Tag: M.W:100-200

Application In Synthesis of 1-Piperidineacetic Acid. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 1-Piperidineacetic Acid, is researched, Molecular C7H13NO2, CAS is 3235-67-4, about Conformational analysis of 1-piperidineacetic acid by X-ray, FTIR and ab initio calculations. Author is Dega-Szafran, Z.; Kosturkiewicz, Z.; Nowak, E.; Petryna, M.; Szafran, M..

The 1-piperidineacetic acid was synthesized as monohydrate and its structure was determined by x-ray diffraction methods. The crystals are orthorhombic, space group P212121, a 6.7693(7), b 10.816(1), c 11.452(1) A, Z = 4, R = 0.037. The acid mol. appears in the zwitterionic form with two equivalent carboxylic O atoms. The water mols. link carboxylic groups into infinite chains parallel to the z axis, by O-H···O H bonds of the lengths 2.85(2) and 2.75(2) A. The N+(1)-H proton forms bifurcated H bond intramol. with O(1) and intermol. with O(2′) of the length 2.795(2) and 2.775(3) A, resp. Five of the most stable conformers of 1-piperidineacetic acid and four of its monohydrate were analyzed by B3LYP/6-31G(d,p) calculations For anhydrous acid, NPA1 conformer with intramol. N···H-O H bond is the most stable. The structure of conformer NPA1 is similar to that of the most stable conformer of N,N-dimethylglycine. The zwitterionic form, ZPA1, is stabilized by the electrostatic interaction between the pos. charged N+H and neg. charged O atoms of COO- group. ZPA1 is less stable than NPA1 and the energy difference between them is 23.8 kcal/mol. In the case of monohydrate the difference is only 4.6 kcal/mol. Addition of water mol. increases the stability of the zwitterionic form of 1-piperidineacetic acid, ZPAW3.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 1-Piperidineacetic Acid, is researched, Molecular C7H13NO2, CAS is 3235-67-4, about The hydrophobic side chain of oseltamivir influences type A subtype selectivity of neuraminidase inhibitors.Reference of 1-Piperidineacetic Acid.

Neuraminidase, which plays a critical role in the influenza virus life cycle, is a target for new therapeutic agents. The study of structure-activity relationships revealed that the C-5 position amino group of oseltamivir was pointed to 150-cavity of the neuraminidase in group 1. This cavity is important for selectivity of inhibitors against N1 vs. N2 NA. A serial of influenza neuraminidase inhibitors with the oseltamivir scaffold containing lipophilic side chains at the C-5 position have been synthesized and evaluated for their influenza neuraminidase inhibitory activity and selectivity. The results indicated that compound 13o (H5N1 IC50 = 0.1 ± 0.04 μm, H3N2 IC50 = 0.26 ± 0.18 μm) showed better inhibitory activity and selectivity against the group 1 neuraminidase. This study may provide a clue to design of better group 1 neuraminidase inhibitors.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Laihia, K.; Puszko, A.; Linnanto, J.; Kolehmainen, E. published an article about the compound: 3,5-Dimethyl-4-nitropyridine 1-oxide( cas:14248-66-9,SMILESS:O=[N+](C1=C(C)C=[N+]([O-])C=C1C)[O-] ).Recommanded Product: 3,5-Dimethyl-4-nitropyridine 1-oxide. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:14248-66-9) through the article.

Nine new and three earlier known 4-halogen (Cl and Br) substituted pyridine N-oxides have been prepared and their 1H, 13C and 15N NMR chem. shifts assigned based on PFG 1H, X (X = 13C and 15N) HMQC and HMBC experiments as well as the comparison with our earlier results for substituted pyridine N-oxide derivatives The 15N resonances of the pyridine nitrogen are 27-40 ppm more shielded in 4-halo-2-alkylamino-6-methyl-5-nitropyridine N-oxide than in parent 4-halopyridine N-oxide. According to quantum chem. ab initio HF/6-311G** calculations the amino tautomer of 4-chloro-2-methylamino-6-methyl-5-nitropyridine N-oxide is more stable than its imino form. Using B3LYP/6-311G** optimized structures both 13C and 15N shifts were calculated by d. functional B3LYP/6-311G** CSGT methods for the amino and imino tautomers as well as for the dimeric structure for 4-chloro-2-methylamino-6-methyl-5-nitropyridine N-oxide. The 15N NMR and DFT calculations suggest the prevailing of the dimeric amino form for one congener, which is further supported by ESI-TOF MS data.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

SDS of cas: 3235-67-4. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 1-Piperidineacetic Acid, is researched, Molecular C7H13NO2, CAS is 3235-67-4, about Conformational analysis of 1-piperidineacetic acid by X-ray, FTIR and ab initio calculations. Author is Dega-Szafran, Z.; Kosturkiewicz, Z.; Nowak, E.; Petryna, M.; Szafran, M..

The 1-piperidineacetic acid was synthesized as monohydrate and its structure was determined by x-ray diffraction methods. The crystals are orthorhombic, space group P212121, a 6.7693(7), b 10.816(1), c 11.452(1) A, Z = 4, R = 0.037. The acid mol. appears in the zwitterionic form with two equivalent carboxylic O atoms. The water mols. link carboxylic groups into infinite chains parallel to the z axis, by O-H···O H bonds of the lengths 2.85(2) and 2.75(2) A. The N+(1)-H proton forms bifurcated H bond intramol. with O(1) and intermol. with O(2′) of the length 2.795(2) and 2.775(3) A, resp. Five of the most stable conformers of 1-piperidineacetic acid and four of its monohydrate were analyzed by B3LYP/6-31G(d,p) calculations For anhydrous acid, NPA1 conformer with intramol. N···H-O H bond is the most stable. The structure of conformer NPA1 is similar to that of the most stable conformer of N,N-dimethylglycine. The zwitterionic form, ZPA1, is stabilized by the electrostatic interaction between the pos. charged N+H and neg. charged O atoms of COO- group. ZPA1 is less stable than NPA1 and the energy difference between them is 23.8 kcal/mol. In the case of monohydrate the difference is only 4.6 kcal/mol. Addition of water mol. increases the stability of the zwitterionic form of 1-piperidineacetic acid, ZPAW3.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis of omeprazole, published in 2002-08-31, which mentions a compound: 14248-66-9, mainly applied to omeprazole production process, Formula: C7H8N2O3.

The title compound was prepared from 5-methoxy-1H-benzimidazole-2-thiol by condensation with 2-(chloromethyl)-4-methoxy-3,5-dimethylpyridine followed by oxidation with m-chloroperoxybenzoic acid. The yield was 84.6%.

This literature about this compound(14248-66-9)Formula: C7H8N2O3has given us a lot of inspiration, and I hope that the research on this compound(3,5-Dimethyl-4-nitropyridine 1-oxide) can be further advanced. Maybe we can get more compounds in a similar way.

Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Related Products of 3235-67-4. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 1-Piperidineacetic Acid, is researched, Molecular C7H13NO2, CAS is 3235-67-4, about Two non-equivalent complexes of 1-piperidineacetic acid with 2,4-dinitrophenol studied by X-ray diffraction, PM3 and SAM1 methods and FTIR.

Crystal structure of the complex of 1-piperidineacetic acid (PAA) with 2,4-dinitrophenol (24DNP) has been solved by X-ray diffraction. The crystals are triclinic, space group Pi with a=7.178(1) A, b=11.746(2) A, c=18.118(4) A, α=84.42(3)°, β=83,34(3)°, γ=86.36(3)°, Z=4, R=0.0563. PAA forms with 24DNP two non-equivalent complexes through O···H-O hydrogen bonds of the different lengths (2.500(3) and 2.431(3) A). Each of these complexes forms a centrosym. dimer, denoted as A and B, in which two PAA moieties are joined by two N-H···O hydrogen bonds (2.875(3) and 2.797(3) A) around two different symmetry centers. The C-H···O contacts consolidate the structure in the unit cell. The structures optimized by the PM3 and SAM1 methods also reproduce two dimers A and B whose energies, dipole moments and their geometries are slightly different. The FTIR spectrum confirms the presence of the N-H···O and O-H···O hydrogen bonds.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Formula: C5H4ClNO. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 2-Chloropyridine 1-oxide, is researched, Molecular C5H4ClNO, CAS is 2402-95-1, about Heteroarene Phosphinylalkylation via a Catalytic, Polarity-Reversing Radical Cascade. Author is Buquoi, J. Quentin; Lear, Jeremy M.; Gu, Xin; Nagib, David A..

A polarity-reversing radical cascade strategy for alkene difunctionalization by vicinal C-C and C-P bond formation has been developed. This approach to concurrently adding phosphorus and a heteroarene across an olefin is enabled by photocatalytic generation of electrophilic P-centered radicals. Upon chemoselective addition to an olefin, the resulting nucleophilic C-centered radical selectively combines with electrophilic heteroarenes, such as pyridines. This multicomponent coupling scheme for phosphinylalkylation complements classic two-component methods for hydrophosphinylation of alkenes and C-H phosphinylation of arenes. Included competition and photoquenching experiments provide insight into the selectivity and mechanism of this polarity-reversal pathway.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

HPLC of Formula: 2402-95-1. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 2-Chloropyridine 1-oxide, is researched, Molecular C5H4ClNO, CAS is 2402-95-1, about Synthesis of 4-amino-2-chloropyridine.

4-Amino-2-chloropyridine was synthesized from 2-chloropyridine by oxidation with hydrogen peroxide and nitration with fuming nitric acid to give 2-chloro-4-nitropyridine-N-oxide followed by reduction in 75% overall yield.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

HPLC of Formula: 3235-67-4. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 1-Piperidineacetic Acid, is researched, Molecular C7H13NO2, CAS is 3235-67-4, about MNDO study of the preparation of substituted aminoacetate of 3-hydroxy-1,4-benzodiazepine. Author is Yao, Chunfang; Jiao, Kefang.

The esterification of 3-hydroxy-1,4-benzodiazepine(A1) with chloroacetyl chloride produced 3-hydroxy-1,4-benzodiazepine chloroacetate(A2). The authors tried to obtain substituted aminoacetate of 3-hydroxy-1,4-benzodiazepine(A3) by reacting A2 with secondary amines, but only A1 was obtained. In order to find out why the reaction yielded A1 but not A3, A2 was calculated with MNDO(modified NDDO) program. The amination mechanism was discussed with the perturbation theory of the frontier orbitals. The results showed that the effect of the frontier orbital was insignificant and the effect of the charge was significant when the reaction took place. In the amination, the yield was about 60% at the carbonyl carbon atom and only 30%-40% at the chloroalkyl carbon atom, theor. Therefore, the amination of the chloroacetate (A2) for preparing the substituted aminoacetate is probably not suitable. Finally, A3 was obtained by the esterification of A1 with the N,N-substituted aminoacetic acid in the presence of the catalyst.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Brzezinski, B.; Zundel, G. published an article about the compound: 1-Piperidineacetic Acid( cas:3235-67-4,SMILESS:OC(=O)CN1CCCCC1 ).Application In Synthesis of 1-Piperidineacetic Acid. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:3235-67-4) through the article.

IR spectra were plotted for (C5H10N)(CH2)nCOOH (n = 1-4) in CDCl3 solutions From the carboxylic bands, information is obtained on whether the proton is present at the carboxylic group or at the N atom. Furthermore, an IR continuum indicates the presence of easily-polarizable H bonds. With 1-piperidineacetic acid, the proton is found at the N atom. Intermol. asym. O-…H+N H bonds are formed, which are not easily polarizable. When n = 2-4, intramol. OH…N ⇄ O-…H+N bonds are found with the proton distributed between the O and N atoms. A double min. energy surface is present in these bonds. A strong IR continuum indicates that these H bonds are easily polarizable. With increasing concentration, the weight of the polar proton boundary structure O-…H+N increases due to interaction effects between these H bonds. These interaction effects do not occur when n = 4, as they are hindered by the hydrocarbon skeleton. In the case of intermol. OH…N ⇄ O-…H+N bonds, the IR continuums show structures in the 3200-1800 cm-1 region. These structures are not observed with the intramol. bonds, as these are shorter. Addition of water causes dissociation of the intramol. OH…N ⇄ O-…H+N H bonds.

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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem