4445-34-5

Upstream product

• 6050-13-1 biphenyl-2,2'-dicarboxylic acid anhydride 
• 18773-63-2 2'-hydroxymethyl-biphenyl-2-carboxylic acid 
• 863305-32-2 diphenic acid 
• 38399-64-3 2'-Hydroxymethyl-1,1'-biphenyl-carbonsaeuremethylester 
• 64-17-5 ethanol 
• 1210-05-5 Biphenyl-2,2'-dicarbaldehyde 
• 3594-90-9 2,2'-bis(hydroxymethyl)biphenyl 
• 574758-71-7 tert-butyldimethyl-(2'-vinyl-2-biphenylmethanol)silane 
• 64024-89-1 2'-Vinyl-2-biphenylmethanol 
• 583032-17-1 2'-(tert-butyl-dimethyl-silanyloxymethyl)-biphenyl-2-carbaldehyde 
• 583032-25-1 [2'-(tert-butyl-dimethyl-silanyloxymethyl)-biphenyl-2-yl]-methanol 
• 6926-84-7 1,1'-biphenyl-2,2'-dicarboxylic acid monomethyl ester 
• 766-92-7 [(methylthio)methyl]-benzene 
• 65-85-0 benzoic acid 

Downstream Products

• 125090-32-6 2-phthalimidomethyl-2'-carboxymethylbiphenyl-AlaOMe 
• 125090-31-5 2-phthalimidomethyl-2'-carboxymethylbiphenyl 
• 125127-50-6 2'-(1,3-Dioxo-1,3-dihydro-isoindol-2-ylmethyl)-biphenyl-2-carbonyl chloride 
• 119297-30-2 2'-(phthalimidomethyl)biphenyl-2-carboxylic acid 

Relevant academic research and scientific papers

Radical Approach to Thioester-Containing Polymers

A new approach to radical ring-opening polymerization is presented that employs a new thionolactone monomer to generate polymers with thioester-containing backbones. The use of a thiocarbonyl acceptor overcomes longstanding reactivity problems in the field to give complete ring-opening and quantitative incorporation into a variety of acrylate polymers. The resulting copolymers readily degrade under hydrolytic conditions, in addition to cysteine-mediated degradation through transthioesterification. The strategy is compatible with reversible addition-fragmentation chain transfer (RAFT) polymerization and permits the synthesis of block polymers for the preparation of well-defined macromolecular structures.

Regioselective biocatalytic self-sufficient Tishchenko-type reactionviaformal intramolecular hydride transfer

A self-sufficient nicotinamide-dependent intramolecular bio-Tishchenko-type reaction was developed. The reaction is catalyzed by alcohol dehydrogenases and proceeds through formal intramolecular hydride transfer on dialdehydes to deliver lactones. Regioselectivity on [1,1′-biphenyl]-2,2′-dicarbaldehyde substrates could be controlledviathe electronic properties of the substituents. Preparative scale synthesis provided access to substituted dibenzo[c,e]oxepin-5(7H)-ones.

(Cyclopentadienone)iron-Catalyzed Transfer Dehydrogenation of Symmetrical and Unsymmetrical Diols to Lactones

Air-stable iron carbonyl compounds bearing cyclopentadienone ligands with varying substitution were explored as catalysts in dehydrogenative diol lactonization reactions using acetone as both the solvent and hydrogen acceptor. Two catalysts with trimethylsilyl groups in the 2- A nd 5-positions, [2,5-(SiMe3)2-3,4-(CH2)4(δ4-C4C= O)]Fe(CO)3 (1) and [2,5-(SiMe3)2-3,4-(CH2)3(δ4-C4C= O)]Fe(CO)3 (2), were found to be the most active, with 2 being the most selective in the lactonization of diols containing both primary and secondary alcohols. Lactones containing five-, six-, and seven-membered rings were successfully synthesized, and no over-oxidations to carboxylic acids were detected. The lactonization of unsymmetrical diols containing two primary alcohols occurred with catalyst 1, but selectivity was low based on alcohol electronics and modest based on alcohol sterics. Evidence for a transfer dehydrogenation mechanism was found, and insight into the origin of selectivity in the lactonization of 1°/2° diols was obtained. Additionally, spectroscopic evidence for a trimethylamine-ligated iron species formed in solution during the reaction was discovered.

Degradable vinyl copolymers through thiocarbonyl addition-ring-opening (TARO) polymerization

The radical copolymerization of the thionolactone dibenzo[c,e]oxepane-5-thione with acrylates, acrylonitrile, and N,N-dimethylacrylamide afforded copolymers containing a controllable amount of backbone thioesters which could be selectively cleaved. The pr

Platinum-on-Carbon-Catalyzed Aqueous Oxidative Lactonization of Diols by Using Molecular Oxygen

A lactonization of various diols catalyzed by platinum on carbon (Pt/C) in water under an atmosphere of molecular oxygen was developed. Derivatives of 1,4- 1,5- and 1,6-diols were transformed into the corresponding five-, six-, and seven-membered lactones by the present oxidative lactonization method.

