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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
2-Piperazinyl-4-amino-6,7-dimethoxyquinazoline-d8 Stable Isotopes CS-T-84260 1246820-89-2 Enquire
Methyl 8-fluoro-3,4-dihydro-2-[4-[3-(methoxy-d3)phenyl]-1-pi... Stable Isotopes CS-O-48629 1961287-80-8 Enquire


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"1,2,3,4-Tetrahydro-4-oxo-2-thioxo-7-quinazolinecarboxylic A... Impurities CS-T-86637 422277-15-4 Enquire
"11-Oxo-11H-pyrido[2,1-b]quinazoline-6-carboxylic acid" Impurities CS-M-07683 4393-98-0 Enquire
"2-Amino-5,6-dichloro-3(4H)-quinazoline Acetic Acid Benzyl E... Impurities CS-T-65729 1391053-41-0 Enquire
"2-Amino-5,6-dichloro-3(4H)-quinazoline Acetic Acid Hydrobro... Impurities CS-T-47745 1194434-39-3 Enquire
"2-Amino-5,6-dichloro-3(4H)-quinazolineacetic Acid Methyl Es... Impurities CS-T-65848 70380-52-8 Enquire
"2-Chloro-6,7-dimethoxyquinazoline" Impurities CS-DJ-00426 94644-47-0 Enquire
"3-(3-Chlorophenyl)quinazoline-2,4(1H,3H)-dione" Impurities CS-M-47483 2473-93-0 Enquire
"4-oxo-3,4-dihydro-quinazoline-6-carboxylic acid" Impurities CS-DV-02897 33986-75-3 Enquire
"5-Bromo-2,4-dichloroquinazoline" Impurities CS-DV-03032 134517-54-7 Enquire
"6,7-Dimethoxy-N2,N2-dimethylquinazoline-2,4-diamine" Impurities CS-T-91040 19216-53-6 Enquire
"6-Bromo-2,4-dichloroquinazoline" Impurities CS-M-52005 102393-82-8 Enquire
"6-Chloro-2-(chloromethyl)-4-(2-fluorophenyl)-1,2-dihydroqui... Impurities CS-T-11511 60656-72-6 Enquire
1,3-Dimethyl-2,4-dioxo-1,2,3,4-tetrahydro-quinazoline-6-sulf... Impurities CS-M-10311 773877-44-4 Enquire
2-(1-Ethyl-1H-pyrazol-4-yl)[1,2,4]triazolo[1,5-c]quinazoline Impurities CS-O-57102 1005691-67-7 Enquire
2-(1-Methyl-1H-pyrazol-4-yl)[1,2,4]triazolo[1,5-c]quinazolin... Impurities CS-O-57100 1005643-71-9 Enquire
2-(1-Methyl-1H-pyrazol-5-yl)[1,2,4]triazolo[1,5-c]quinazolin... Impurities CS-O-57112 1005692-07-8 Enquire
2-(Chloromethyl)-6-methyl-4-phenyl-quinazoline 3-Oxide Impurities CS-T-50824 94206-84-5 Enquire
2-[1-[(4-Chlorophenoxy)methyl]-1H-pyrazol-5-yl][1,2,4]triazo... Impurities CS-O-57099 1005562-82-2 Enquire
2-Amino-5,6-dichloro-3(4H)-quinazoline Acetic Acid Impurities CS-T-47744 1159977-03-3 Enquire
2-Chloromethyl-3-oxo-4-methyl quinazoline Impurities CS-O-40456 6640-59-1 Enquire
2-Chloro-N-[4-chloro-2-[(hydroxyimino)phenylmethyl]phenyl]ac... Impurities CS-O-16286 17977-76-3 In Stock
3,4-Dihydro-4-oxo-2-quinazolinepropionic Acid Impurities CS-T-53104 5368-37-6 Enquire
4-Amino-6,7dimethoxy-2-(1-piperazinyl)quinazoline dihydrochl... Impurities CS-O-55062 Not Available Enquire
4-chloro-6-(3-chloropropoxy)-7-methoxyquinazoline Impurities CS-O-39486 692059-41-9 Enquire
4-Chloro-6-hydroxy-7-methoxyquinazoline Impurities CS-M-51712 574745-97-4 Enquire
4-Chloro-7-(2-chloroethoxy)-6-(2-methoxyethoxy)quinazoline Impurities CS-T-11327 183322-20-5 Enquire
4-Chloro-quinazoline Impurities CS-M-07614 5190-68-1 Enquire
4-Methyl-2-quinazolinecarboxylic Acid Ethyl Ester Impurities CS-T-81122 68674-74-8 Enquire
4-Piperazin-1-ylquinazoline Impurities CS-M-26957 59215-41-7 Enquire
5,6,7,8-Tetrahydro-quinazoline Impurities CS-DV-02975 5632-33-7 Enquire
7-Methoxy-4-(pyridin-3-yl)-6-[2-(quinolin-2-yl)ethoxy]quinaz... Impurities CS-T-32868 1006890-01-2 Enquire
9-Fluoro-2-(3-pyridinyl)[1,2,4]triazolo[1,5-c]quinazoline Impurities CS-O-57101 1324056-91-8 Enquire
9-Fluoro-2-(4-pyridinyl)[1,2,4]triazolo[1,5-c]quinazoline Impurities CS-O-57098 1324059-08-6 Enquire
copanlisib imidazo[1,2-c]quinazoline N-oxide Impurities CS-O-32746 Not Available Enquire
Methyl 4-chloroquinazoline-6-carboxylate Impurities CS-M-51727 152536-17-9 Enquire
N6-(4,4-dimethyl-4,5-dihydrooxazol-2-yl)quinazoline-4,6-diam... Impurities CS-O-44117 Not Available Enquire
N6-[(3,4-Dichlorophenyl)methyl]-N6-nitroso-2,4,6-quinazoline... Impurities CS-T-88906 22316-71-8 Enquire
Quinazoline-7-carboxylic Acid Impurities CS-T-84953 1234616-41-1 Enquire
Rosuvastatin Dihydrobenzoquinazoline (3R,5R,6RS)-Isomer Impurities CS-O-56157 Not Available Enquire
Rosuvastatin Dihydrobenzoquinazoline (6S)-Isomer Impurities CS-O-38626 854898-53-6 In Stock


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"1-methyl-2-pentyl-2H-pyrazino[2,1-b]quinazoline-3,6(1H,4H)-... Intermediates CS-EL-28993 866010-14-2 Enquire
"2-(cyanomethyl)-6-oxo-6,7,8,9-tetrahydropyrazolo[1,5-a]quin... Intermediates CS-EL-05112 860784-91-4 Enquire
"2,4(1H,3H)-Quinazolinedione" Intermediates CS-AC-12585 86-96-4 Enquire
"2,4-Diamino-5,6,7,8-tetrahydro-6-quinazolinecarboxylic Acid... Intermediates CS-T-52458 6974-25-0 Enquire
"2,4-Dichloro-5,6,7,8-tetrahydroquinazoline" Intermediates CS-M-56980 1127-85-1 Enquire
"2,4-dichloro-6-(trifluoromethyl)quinazoline" Intermediates CS-BO-00097 864291-30-5 Enquire
"2,4-Dichloro-6-fluoroquinazoline" Intermediates CS-M-42361 134517-57-0 Enquire
"2,4-Dichloro-6-methoxyquinazoline" Intermediates CS-M-42375 105763-77-7 Enquire
"2,4-dichloro-6-methylquinazoline" Intermediates CS-BO-00063 39576-82-4 Enquire
"2,4-Dichloro-7-fluoroquinazoline" Intermediates CS-M-42369 174566-15-5 Enquire
"2,4-dichloro-8-fluoroquinazoline" Intermediates CS-BO-00076 959237-64-0 Enquire
"2,4-Dichloro-8-methoxyquinazoline" Intermediates CS-T-17539 61948-60-5 Enquire
"2,4-dichloro-8-methylquinazoline" Intermediates CS-EL-09043 39576-83-5 Enquire
"2,4-Dichloroquinazoline" Intermediates CS-T-91246 607-68-1 Enquire
"2,4-Dihydroxyl-6-fluoroquinazoline" Intermediates CS-M-42362 88145-90-8 Enquire
"2,4-Dimethylquinazoline" Intermediates CS-M-57620 703-63-9 Enquire
"2,6-Dibromoquinazoline" Intermediates CS-T-88291 161425-75-8 Enquire
"2,8-Dichloroquinazoline" Intermediates CS-EL-09567 67092-20-0 Enquire
"2-Amino-5,6-dichloro-3,4-dihydroquinazoline Hydrobromide" Intermediates CS-T-02393 327602-34-6 Enquire
"2-Amino-5,6-dichloro-3,4-dihydroquinazoline" Intermediates CS-T-02394 444904-63-6 Enquire
"2-Oxo-1,2-dihydroquinazoline-4-carboxylic acid" Intermediates CS-M-42376 99066-77-0 Enquire
"3-(2,4-dichlorophenyl)-5-piperidino[1,2,4]triazolo[4,3-c]qu... Intermediates CS-EL-17394 338977-92-7 Enquire
"3-(4-chlorophenyl)-4-imino-3,4-dihydro-2(1H)-quinazolinethi... Intermediates CS-EL-13263 477889-21-7 Enquire
"3-(4-chlorophenyl)-4-imino-6-(4-methoxyphenyl)-1,3,7-trihyd... Intermediates CS-EL-13045 379707-94-5 Enquire
"3-(4-chlorophenyl)-5-methyl-6,7,8,9-tetrahydropyrazolo[1,5-... Intermediates CS-EL-30356 866018-13-5 Enquire
"3,4-Dihydro-4-oxoquinazoline-6-carboxylic acid" Intermediates CS-M-53230 1194374-07-6 Enquire
"3-allylquinazoline-2,4(1H,3H)-dione" Intermediates CS-EL-01469 10341-86-3 Enquire
"4-(1,4-diazepan-1-yl)-2-(trifluoromethyl)quinazoline" Intermediates CS-EL-01759 1190198-38-9 Enquire
"4-(2,4-difluorophenoxy)-2-(trifluoromethyl)quinazoline" Intermediates CS-EL-17951 337924-97-7 Enquire
"4-(4-bromophenyl)-2-(3,5-dimethyl-1H-pyrazol-1-yl)-5,6-dihy... Intermediates CS-EL-18584 956965-83-6 Enquire
"4,6-Dichloro-2-(trifluoromethyl)quinazoline" Intermediates CS-M-57555 746671-32-9 Enquire
"4,6-Dichloro-2-methylquinazoline" Intermediates CS-EL-01864 338739-44-9 Enquire
"4,7-dichloroquinazoline" Intermediates CS-BO-00119 2148-57-4 Enquire
"4-[(2,4-dichlorophenyl)sulfanyl]-2-[(4-methylbenzyl)sulfany... Intermediates CS-EL-18032 866049-14-1 Enquire
"4-chloro-2-[(4-methylbenzyl)sulfanyl]-5,6,7,8-tetrahydroqui... Intermediates CS-EL-18114 338963-39-6 Enquire
"4-chloro-2-[(4-methylbenzyl)sulfonyl]-5,6,7,8-tetrahydroqui... Intermediates CS-EL-18417 672951-61-0 Enquire
"4-Chloro-5,6,7,8-tetrahydroquinazoline" Intermediates CS-AC-10985 1125-62-8 Enquire
"4-Chloro-6,7-dimethylenedioxyquinazoline" Intermediates CS-EL-02590 52791-05-6 Enquire
"4-oxo-3,4-dihydroquinazoline-7-carboxylic acid" Intermediates CS-BO-00086 202197-73-7 Enquire
"4-oxo-3,4-dihydroquinazoline-8-carboxylic acid" Intermediates CS-BO-00091 19181-77-2 Enquire
"5-(4-Tolylthio)-2,4-diaminoquinazoline" Intermediates CS-T-62136 168910-32-5 Enquire
"5-[(2,4-dichlorobenzyl)sulfanyl]-8,9-dimethoxy-2-methyl[1,2... Intermediates CS-EL-15671 860611-22-9 Enquire
"5-Chloro-2,4-diaminoquinazoline" Intermediates CS-CE-00282 17511-21-6 Enquire
"5-methyl-11-oxo-5,6,7,8,9,11-hexahydro-5aH-pyrido[2,1-b]qui... Intermediates CS-EL-29940 1574582-11-8 Enquire
"5-piperidinopyrazolo[1,5-a]quinazoline-3-carbonitrile" Intermediates CS-EL-29216 124570-60-1 Enquire
"6,7-Dimethoxy-2-(l-piperazinyl)-Quinazoline" Intermediates CS-O-31344 104966-39-4 Enquire
"6,7-Dimethoxy-4-piperazin-1-yl-quinazoline" Intermediates CS-M-54880 21584-72-5 Enquire
"6-Bromo-2,4(1H,3H)-quinazolinedione" Intermediates CS-M-34082 88145-89-5 Enquire
"6-bromo-3-ethyl-2,4(1H,3H)-quinazolinedione" Intermediates CS-EL-05951 377067-64-6 Enquire
"6-Bromo-3-phenyl-2,4(1H,3H)-quinazolinedione" Intermediates CS-M-34790 23965-11-9 Enquire
"6-bromo-3-propyl-2,4(1H,3H)-quinazolinedione" Intermediates CS-EL-00526 200938-70-1 Enquire
"6-Chloroquinazoline-2,4-dione" Intermediates CS-AC-12560 1640-60-4 Enquire
"6-Phenyl-benzimidazol(1,2-c)quinazoline" Intermediates CS-AC-10923 28381-92-2 Enquire
"7-amino-4-oxo-5-phenyl-2-thioxo-1,3,5,8-tetrahydro-8-oxaqui... Intermediates CS-EL-02540 112434-50-1 Enquire
"7-amino-5-(3-nitrophenyl)-2,4-dioxo-1,3,5,8-tetrahydro-8-ox... Intermediates CS-EL-31694 94988-66-6 Enquire
"7-Bromo-2,4-diaminoquinazoline" Intermediates CS-AC-02539 137553-43-6 Enquire
"7-Bromo-2,4-dichloroquinazoline" Intermediates CS-DJ-00522 959237-68-4 Enquire
"7-bromo-4,6-dichloroquinazoline" Intermediates CS-EM-03410 1260847-61-7 Enquire
"7-bromoquinazoline-2,4-diol" Intermediates CS-BO-00104 114703-12-7 Enquire
"7-Chloro-1H-quinazoline-2,4-dione" Intermediates CS-AC-12567 13165-35-0 Enquire
"7-chloro-2-ethyl-4,4-dioxo-1,2,3-trihydro-4-thiaquinazoline... Intermediates CS-EL-03557 1824-58-4 Enquire
"7-Fluoro-1,3-dihydroquinazoline-2,4-dione" Intermediates CS-AC-11479 76088-98-7 Enquire
"7-Nitroquinazoline-2,4(1H,3H)-dione" Intermediates CS-T-82999 174565-63-0 Enquire
"8,9-Dihydro-spiro[7H-cyclopenta[f]quinazoline-7,2’-[1,3]dit... Intermediates CS-T-90063 103494-99-1 Enquire
"8,9-dimethoxy-5-[(3-methoxybenzyl)sulfanyl]-2-methyl[1,2,4]... Intermediates CS-EL-17072 860650-27-7 Enquire
"8-Bromo-2,4-dichloroquinazoline" Intermediates CS-M-42370 331647-05-3 Enquire
"8-bromoquinazoline-2,4-diol" Intermediates CS-BO-00113 331646-99-2 Enquire
"8-Fluoro-2,4(1H,3H)-quinazolinedione" Intermediates CS-DJ-00521 959236-96-5 Enquire
"9-Trifluoromethyl-5,6,7,8-tetrahydro-pyrazolo-[5,1-b]quinaz... Intermediates CS-M-05682 436088-43-6 Enquire
"Boc-3-(2-aminoethyl)-1-carboxymethyl-quinazoline-2,4-dione" Intermediates CS-T-67799 215190-30-0 Enquire
"ethyl 2,4-dioxo-1,2,3,4-tetrahydroquinazoline-6-carboxylate... Intermediates CS-BO-00090 1207175-71-0 Enquire
"Ethyl 4-oxo-3,4-dihydroquinazoline-6-carboxylate" Intermediates CS-M-53012 155960-91-1 Enquire
"methyl 2,4-dichloroquinazoline-7-carboxylate" Intermediates CS-BO-00062 174074-89-6 Enquire
(S)-N4-(3-Chloro-4-fluorophenyl)-7-((tetrahydrofuran-3-yl)ox... Intermediates CS-O-13076 314771-76-1 In Stock
1-(2-aminoethyl)-3-methylquinazoline-2,4(1H,3H)-dione hydroc... Intermediates CS-ED-35626 1211465-14-3 Enquire
1,3-Dimethyl-2,4-dioxo-1,2,3,4-tetrahydroquinazoline-6-carbo... Intermediates CS-ED-26036 924843-71-0 Enquire
12-Oxo-6,7,8,9,10,12-hexahydroazepino[2,1-b]quinazoline-3-ca... Intermediates CS-ED-32691 108561-87-1 Enquire
2-(3-chlorobenzyl)-4-(2-propynylsulfanyl)quinazoline Intermediates CS-EL-18272 400075-32-3 Enquire
2-(4-Bromophenyl)-4,6-dichloroquinazoline Intermediates CS-ED-14904 405933-98-4 Enquire
2-(4-Bromophenyl)-4,7-dichloroquinazoline Intermediates CS-ED-14903 405933-94-0 Enquire
2-(4-chlorobenzyl)-4-quinazolinethiol Intermediates CS-EL-00978 303149-23-7 Enquire
2-(Azetidin-1-yl)-4-chloroquinazoline Intermediates CS-ED-37583 2098118-06-8 Enquire
2-(chloromethyl)-4-methylquinazoline Intermediates CS-O-31217 109113-72-6 In Stock
2-(Furan-2-yl)quinazoline-4-thiol Intermediates CS-ED-30232 923853-12-7 Enquire
2-(Morpholin-4-ylmethyl)quinazoline-4-thiol Intermediates CS-ED-20622 923711-94-8 Enquire
2,4(1H,3H)-Quinazolinedione, 3-(2-aminoethyl)- Intermediates CS-ED-39346 144734-40-7 Enquire
2,4-Dibromoquinazoline Intermediates CS-M-54941 872998-61-3 Enquire
2,4-Dichloro-8-iodoquinazoline Intermediates CS-ED-25321 959237-40-2 Enquire
2,4-Dioxo-1,2,3,4-tetrahydro-5-quinazolinecarboxylic acid Intermediates CS-M-41327 5715-10-6 Enquire
2,4-Dioxo-3-(propan-2-yl)-1,2,3,4-tetrahydroquinazoline-7-ca... Intermediates CS-ED-17157 1087784-73-3 Enquire
2,4-Quinazolinediamine, N2-(cis-4-((2-(4-bromo-2-(trifluorom... Intermediates CS-ED-11739 510732-84-0 Enquire
2-[(Dimethylamino)methyl]quinazoline-4-thiol Intermediates CS-ED-17708 923140-47-0 Enquire
2-Amino-5,6,7,8-tetrahydro-4-quinazolinecarboxylic acid Intermediates CS-ED-10440 51640-97-2 Enquire
2-Amino-5,6-dichloro-3(4H)-quinazoline Acetic Acid Ethyl Est... Intermediates CS-T-47746 70381-75-8 Enquire
2-Amino-7-chloroquinazoline Intermediates CS-ED-04052 190274-08-9 Enquire
2-Amino-8-methoxyquinazoline Intermediates CS-ED-05936 708-15-6 Enquire
2-Aminoquinazoline Intermediates CS-T-66538 1687-51-0 Enquire
2-Bromo-5,6,7,8-tetrahydro-4-(trifluoromethyl)quinazoline Intermediates CS-ED-16972 933673-57-5 Enquire
2-Chloro-4-phenylquinazoline Intermediates CS-AC-12480 29874-83-7 Enquire
2-chloro-6-fluoroquinazoline Intermediates CS-BO-00202 113082-27-2 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Methylquinazoline Fine Chemicals CS-ED-42030 700-79-8 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
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
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-nitroquinazoline Fine Chemicals CS-ED-01466 7556-95-8 Enquire
7-Bromoquinazoline Fine Chemicals CS-M-51685 89892-22-8 Enquire
N4-(3-Chloro-4-fluorophenyl)-7-methoxyquinazoline-4,6-diamin... Fine Chemicals CS-O-35196 179552-75-1 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
Fmoc-3-(2-aminoethyl)-1-carboxymethyl-quinazoline-2,4-dione Building Blocks CS-T-74329 204322-92-9 Enquire