and HS-GC/MS, resp. Our results showed that the WPS and triterpenoids in mycelia are several times higher than those in sclerotium. Among the 62 compounds identified by HS-GC/MS anal. from the essential oil obtained from the fermentation media and a fresh external layer, the two main fragrances in common were linalool and Me phenylacetate. Our results suggested that it is applicable to produce polysaccharides and triterpenoids by the fermentation of P. cocos, and a strategy to improve triterpenoid production in the fermentation process was proposed.

Molecules published new progress about Polysaccharides Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, SDS of cas: 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Hu, Chen-Yan published the artcileDegradation kinetics of diatrizoate during UV photolysis and UV/chlorination, Application In Synthesis of 117-96-4, the main research area is diatrizoate UV photolysis chlorination degradation kinetics.

The degradation kinetics of the widely used iodinated X-ray contrast medium, namely diatrizoate, was investigated during UV photolysis and UV/chlorination. Factors influencing diatrizoate degradation, such as pH, chlorine dosage, and bromide concentration, were also evaluated. Diatrizoate was not degraded during chlorination. However, the degradation of diatrizoate during UV photolysis and UV/chlorination complied with the pseudo-first-order kinetics. At pH 7, the pseudo-first-order rate constant during UV/chlorination was 9.3 times higher than that during UV photolysis. The results of a radical quenching test using excessive tert-butanol suggested that the contribution of ·Cl, a type of reactive chlorine species (RCS), was limited. The contributions of UV direct photolysis, hydroxyl radicals (·OH), and RCS to diatrizoate degradation during UV/chlorination at pH 7 were estimated to be 12.8%, 1.2%, and 85.9%, resp. Results of further experiment suggested that ·OCl primarily caused diatrizoate degradation As the chlorine concentration gradually increased from 25 to 150 μM, the corresponding pseudo-first-order rate constant of UV/chlorination increased from 8.37 (±0.42) × 10-3 to 5.52 (±0.28) × 10-2 s-1. When the pH value was increased from 5 to 9, the rate of diatrizoate degradation reached the maximum at pH 7 and gradually decreased during UV/chlorination; however, the rate of diatrizoate degradation remained stable during UV photolysis. The degradation of diatrizoate was inhibited when the bromide concentration was increased due to the competition for chlorine between bromide and diatrizoate; thus, the generation of ·OCl was limited. Compared with UV irradiation, UV/chlorination could reduce the formation of iodinated trihalomethanes (I-THM) after chlorination. However, dichloroacetonitrile (C2HCl2N), which is carcinogenic, was generated during UV/chlorination.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about pH. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Application In Synthesis of 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Luo, Zhenli published the artcileMetal-Free Reductive Amination of Ketones with Amines Using Formic Acid as the Reductant under BF3 · Et2O Catalysis, Computed Properties of 5961-59-1, the main research area is ketone amine formic acid boron trifluoride etherate reductive amination; alkylamine preparation.

BF3·Et2O was found to effectively catalyze reductive amination of ketones with amines employing formic acid as the reductant under metal-free conditions. This transformation tolerated a broad range of primary and secondary amines and differently decorated ketones, delivering N-alkylated amines in good to excellent yields with high compatibility of functional groups. The synthetic potential of this protocol was demonstrated by its application in the preparation of biol. and pharmaceutically relevant compounds

Asian Journal of Organic Chemistry published new progress about Ketones Role: RCT (Reactant), RACT (Reactant or Reagent). 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, Computed Properties of 5961-59-1.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Tomar, Radha published the artcileExpanding the Utility of Inexpensive Pyridine-N-oxide Directing Group for the Site-selective sp2/sp3γ-C-H and sp2δ-C-H Functionalization of Carboxamides, Quality Control of 104-01-8, the main research area is pyridine oxide based biarylacetamide preparation regioselective; heteroaryl based biaryl carboxamide preparation regioselective; tricyclic quinolone preparation regioselective; arylheteroarylmethane preparation regioselective.

In this paper, the scope of pyridine-N-oxide DG was examined for accomplishing the site-selective (mono) γ-C(sp2)-H arylation in substrates containing competitive C(sp3)-H and C(sp2)-H bonds. The investigation had enabled to assemble a library of pyridine-N-oxide-based biarylacetamides, heteroaryl-based biaryl carboxamides, tricyclic quinolones, arylheteroarylmethanes, biaryl-based aliphatic carboxamides and mono (ortho) arylated phenylglycine derivatives In general, biaryl derivatives and in particular, arylacetamide, arylacetic acid derivatives and pyridine-N-oxide (2-aminopyridyl) motifs were medicinally relevant classes of compounds This work enabled the assembling of a library of the above-mentioned types of compounds through the pyridine-N-oxide directing group-aided site-selective sp2/sp3γ-C-H and sp2δ-C-H functionalization of carboxamides.

Asian Journal of Organic Chemistry published new progress about Arylation. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Quality Control of 104-01-8.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Zanghi, Joseph M. published the artcileEnantio- and Diastereoselective Synthesis of Functionalized Carbocycles by Cu-Catalyzed Borylative Cyclization of Alkynes with Ketones, Safety of 1,3-Dimethoxybenzene, the main research area is diastereoselective copper catalyzed borylative cyclization alkyne ketone alkynylcyclohexanedione; cyclohexandione alkynylation propargyl bromide; diboryl indenone preparation oxidation boryl elimination Martins sulfurane; crystal structure chiral diboryl allyl indenone; mol structure chiral diboryl allyl indenone.

A single-pot Cu-catalyzed enantio- and diastereoselective tandem hydroboration/borylative cyclization of alkynes with ketones for the synthesis of carbocycles is reported. The reaction proceeds via desymmetrization and generates four contiguous stereocenters, including an all-C quaternary center. The method provides rapid access to [6,5]- and [5,5]-bicycles and cyclopentane products. Catalyst-controlled diastereoselectivity by selection of bisphosphine ligand is noted. Utility of the products is demonstrated by site- and chemoselective transformations that afford valuable alkenyl and allyl organoborons.

Organic Letters published new progress about Alkynylation. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Safety of 1,3-Dimethoxybenzene.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem