Month: December 2022

Cai, Wen-Qiang published the artcileNi-Catalyzed Enantioselective Benzylation of Secondary Phosphine Oxide, Safety of 1-(Chloromethyl)-4-(trifluoromethyl)benzene, the publication is Organic Letters (2022), 24(5), 1258-1262, database is CAplus and MEDLINE.

A nickel-catalyzed benzylic substitution of secondary phosphine oxide was described, affording the dialkylated P-stereogenic tertiary phosphine oxides with high to excellent enantioselectivities. The reaction was performed under mild conditions with com. available benzyl chlorides and bench stable secondary phosphine oxides, exhibiting broad functional group tolerance. It represented a practical example for the preparation of P-stereogenic phosphine compounds

Organic Letters published new progress about 939-99-1. 939-99-1 belongs to chlorides-buliding-blocks, auxiliary class Fluoride,Chloride,Benzyl chloride,Benzene, name is 1-(Chloromethyl)-4-(trifluoromethyl)benzene, and the molecular formula is C8H6ClF3, Safety of 1-(Chloromethyl)-4-(trifluoromethyl)benzene.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Jing, Ke published the artcileVisible-light photoredox-catalyzed carboxylation of benzyl halides with CO₂: Mild and transition-metal-free, HPLC of Formula: 939-99-1, the publication is Chinese Journal of Catalysis (2022), 43(7), 1667-1673, database is CAplus.

The visible-light photoredox-catalyzed carboxylation of benzyl chlorides and bromides with CO₂ has been reported. With inexpensive organic dyes as photocatalysts and amines as electron donors, this carboxylation proceeds well in the absence of sensitive organometallic reagents, transition metal catalysts, or metallic reductants. A wide range of com. available and inexpensive benzyl halides undergo such carboxylation to give valuable aryl acetic acids, including several pharmaceutical mols. and drug precursors, in moderate to high yields. Moreover, this reaction features mild reaction conditions (one atm. pressure of CO₂ and room temperature), broad substrate scope, good functional group tolerance, easy scalability, and low catalyst loading, thus providing an efficient approach for the assembly of aryl acetic acids.

Chinese Journal of Catalysis published new progress about 939-99-1. 939-99-1 belongs to chlorides-buliding-blocks, auxiliary class Fluoride,Chloride,Benzyl chloride,Benzene, name is 1-(Chloromethyl)-4-(trifluoromethyl)benzene, and the molecular formula is C8H6ClF3, HPLC of Formula: 939-99-1.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Ma, Zhi-Gang published the artcileAsymmetric Organocatalytic Synthesis of 2,3-Allenamides from Hydrogen-Bond-Stabilized Enynamides, Safety of 2,3-Dibromopropionylchloride, the publication is Organic Letters (2019), 21(7), 2468-2472, database is CAplus and MEDLINE.

Asym. catalytic synthesis of 2,3-allenamides from hydrogen-bond-stabilized enynamides in the presence of quinine-based bifunctional squaramide organocatalysts is described. This protocol forms a variety of 2,3-allenamides in high yields and excellent stereoselectivities, in which the elaborated introduction of intramol. H-bonds within the N,N-bidentate amide group constitutes one of the keys to this highly enantioselective transformation. The synthetic practicality of this reaction was demonstrated by the axis-to-center chirality transfer of allenamides to furnish enantiomerically enriched building blocks.

Organic Letters published new progress about 18791-02-1. 18791-02-1 belongs to chlorides-buliding-blocks, auxiliary class Aliphatic Chain, name is 2,3-Dibromopropionylchloride, and the molecular formula is C3H3Br2ClO, Safety of 2,3-Dibromopropionylchloride.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Chen, Xinyu published the artcileAcetylcholinesterase Inhibitors with Photoswitchable Inhibition of β-Amyloid Aggregation, Computed Properties of 219537-97-0, the publication is ACS Chemical Neuroscience (2014), 5(5), 377-389, database is CAplus and MEDLINE.

Photochromic cholinesterase inhibitors were obtained from cis-1,2-α-dithienylethene-based compounds by incorporating one or two aminopolymethylene tacrine groups. All target compounds are potent acetyl- (AChE) and butyrylcholinesterase (BChE) inhibitors in the nanomolar concentration range. Compound I bearing an octylene linker exhibited interactions with both the catalytic active site (CAS) and the peripheral anionic site (PAS) of AChE. Yet upon irradiation with light, the mechanism of interaction varied from one photochromic form to another, which was investigated by kinetic studies and proved “photoswitchable”. The AChE-induced β-amyloid (Aβ) aggregation assay gave further exptl. support to this finding: Aβ_1-40 aggregation catalyzed by the PAS of AChE might be inhibited by compound I in a concentration-dependent manner and seems to occur only with one photochromic form. Computational docking studies provided potential binding modes of the compound Docking studies and mol. dynamics (MD) simulations for the ring-open and -closed form indicate a difference in binding. Although both forms can interact with the PAS, more stable interactions are observed for the ring-open form based upon stabilization of a water mol. network within the enzyme, whereas the ring-closed form lacks the required conformational flexibility for an analogous binding mode. The photoswitchable inhibitor identified might serve as valuable mol. tool to investigate the different biol. properties of AChE as well as its role in pathogenesis of AD in in vitro assays.

