Month: March 2024

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Synthesis of new derivatives of 1,2,5-triazepino[1,2-a]cinnoline. II. Synthesis of haloacyl derivatives of 4-oxo-1,2,3,4-tetrahydrocinnoline, published in 1992, which mentions a compound: 137195-33-6, Name is 2,3-Dihydrocinnolin-4(1H)-one hydrochloride, Molecular C8H9ClN2O, Application of 137195-33-6.

Stirring 1,2,3,4-tetrahydrocinnolin-4-one (I) with BrCH2COCl (II) in H2O at 0° gave 76% III (X = Br, R = R1 = R2 = H). III (X = Cl, R1 = R2 = H; R = Cl, Me, MeO; R = R1 = H, R2 = Cl, Me; R = H, R1 = R2 = MeO) were prepared analogously in 49-74% yields from the appropriately substituted I and ClCH2COCl (IV). When I and II were refluxed 10 h in C6H6, diacetylation occurred to give 67% V (X = Br, R1 = R2 = H). V (X = Cl, R1 = R2 = MeO; R1 = H, R2 = Cl, Me) were prepared analogously. V (X = Cl, R1 = R2 = H) was obtained from the corresponding III and IV in the presence of Et3N. Refluxing I 10 h with ClCH2CH2COCl in C6H6 gave 54% VI, which was also obtained as a byproduct when a similar reaction was carried out at 0° in CHCl3; the main product (60% yield) was 2-(3-chloropropionyl)-1,2,3,4-tetrahydrocinnolin-4-one.

《Synthesis of new derivatives of 1,2,5-triazepino[1,2-a]cinnoline. II. Synthesis of haloacyl derivatives of 4-oxo-1,2,3,4-tetrahydrocinnoline》 provides a strategy for the preparation of materials with excellent comprehensive properties, which is conducive to broaden the application field of this compound(2,3-Dihydrocinnolin-4(1H)-one hydrochloride)Application of 137195-33-6.

Reference:
Cinnoline – Wikipedia,
Cinnoline – an overview | ScienceDirect Topics

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 1416372-67-2, is researched, Molecular C5H6FN3, about Synthesis of 4-amino-5-fluoropyrimidines and 5-amino-4-fluoropyrazoles from a β-fluoroenolate salt, the main research direction is amino fluoropyrimidine preparation; amidine hydrochloride potassium cyano fluoroethenolate cyclization; fluoropyrazole amino preparation; hydrazine potassium cyano fluoroethenolate cyclization; cyclization; fluorinated heterocycles; fluorine; pyrazoles; pyrimidines.Quality Control of 5-Fluoro-2-methylpyrimidin-4-amine.

A synthesis of fluorinated pyrimidines I [R = H, OMe, Ph, etc.] under mild conditions from amidine hydrochlorides and potassium 2-cyano-2-fluoroethenolate was developed. A broad substrate scope was tested and mostly excellent yields were obtained. The synthesis of fluorinated aminopyrazoles from the same fluorinated precursor could be demonstrated but proceeded with lower efficiency.

After consulting a lot of data, we found that this compound(1416372-67-2)Quality Control of 5-Fluoro-2-methylpyrimidin-4-amine can be used in many types of reactions. And in most cases, this compound has more advantages.

Reference:
Cinnoline – Wikipedia,
Cinnoline – an overview | ScienceDirect Topics