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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Quinazoline, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Quinazoline impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Quinazoline-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Quinazoline Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Methyl 8-fluoro-3,4-dihydro-2-[4-[3-(methoxy-d3)phenyl]-1-pi... Stable Isotopes CS-O-48629 1961287-80-8 Enquire
Methyl 8-Fluoro-3,4-Dihydro-2-[4-[3-(Methoxy-d3)Phenyl]-1-Pi... Stable Isotopes CS-O-48635 1961287-64-8 In Stock
2-Piperazinyl-4-amino-6,7-dimethoxyquinazoline-d8 Stable Isotopes CS-T-84260 1246820-89-2 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-(1-Ethyl-1H-pyrazol-4-yl)[1,2,4]triazolo[1,5-c]quinazoline Impurity CS-O-57102 1005691-67-7 Enquire
2-(1-Methyl-1H-pyrazol-4-yl)[1,2,4]triazolo[1,5-c]quinazolin... Impurity CS-O-57100 1005643-71-9 Enquire
2-(1-Methyl-1H-pyrazol-5-yl)[1,2,4]triazolo[1,5-c]quinazolin... Impurity CS-O-57112 1005692-07-8 Enquire
2-[1-[(4-Chlorophenoxy)methyl]-1H-pyrazol-5-yl][1,2,4]triazo... Impurity CS-O-57099 1005562-82-2 Enquire
4-Amino-6,7dimethoxy-2-(1-piperazinyl)quinazoline dihydrochl... Impurity CS-O-55062 ---- Enquire
9-Fluoro-2-(3-pyridinyl)[1,2,4]triazolo[1,5-c]quinazoline Impurity CS-O-57101 1324056-91-8 Enquire
9-Fluoro-2-(4-pyridinyl)[1,2,4]triazolo[1,5-c]quinazoline Impurity CS-O-57098 1324059-08-6 Enquire
Linagliptin Chloroquinazoline impurity Impurity CS-O-47202 2638512-67-9 Enquire
N6-(4,4-dimethyl-4,5-dihydrooxazol-2-yl)quinazoline-4,6-diam... Impurity CS-O-44117 Not Available Enquire
Repaglinide Quinazoline Impuriy A Impurity CS-O-46913 Not Available Enquire
Repaglinide Quinazoline Impuriy B Impurity CS-O-46914 Not Available Enquire
Rosuvastatin Dihydrobenzoquinazoline (3R,5R,6RS)-Isomer Impurity CS-O-56157 Not Available Enquire
Rosuvastatin Dihydrobenzoquinazoline (6S)-Isomer Impurity CS-O-38626 854898-53-6 In Stock
1,2,3,4-Tetrahydro-4-oxo-2-thioxo-7-quinazolinecarboxylic Ac... Impurity CS-T-86637 422277-15-4 Enquire
1,3-Dimethyl-2,4-dioxo-1,2,3,4-tetrahydro-quinazoline-6-sulf... Impurity CS-M-10311 773877-44-4 Enquire
11-Oxo-11H-pyrido[2,1-b]quinazoline-6-carboxylic acid Impurity CS-M-07683 4393-98-0 Enquire
2-(Chloromethyl)-6-methyl-4-phenyl-quinazoline 3-Oxide Impurity CS-T-50824 94206-84-5 Enquire
2-Amino-5,6-dichloro-3(4H)-quinazoline Acetic Acid Benzyl Es... Impurity CS-T-65729 1391053-41-0 Enquire
2-Amino-5,6-dichloro-3(4H)-quinazoline Acetic Acid Hydrobrom... Impurity CS-T-47745 1194434-39-3 Enquire
2-Amino-5,6-dichloro-3(4H)-quinazolineacetic Acid Methyl Est... Impurity CS-T-65848 70380-52-8 Enquire
2-Chloro-6,7-dimethoxyquinazoline Impurity CS-DJ-00426 94644-47-0 Enquire
2-Chloromethyl-3-oxo-4-methyl quinazoline Impurity CS-O-40456 6640-59-1 Enquire
2-Chloro-N-[4-chloro-2-[(hydroxyimino)phenylmethyl]phenyl]ac... Impurity CS-O-16286 17977-76-3 In Stock
3-(3-Chlorophenyl)quinazoline-2,4(1H,3H)-dione Impurity CS-M-47483 2473-93-0 Enquire
3-(4-Chlorophenyl)quinazoline-2,4(1H,3H)-dione Impurity CS-M-47482 2400-95-5 Enquire
3,4-Dihydro-4-oxo-2-quinazolinepropionic Acid Impurity CS-T-53104 5368-37-6 Enquire
3-Ethylquinazoline-2,4(1H,3H)-dione Impurity CS-M-47481 2217-26-7 Enquire
4-chloro-6-(3-chloropropoxy)-7-methoxyquinazoline Impurity CS-O-39486 692059-41-9 Enquire
4-Chloro-6-hydroxy-7-methoxyquinazoline Impurity CS-M-51712 574745-97-4 Enquire
4-Chloro-7-(2-chloroethoxy)-6-(2-methoxyethoxy)quinazoline Impurity CS-T-11327 183322-20-5 Enquire
4-Chloro-quinazoline Impurity CS-M-07614 5190-68-1 Enquire
4-Methyl-2-quinazolinecarboxylic Acid Ethyl Ester Impurity CS-T-81122 68674-74-8 Enquire
4-oxo-3,4-dihydro-quinazoline-6-carboxylic acid Impurity CS-DV-02897 33986-75-3 Enquire
4-Piperazin-1-ylquinazoline Impurity CS-M-26957 59215-41-7 Enquire
5,6,7,8-Tetrahydro-quinazoline Impurity CS-DV-02975 5632-33-7 Enquire
5-Bromo-2,4-dichloroquinazoline Impurity CS-DV-03032 134517-54-7 Enquire
6,7-Dimethoxy-N2,N2-dimethylquinazoline-2,4-diamine Impurity CS-T-91040 19216-53-6 Enquire
6-Bromo-2,4-dichloroquinazoline Impurity CS-M-52005 102393-82-8 Enquire
6-Chloro-2-(chloromethyl)-4-(2-fluorophenyl)-1,2-dihydroquin... Impurity CS-T-11511 60656-72-6 Enquire
7-Methoxy-4-(pyridin-3-yl)-6-[2-(quinolin-2-yl)ethoxy]quinaz... Impurity CS-T-32868 1006890-01-2 Enquire
copanlisib imidazo[1,2-c]quinazoline N-oxide Impurity CS-O-32746 Not Available Enquire
Methyl 4-chloroquinazoline-6-carboxylate Impurity CS-M-51727 152536-17-9 Enquire
Quinazoline-7-carboxylic Acid Impurity CS-T-84953 1234616-41-1 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(S)-N4-(3-Chloro-4-fluorophenyl)-7-((tetrahydrofuran-3-yl)ox... Intermediate CS-O-13076 314771-76-1 In Stock
2-(chloromethyl)-4-methylquinazoline Intermediate CS-O-31217 109113-72-6 In Stock
4-chloro-2-(4-chlorophenyl)-6,7,8-trimethoxyquinazoline Intermediate CS-O-55431 228118-54-5 Enquire
4-chloro-6,7,8-trimethoxy-2-(4-methoxyphenyl)quinazoline Intermediate CS-O-55430 71694-84-3 Enquire
4-chloro-6,7,8-trimethoxy-2-(pyridin-3-yl)quinazoline Intermediate CS-O-55428 1623478-63-6 Enquire
4-chloro-6,7,8-trimethoxy-2-phenylquinazoline Intermediate CS-O-55427 52515-82-9 Enquire
6,7-Dimethoxy-2,4-quinazolinediamine Intermediate CS-T-18546 60547-96-8 In Stock
Methyl 8-fluoro-3,4-dihydro-2-[4-(3-methoxyphenyl)-1-piperaz... Intermediate CS-O-48636 791117-40-3 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Methylquinazoline Fine Chemicals CS-ED-42030 700-79-8 Enquire
4-Chloro-6,7-Bis-(2-methoxyethoxy)-4(3H)-quinazoline Fine Chemicals CS-O-31360 183322-18-1 In Stock
4-Chloro-7-methoxy-6-nitroquinazoline Fine Chemicals CS-MM-60922 55496-69-0 In Stock
4-Chloroquinazoline-6,7-diol Fine Chemicals CS-O-54452 1145671-36-8 Enquire
6,7-Dimethoxyquinazoline Fine Chemicals CS-O-54453 4101-33-1 Enquire
2,4-Dichloro-5-fluoroquinazoline Fine Chemicals CS-DJ-00880 87611-00-5 Enquire
4-Amino-2-methylthio-quinazoline Fine Chemicals CS-H-00062 63963-40-6 Enquire
4-Amino-5-fluoroquinazoline Fine Chemicals CS-M-00442 137553-48-1 Enquire
4-Bromoquinazoline Fine Chemicals CS-M-55984 354574-59-7 Enquire
4-Chloro-6-(trifluoromethyl)quinazoline Fine Chemicals CS-MM-26859 16499-64-2 Enquire
5-Fluoro-2,4-quinazolinediamine Fine Chemicals CS-M-02031 119584-70-2 Enquire
5-Fluoro-4-hydroxyquinazoline Fine Chemicals CS-M-00971 436-72-6 Enquire
6-Bromoquinazoline Fine Chemicals CS-M-51684 89892-21-7 Enquire
6-chloro-4-(2-chlorophenyl)-2-quinazoline-2-carboxylic acid Fine Chemicals CS-O-38335 54643-79-7 Enquire
6-Iodoquinazoline Fine Chemicals CS-M-54848 848841-54-3 Enquire
6-nitroquinazoline Fine Chemicals CS-ED-01466 7556-95-8 Enquire
7-Bromoquinazoline Fine Chemicals CS-M-51685 89892-22-8 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4-Chloro-2-(trifluoromethyl)quinazoline Building Blocks CS-M-30299 52353-35-2 Enquire
4-Chloro-7-(trifluoromethyl)quinazoline Building Blocks CS-M-55214 16499-65-3 Enquire
5-Methoxy-quinazoline-2,4-diamine Building Blocks CS-TC-03173 27018-21-9 Enquire
Fmoc-3-(2-aminoethyl)-1-carboxymethyl-quinazoline-2,4-dione Building Blocks CS-T-74329 204322-92-9 Enquire
Methyl 3,4-dihydro-6-iodo-4-oxoquinazoline-8-carbpxylate Building Blocks CS-O-47609 1240480-09-4 Enquire
Methyl 6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-4-qui... Building Blocks CS-O-47591 2411739-61-0 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N6-[(3,4-Dichlorophenyl)methyl]-N6-nitroso-2,4,6-quinazoline... Nitrosamine CS-T-88906 22316-71-8 Enquire