ACS Chemical Neuroscience published new progress about 219537-97-0. 219537-97-0 belongs to chlorides-buliding-blocks, auxiliary class Fused/Partially Saturated Cycles,Cyclopentenes, name is 5-Chloro-3-[2-(5-chloro-2-methylthien-3-yl)cyclopent-1-en-1-yl]-2-methylthiophene, and the molecular formula is C15H14Cl2S2, Computed Properties of 219537-97-0.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Senaweera, Sameera published the artcileS_NAr catalysis enhanced by an aromatic donor-acceptor interaction; facile access to chlorinated polyfluoroarenes, Name: N-Benzyl-N,N-dibutylbutan-1-aminium chloride, the publication is Chemical Communications (Cambridge, United Kingdom) (2017), 53(54), 7545-7548, database is CAplus and MEDLINE.

Selective catalytic S_NAr reaction of polyfluoroaryl C-F bonds with chloride is shown. Stoichiometric TMSCl makes the reaction exergonic and allows catalysis, which involves ground state elevation of chloride, aromatic donor-acceptor interactions, and stabilization of the Meisenheimer complex. Traditional cross-coupling of the products is now possible and demonstrates the utility. Thus, e.g., treatment of pentafluoropyridine with TMSCl and benzyltributylammonium chloride afforded 4-chloro-2,3,5,6-tetrafluoropyridine (95%).

Chemical Communications (Cambridge, United Kingdom) published new progress about 23616-79-7. 23616-79-7 belongs to chlorides-buliding-blocks, auxiliary class Phase Transfer Catalyst, name is N-Benzyl-N,N-dibutylbutan-1-aminium chloride, and the molecular formula is C2H2N4O2, Name: N-Benzyl-N,N-dibutylbutan-1-aminium chloride.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Davis, Rohan A. published the artcileThe isolation and synthesis of 3-chloro-4-hydroxyphenylacetamide produced by a plant-associated microfungus of the genus Xylaria, Category: chlorides-buliding-blocks, the publication is Tetrahedron Letters (2005), 46(6), 919-921, database is CAplus.

Chem. investigations of the fermentation broth from the microfungus Xylaria sp. have afforded the new natural product 3-chloro-4-hydroxyphenylacetamide (I) and the previously reported fungal metabolite 3-chloro-4-hydroxyphenylacetic acid (II). This letter reports the isolation and full spectroscopic characterization of I and II by NMR, UV, IR and MS data. The crystal structure and 1-pot synthesis of I are also reported.

Tetrahedron Letters published new progress about 33697-81-3. 33697-81-3 belongs to chlorides-buliding-blocks, auxiliary class Chloride,Carboxylic acid,Benzene,Phenol, name is 3-Chloro-4-hydroxyphenylacetic acid, and the molecular formula is C8H7ClO3, Category: chlorides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Kulkarni, Sameer S. published the artcileDiselenide-selenoester ligation for chemical protein synthesis, COA of Formula: C19H14Cl2, the publication is Nature Protocols (2019), 14(7), 2229-2257, database is CAplus and MEDLINE.

Chemoselective peptide ligation methods have provided synthetic access to numerous proteins, including those bearing native post-translational modifications and unnatural labels. This protocol outlines the chem. synthesis of proteins using a recently discovered reaction (diselenide-selenoester ligation (DSL)) in a rapid, additive-free manner. After ligation, the products can be chemoselectively deselenized to produce native peptide and protein products. We describe methods for the synthesis of suitably functionalized peptide diselenide and peptide selenoester fragments via Fmoc-solid-phase peptide synthesis (SPPS) protocols, fusion of these fragments by DSL, and the chemoselective deselenization of the ligation products to generate native synthetic proteins. We demonstrate the method’s utility through the total chem. synthesis of the post-translationally modified collagenous domain of the hormone adiponectin via DSL-deselenization at selenocystine (the oxidized form of selenocysteine) and the rapid preparation of two tick-derived thrombin-inhibiting proteins by DSL-deselenization at β-selenoaspartate and γ-selenoglutamate. This method should find widespread use for the rapid synthesis of proteins, including cases in which other peptide ligation methods cannot be used (or cannot be used efficiently), e.g., at sterically hindered or deactivated acyl donors. The method’s speed and efficiency may render it useful in the generation of synthetic protein libraries. Each protein discussed can be synthesized within 15 working days from resin loading and can be readily produced by practitioners with master’s-level experience in organic chem. Each synthesis using these protocols was performed independently by two labs (one academic and one industrial), which attained comparable yields of the protein products.

