1055967-01-5

Upstream product

• 626-35-7 nitroacetic acid ethyl ester 
• 2039-87-4 2-chlorostyrene 
• 623-33-6 glycine ethyl ester hydrochloride 
• 623-73-4 diazoacetic acid ethyl ester 

Downstream Products

• 1055967-44-6 (5-(2-chlorophenyl)-4,5-dihydroisoxazol-3-yl)methanol 

Relevant academic research and scientific papers

Coupling Reaction of Cu-Based Carbene and Nitroso Radical: A Tandem Reaction to Construct Isoxazolines

In this letter, an unprecedented cross-coupling reaction between copper carbene and nitroso radical has been developed. This radical-carbene coupling reaction (RCC reaction) offers a novel approach for the preparation of various isoxazolines, which features the construction of C-C, C-O, and C=N bonds in a one-pot process. The synthetic utility of our method is further enhanced by its mild reaction conditions, wide substrate scope, and simple procedures.

Acyclic nitronate olefin cycloaddition (ANOC): regio- And stereospecific synthesis of isoxazolines

We report the first demonstrations of intra- and intermolecular acyclic nitronate olefin cycloaddition (ANOC) reactions that enable the highly efficient syntheses of isoxazolines bearing various functional groups. This general approach to accessing γ-lactone fused isoxazolines was hitherto unprecedented. The room temperature transformations reported herein exhibit wide substrate scopes, as evidenced by more than 70 examples, including the generation of five tricyclic isoxazolines. The robustness of this methodology was confirmed by a series of trials that afforded highly functionalized isoxazolines. Both experimental results and density functional theory calculations indicate that these transformations proceed via the in situ formation of acyclic nitronates together with concerted [3+2] cycloaddition and tert-butyloxy group elimination processes to give regio- and stereospecificity. This journal is

Oxidize Amines to Nitrile Oxides: One Type of Amine Oxidation and Its Application to Directly Construct Isoxazoles and Isoxazolines

A facile oxidative heterocyclization of commercially available amines and tert-butyl nitrite with alkynes or alkenes leading to isoxazoles or isoxazolines is described. The unprecedented strategy of the oxidation of an amine directly to a nitrile oxide was used in this cyclization process. This reaction is highly efficient, regiospecific, operationally simple, mild, and tolerant of a variety of functional groups. Control experiments support a nitrile oxide intermediate mechanism for this novel class of oxidative cyclization reactions. Moreover, synthetic applications toward bioactive molecular skeletons and the late-stage modification of drugs were realized.

Method for preparing isoxazoline

The invention relates to a method for preparing isoxazoline, which comprises the steps of reacting olefin, a diazo compound and tert-butyl nitrite in an organic solvent at the temperature of 25-50 DEGC under the action of a Lewis acid catalyst to obtain isoxazoline after complete reaction. Lewis acid is used as a catalyst for synthesizing isoxazoline, reaction conditions are mild and can be carried out under the condition that the temperature is as low as the room temperature, use of transition metal is avoided, and the product yield is high.

Design, synthesis of novel 4,5-dihydroisoxazole-containing benzamide derivatives as highly potent FtsZ inhibitors capable of killing a variety of MDR Staphylococcus aureus

Antibiotic resistance among clinically significant bacterial pathogens, such as methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant S. aureus (VRSA) is becoming a prevalent threat to public health, and new antibacterial agents with novel mechanisms of action hence are in an urgent need. As a part of continuing effort to develop antibacterial agents, we rationally designed and synthesized two series of 4,5-dihydroisoxazol-5-yl and 4,5-dihydroisoxazol-3-yl-containing benzamide derivatives that targeted the bacterial cell division protein FtsZ. Evaluation of their activity against a panel of Gram-positive and -negative pathogens revealed that compound A16 possessing the 4,5-dihydroisoxazol-5-yl group showed outstanding antibacterial activity (MIC, ≤0.125–0.5 μg/mL) against various testing strains, including methicillin-resistant, penicillin-resistant and clinical isolated S. aureus strains. Besides, further mouse infection model revealed that A16 could be effective in vivo and non-toxic to Hela cells. Finally, a detailed discussion of structure-activity relationships was conducted, referring to the docking results. It is worth noting that substituting a 4,5-dihydroisoxazole ring for the isoxazole ring not only broadened the antibacterial spectrum but also resulted in a significant increase in antibacterial activity against S. aureus strains. Taken together, these results suggest a promising chemotype for the development of new FtsZ-targeting bactericidal agents.

Synthesis of Isoxazolines and Oxazines by Electrochemical Intermolecular [2 + 1 + n] Annulation: Diazo Compounds Act as Radical Acceptors

Reported herein is an unprecedented synthesis of isoxazolines and oxazines through electrochemical intermolecular annulation of alkenes with tert-butyl nitrite, in which diazo compounds serve as radical acceptors. Notably, [2 + 1 + 2] and [2 + 1 + 3] annulations occur when styrenes and allylbenzenes are used as substrates, respectively. The latter reaction undergoes group migration to form more stable radical, manifesting radical route instead of conventional 1,3-dipolar cycloaddition occurs. Moreover, scale-up experiments suggest the potential application value of these transformations in industry.

Method for preparing isoxazoline derivative

The invention discloses a method for preparing an isoxazoline derivative. The method comprises the following steps: by taking an olefin derivative, a diazonium derivative and tert-butyl nitrite as reaction substrates, and a copper compound as a catalyst, in the presence of alkali, coupling metal carbine with a free radical, and further performing serial cyclization reaction, thereby obtaining the isoxazoline derivative. The invention designs a method for very conveniently synthesizing the isoxazoline derivative from cheap and easily obtained raw materials with a cheap metal copper compound as a catalyst in a sealed tube system directly under gentle reaction conditions. By adopting the method, the problems that in a conventional synthesis method, a great amount of oxidants are used, precious metals are adopted as catalysts and harsh experiment conditions such as anhydrous and anaerobic reaction are implemented are avoided, the reaction is simple and feasible, later treatment is simple, and potential industrial application values can be achieved.

SUBSTITUTED HETEROCYCLIC COMPOUNDS USEFUL IN THE TREATMENT OF CARDIOVASCULAR DISEASES

wherein: a.o. T is oxygen, sulfur, or NR11 , in which R11 is hydrogen or lower alkyl; V is -N1 is hydrogen, optionally substituted lower alkyl, optionally substituted cycloalkyl, optionally substituted aryl, or optionally substituted heteroaryl; X2 is optionally substituted aryl or optionally substituted heteroaryl; Y is optionally substituted dihydroheteroarcyl; and Z1 and Z2 are independently optionally substituted alkylene of 1-4 carbon atoms, useful for the treatment of various disease states, in particular cardiovascular diseases such as atrial and ventricular arrhythmias, intermittent claudication, Prinzmetal’s (variant) angina, stable and unstable angina, exercise induced angina, congestive heart disease, and myocardial infarction. The compounds are also useful in the treatment of diabetes.