Ruthenium(II) Catalysis/Noncovalent Interaction Synergy for Cross-Dehydrogenative Coupling of Arene Carboxylic Acids

A ruthenium-catalyzed cross-dehydrogenative coupling is developed with the aid of a weakly coordinating carboxylic acid group toward the dimerization of arene carboxylic acids. The protocol is operationally simple and suitable to fabricate diverse homodimerized as well as cross-dimerized products in high yields. Computational insights have also been unveiled to comprehend the plausible reaction mechanism. The critical innovation of the synthetic strategy hinges on the soluble basic additive DBU, which constitutes a synergy of Ru(II)-catalysis with noncovalent interaction and, thus, stabilizes pivotal intermediates to promote the challenging dimerization process.

A microwave for rapid preparation of biaryl seven-membered lactone method

The invention provides a method for quickly preparing polyaryls 7-membered lactone in a microwave manner. The method comprises the following steps of A, performing umpolung reaction under microwave irradiation of 700-900 W and at the temperature of 25-80 DEG C by using a compound 1 as a reagent, using dissolved oxygen acetonitrile as solvent and using N-heterocyclic carbene as a catalyst to obtain a crude product; and B, extracting the polyaryls 7-membered lactone, namely a compound 2, from the crude product. An equation of the reaction is as shown in the specification, wherein R and R' are respectively and independently selected from halogen, nitro group, methyl group, methoxy group and phenyl group of which a benzene ring has two common carbon atoms, and X is halogen. By the method, the polyaryls 7-membered lactone with yield higher than 85% can be obtained within 60 minutes at most. Compared with a reported preparation technology, the method has the advantages that reaction time is shortened, production efficiency is high, and a technology is simple.

A microwave-promoted/Assisted method for rapid preparation of biaryl seven-membered lactones

Background: Biaryl seven-membered lactones (BSLs), the target compounds are a class of bioactive compounds with anti-Arrhythmic activity, which also serve as a starting material or structural units for chemical synthesis. Objective: To report a simple and efficient procedure for the synthesis of biaryl seven-membered lactones. Method: Under microwave, the umpolung reaction was promoted by N-heterocyclic carbenes under oxygen, with anhydrous potassium carbonate as base and with 1,4,7,10,13,16-Hexanoxacyclooctadecane (18-crown-6) as a phase-Transfer catalyst. Results: The practical protocol was found to be compatible with different structurally diverse substrates and with moderate to excellent yields. Conclusion: This synthesis method has the advantage of high efficacy and novelty, short reaction time, operation simplicity, mild condition and high yields, providing a useful and atom-economic approach to the synthesis of BSLs.

Iron(II) pincer-catalyzed synthesis of lactones and lactams through a versatile dehydrogenative domino sequence

The synthesis of lactones and lactams by using iron(II) pincer-catalyzed dehydrogenative methodology was developed. Starting from 1,n-diols or 1,n-amino alcohols, this domino transformation takes place through initial dehydrogenation of the substrates, subsequent intramolecular cyclization, and final oxidation to afford the desired products in good yields. The ability to access heterocycles of different sizes makes this protocol especially versatile, in which two consecutive oxidation reactions are performed without requiring an external oxidant. In this paper, we report the application of the Fe-MACHO-BH complex [carbonylhydrido(tetrahydroborato)[bis(2-diisopropylphosphinoethyl)amino]iron(II)] in this atom-efficient and environmentally benign process, for which molecular hydrogen is formed as the only stoichiometric side product. Just a little pinch: The iron(II) pincer-catalyzed synthesis of lactones and lactams from easily available 1,n-diols and 1,n-amino alcohols is explored. The use of a nontoxic metal as well as the generation of molecular hydrogen as the only stoichiometric byproduct makes this method a highly atom-efficient and environmentally benign process.

Organocatalytic Aerobic Oxidation of Benzylic sp3 C-H Bonds of Ethers and Alkylarenes Promoted by a Recyclable TEMPO Catalyst

An entirely metal-free catalyst system consisting of an easily prepared recyclable new TEMPO derived sulfonic salt catalyst, and mineral acids (NaNO2 and HCl) has been developed for selective aerobic oxidation of structurally diverse benzylic sp3 C-H bonds of ethers and alkylarenes. The mild reaction conditions allow for the generation of synthetically and biologically valued isochromanones and xanthones from readily accessible alkyl aromatic precursors in good yields.