Nature Protocols published new progress about 42074-68-0. 42074-68-0 belongs to chlorides-buliding-blocks, auxiliary class Chloride,Benzyl chloride,Benzene, name is 2-Chlorotrityl chloride, and the molecular formula is C19H14Cl2, COA of Formula: C19H14Cl2.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Yamaga, Hiroaki published the artcileAmino acid derivative reactivity assay-organic solvent reaction system: A novel alternative test for skin sensitization capable of assessing highly hydrophobic substances, Product Details of C12H15ClO3, the publication is Journal of Applied Toxicology (2021), 41(10), 1634-1648, database is CAplus and MEDLINE.

The amino acid derivative reactivity assay (ADRA) is an in chemico alternative to animal testing that focuses on protein binding. The ADRA is a skin sensitization test that solves problems associated with the direct peptide reactivity assay. However, when utilizing the ADRA to evaluate highly hydrophobic substances with octanol/water partition coefficients (logKow) of >6, the test substances may not dissolve in the reaction solution, which can prevent the accurate assessment of skin sensitization. Therefore, we developed the ADRA-organic solvent (ADRA-OS) reaction system, which is a novel skin sensitization test that enables the assessment of highly hydrophobic substances with a logKow of >6. We discovered that the organic solvent ratio, the triethylamine concentration, and the EDTA disodium salt dihydrate concentration participate in reactions with the nucleophile N-(2-(1-naphthyl)acetyl)-L-cysteine (NAC) and sensitizers that are used in ADRA and in stabilizing NAC. Thus, we determined the optimal reaction composition of the ADRA-OS according to L₉ (3³) orthogonal array experiments Using this test, we assessed 14 types of highly hydrophobic substances. When we compared the results with ADRA, we found that ADRA-OS reaction system has high solubility for highly hydrophobic substances and that it has a high predictive capacity (sensitivity: 63%, specificity: 100%, accuracy: 79%). The implication of the results is that the novel ADRA-OS reaction system should provide a useful method for assessing the skin sensitization of highly hydrophobic substances with a logKow of >6.

Journal of Applied Toxicology published new progress about 637-07-0. 637-07-0 belongs to chlorides-buliding-blocks, auxiliary class Inhibitor,Cell Cycle,PPAR, name is Ethyl 2-(4-chlorophenoxy)-2-methylpropanoate, and the molecular formula is C7H13BrSi, Product Details of C12H15ClO3.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Carran, John published the artcileAn improved synthesis of dichloroalkylphosphonates, chloro alkynes, and terminal alkynes via diethyl dichloromethylphosphonate, SDS of cas: 866-23-9, the publication is Synthesis (1996), 1494-1498, database is CAplus.

(EtO)₂P(O)CHCl₂ was synthesized in good yield by reduction of (EtO)₂P(O)CHCl₃ with Me₂CHMgCl and subsequent hydrolysis. The reactivity of (EtO)₂P(O)CHCl₂ towards α-alkylation and its utility in the synthesis of chloro alkynes and terminal alkynes was investigated.

Synthesis published new progress about 866-23-9. 866-23-9 belongs to chlorides-buliding-blocks, auxiliary class Aliphatic Chain, name is Diethyltrichloromethylphosphonate, and the molecular formula is C5H10Cl3O3P, SDS of cas: 866-23-9.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Chevis, Philip J. published the artcileHighly diastereoselective synthesis of enantioenriched anti-α-allyl-β-fluoroamines, Safety of ((1S,4R)-7,7-Dimethyl-2-oxobicyclo[2.2.1]heptan-1-yl)methanesulfonyl chloride, the publication is Chemical Communications (Cambridge, United Kingdom) (2019), 55(43), 6050-6053, database is CAplus and MEDLINE.

A highly diastereoselective synthesis of anti-α-allyl-β-fluoroamines was developed involving enantioselective α-fluorination of aldehydes followed by a diastereoselective Petasis allyl borono-Mannich reaction. The products are obtained generally in good overall yields for the two steps and with drs of 97 : 3-99 : 1 and ees of 86-92%. Selected products were converted to 3-, 5- and 6-membered ring heterocycles, the latter two types incorporating an exo-cyclic fluorine.

Chemical Communications (Cambridge, United Kingdom) published new progress about 21286-54-4. 21286-54-4 belongs to chlorides-buliding-blocks, auxiliary class Chiral,Chloride,Sulfonyl chlorides,Aliphatic cyclic hydrocarbon,Ketone, name is ((1S,4R)-7,7-Dimethyl-2-oxobicyclo[2.2.1]heptan-1-yl)methanesulfonyl chloride, and the molecular formula is C10H15ClO3S, Safety of ((1S,4R)-7,7-Dimethyl-2-oxobicyclo[2.2.1]heptan-1-yl)methanesulfonyl chloride.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics