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6-Bromo-3,4-dihydro-2(1H)-quinolinone is a halogenated dihydroquinolinone derivative incorporating a bromine atom at the 6‑position of the aromatic ring, and this strategic substitution converts the parent 3,4-dihydroquinolin-2(1H)-one scaffold into a privileged pharmacophore and a versatile synthetic linchpin for medicinal chemistry and advanced organic synthesis.

3-Methyl-1-benzofuran-2-carbaldehyde, also known as 3-methylbenzofuran-2-carbaldehyde, is a 2,3-disubstituted benzofuran featuring a methyl group at the 3-position of the furan ring and a reactive aldehyde group at the 2-position, whose methyl-adjacent carbonyl and fused bicyclic structure create a rigid, π-conjugated platform for asymmetric catalysis and subsequent heterocycle formation in pharmaceutical research.

5-Chloro-3-methyl-1-benzofuran-2-carbaldehyde is a functionalized 2,3-disubstituted benzofuran featuring a chlorine atom at the 5‑position of the fused benzene ring and a methyl group at the 3‑position of the furan ring, and the combination of the electron-withdrawing chloro substituent and the methyl donor next to the reactive aldehyde handle creates a polarized, sterically tuned platform for subsequent cross‑coupling, condensation, and heterocycle formation in medicinal chemistry and materials science.

N-Thionylaniline (also known as N-sulfinylaniline or phenylthionyl imide) is an organosulfur compound characterized by a sulfinyl group (S=O) directly attached to the nitrogen atom of an aniline ring, and this electrophilic S=O–N motif, with its ambiphilic reactivity and ability to act as both a dienophile and a source of sulfur-functionalized anions, serves as a versatile linchpin for constructing heterocycles, introducing sulfur functionality into aromatic scaffolds, and enabling nucleophilic aromatic substitution in complex organic synthesis.

3,4-Dihydro-2(1H)-quinolinone (also known as 3,4-dihydroquinolin-2(1H)-one or hydrocarbostyril) is a cyclic secondary amide that features a rigid 1,2,3,4-tetrahydroquinolin-2-one skeleton containing a lactam ring fused to a benzene nucleus, and this fused, semi‑rigid structure serves as a conformationally restricted bioisostere of the 2‑aminoethylbenzamide pharmacophore for diverse biological applications.

2,3-Dimethyl-1,3-butadiene (also known as 2,3-dimethylbuta-1,3-diene) is a conjugated diene featuring two methyl substituents at the 2‑ and 3‑positions of the 1,3‑butadiene skeleton. The electron-donating methyl groups increase the electron density of the diene system, enhancing its reactivity in Diels‑Alder cycloadditions and making it a valuable monomer for the production of specialty polymers and synthetic rubber.