1513-66-2Relevant articles and documents
Tetramethylammonium Fluoride Alcohol Adducts for SNAr Fluorination
Bland, Douglas C.,Lee, So Jeong,Morales-Colón, Mariá T.,Sanford, Melanie S.,Scott, Peter J. H.,See, Yi Yang
supporting information, p. 4493 - 4498 (2021/06/28)
Nucleophilic aromatic fluorination (SNAr) is among the most common methods for the formation of C(sp2)-F bonds. Despite many recent advances, a long-standing limitation of these transformations is the requirement for rigorously dry, aprotic conditions to maintain the nucleophilicity of fluoride and suppress the generation of side products. This report addresses this challenge by leveraging tetramethylammonium fluoride alcohol adducts (Me4NF·ROH) as fluoride sources for SNAr fluorination. Through systematic tuning of the alcohol substituent (R), tetramethylammonium fluoride tert-amyl alcohol (Me4NF·t-AmylOH) was identified as an inexpensive, practical, and bench-stable reagent for SNAr fluorination under mild and convenient conditions (80 °C in DMSO, without the requirement for drying of reagents or solvent). A substrate scope of more than 50 (hetero) aryl halides and nitroarene electrophiles is demonstrated.
Selective C-H fluorination of pyridines and diazines inspired by a classic amination reaction
Fier, Patrick S.,Hartwig, John F.
, p. 956 - 960 (2013/12/04)
Fluorinated heterocycles are prevalent in pharmaceuticals, agrochemicals, and materials. However, reactions that incorporate fluorine into heteroarenes are limited in scope and can be hazardous. We present a broadly applicable and safe method for the site-selective fluorination of a single carbon-hydrogen bond in pyridines and diazines using commercially available silver(II) fluoride. The reactions occur at ambient temperature within 1 hour with exclusive selectivity for fluorination adjacent to nitrogen. The mild conditions allow access to fluorinated derivatives of medicinally important compounds, as well as a range of 2-substituted pyridines prepared by subsequent nucleophilic displacement of fluoride. Mechanistic studies demonstrate that the pathway of a classic pyridine amination can be adapted for selective fluorination of a broad range of nitrogen heterocycles.
NITROGENOUS FUSED?RING COMPOUND HAVING PYRAZOLYL GROUP AS SUBSTITUENT AND MEDICINAL COMPOSITION THEREOF
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Page 133, (2008/06/13)
The present invention provides a compound having an excellent inhibitory action on activation of STAT6 and a pharmaceutical composition thereof. Inparticular, it provides a compound represented by the following formula (I), a salt thereof or a hydrate of them. In the formula, X represents a nitrogen-containing condensed aromatic heterocyclic group such as imidazo[1,2-a]pyridine, benzimidazole, quinazoline, quinoline, or 2,1-benzisoxazole and has (R4)n as substituent groups; Y represents a C3-8 cycloalkyl group, C4-8 cycloalkenyl group, 5- to 14-membered non-aromatic heterocyclic group, C6-14 aromatic hydrocarbon cyclic group or 5- to 14-membered aromatic heterocyclic group; n in (R4)n is 0, 1, 2 or 3, and Z groups independently represent (1) hydrogen atom, (2) amino group, (3) halogen atom, (4) hydroxyl group, (5) nitro group, (6) cyano group, (7) azido group, (8) formyl group, (9) hydroxyamino group, (10) sulfamoyl group, (11) guanodino group, (12) oxo group, (13) C2-6 alkenyl group, (14) C1-6 alkoxy group, (15) C1-6 alkylhydroxyamino group, (16) halogenated C1-6 alkyl group, (17) halogenated C2-6 alkenyl group, (18) (i) C3-7cycloalkyl group, (ii) C3-7cycloalkenyl group, (iii) 5- to 14-membered non-aromatic heterocyclic group, each of which may have one or more substituent groups Q, or (19) formula -M1-M2-M3, R1 represents (1) hydrogen atom, (2) halogen atom, (3) hydroxyl group, (4) nitro group, (5) cyano group, (6) halogenated C1-6 alkyl group, (7) C2-6 alkyl group substituted with a hydroxyl or cyano group, (8) C2-6 alkenyl group, or (9) formula -L1-L2-L3, and R2 represents a hydrogen atom or a protecting group; and R3 represents a hydrogen atom, halogen atom, cyano group, amino group, C1-4 alkyl group or halogenated C1-4 alkyl group.