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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Benzoxazine, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Benzoxazine 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 Benzoxazine-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.

Benzoxazine Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(3S)-10-(4-Ethyl-1-piperazinyl)-9-fluoro-2,3-dihydro-3-methy... Stable Isotopes CS-T-97514 Not Available Enquire
5H-Pyrido[1,2,3-de]-1,4-benzoxazine-D3 Boron Derivative Stable Isotopes CS-T-102610 87531-64-4(Unlabelled) Enquire
6-Chloro-3,4-dihydro-4-methyl-3-oxo-2H-1,4-benzoxazine-8-car... Stable Isotopes CS-T-72185 1329634-37-8 Enquire
6-Chloro-3,4-dihydro-4-methyl-3-oxo-2H-1,4-benzoxazine-8-car... Stable Isotopes CS-T-72126 1795029-57-0 Enquire


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"(3S)-10-Fluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-d... Impurities CS-T-54826 117620-84-5 Enquire
"(4S)-6-Chloro-4-(2-cyclopropylethynyl)-1,4-dihydro-4-(trifl... Impurities CS-T-50688 119047-14-2 Enquire
"6,7-Dimethoxy-2H-3,1-benzoxazine-2,4(1H)-dione" Impurities CS-M-28122 20197-92-6 Enquire
"6-Iodo-2H-3,1-benzoxazine-2,4(1H)-dione" Impurities CS-M-28123 116027-10-2 Enquire
"7-Chloro-2H-3,1-benzoxazine-2,4(1H)-dione" Impurities CS-M-28127 40928-13-0 In Stock
"Ethyl 4-methyl-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylate... Impurities CS-M-33566 54442-28-3 Enquire
"Ethyl 6-chloro-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylate... Impurities CS-M-32426 68281-43-6 Enquire
2H-1,3-Benzoxazine-2,4(3H)-dione Impurities CS-CG-00145 2037-95-8 In Stock
2-Methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylic a... Impurities CS-M-30855 154365-40-9 Enquire
3,4-Dihydro-2H-1,4-benzoxazine Impurities CS-DL-00967 5735-53-5 Enquire
6,8-Dimethyl-2H-3,1-benzoxazine-2,4(1H)-dione Impurities CS-M-26959 56934-87-3 Enquire
6-Chloro-3,4-dihydro-3-oxo-2H-1,4-benzoxazine-8-carboxylic A... Impurities CS-T-50638 123040-75-5 Enquire
6-chloro-3,4-dihydro-4-methyl-3-oxo-2H-1,4-benzoxazine-8-car... Impurities CS-O-32408 123040-79-9 Enquire
Ethyl 2-methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-2-carbox... Impurities CS-M-30854 154365-33-0 Enquire
Ethyl 2-methyl-7-nitro-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-... Impurities CS-M-33643 154365-36-3 Enquire
Methyl 4-methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-7-carbo... Impurities CS-M-34563 201294-27-1 Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"1’-Boc-6-chlorospiro[4H-3,1-benzoxazine-4,4’-piperidin]-2(1... Intermediates CS-T-68692 332187-61-8 Enquire
"2,4-dioxo-2,4-dihydro-1H-3,1-benzoxazine-6-sulfonyl chlorid... Intermediates CS-EL-10151 74171-22-5 Enquire
"2-Chloro-2,2-dimethyl-2H-1,3-benzoxazine" Intermediates CS-T-50646 74405-07-5 Enquire
"2H-1,4-Benzoxazine, 3,4-dihydro-6-(4,4,5,5-tetramethyl-1,3,... Intermediates CS-AC-06321 1155264-46-2 Enquire
"2-Methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-6-carboxylic ... Intermediates CS-M-34592 1092352-65-2 Enquire
"2-Methyl-6-nitro-3,4-dihydro-2H-1,4-benzoxazine" Intermediates CS-AC-10566 174567-34-1 Enquire
"3-(3,4-dimethoxyphenethyl)-6-nitro-2H-1,3-benzoxazine-2,4(3... Intermediates CS-EL-02225 521313-27-9 Enquire
"3-(4-chlorophenyl)-6-methyl-2H-1,4-benzoxazine" Intermediates CS-EL-11583 112030-46-3 Enquire
"3,4-Dihydro-1,4-benzoxazine-3-one 6-oxoacetic Acid" Intermediates CS-T-90743 1094428-30-4 Enquire
"3,4-Dihydro-2,8-dimethyl-3-oxo-2H-1,4-benzoxazine-6-carboxa... Intermediates CS-T-89276 1246081-94-6 Enquire
"3,4-Dihydro-2H-1,4-benzoxazine-2-carbonitrile" Intermediates CS-EL-02155 86267-86-9 Enquire
"3,4-Dihydro-2H-1,4-benzoxazine-2-carboxylic Acid" Intermediates CS-T-18667 90563-93-2 Enquire
"3,4-dihydro-2H-1,4-benzoxazine-6-carboxylic acid" Intermediates CS-EL-08011 918789-44-3 Enquire
"3,4-Dihydro-2H-1,4-benzoxazine-7-boronic acid pinacol ester... Intermediates CS-T-91090 1361110-64-6 Enquire
"3,4-Dihydro-2H-1,4-benzoxazine-7-carboxylic acid" Intermediates CS-T-90363 851202-96-5 Enquire
"3-benzyl-6-nitro-2H-1,3-benzoxazine-2,4(3H)-dione" Intermediates CS-EL-00598 708231-01-0 Enquire
"3-oxo-3,4-dihydro-2H-1,4-benzoxazine-7-carboxylic acid" Intermediates CS-Q-00316 214848-62-1 Enquire
"4-[(4-chlorophenyl)sulfonyl]-3-phenyl-3,4-dihydro-2H-1,4-be... Intermediates CS-EL-11537 338962-41-7 Enquire
"4-Acetyl-3,4-dihydro-2H-1,4-benzoxazine-6-sulfonyl chloride... Intermediates CS-M-20333 1017791-37-5 Enquire
"4-BOC-6-Bromo-5-fluoro-2,3-dihydro-1,4-benzoxazine" Intermediates CS-AC-02533 1352318-72-9 Enquire
"4-Methyl-2,3-dihydro-1,4-benzoxazine-6-boronic acid" Intermediates CS-AC-05330 1015242-58-6 Enquire
"5-Fluoro-3,4-dihydro-2H-1,4-benzoxazine" Intermediates CS-T-77507 1067171-66-7 Enquire
"6-(carboxymethyl)-4-(methylsulfonyl)-3,4-dihydro-2H-1,4-ben... Intermediates CS-EL-03561 866134-50-1 Enquire
"6,8-dibromo-3-(4-fluorophenyl)-3,4-dihydro-2H-1,3-benzoxazi... Intermediates CS-EL-17675 478040-89-0 Enquire
"6-bromo-2H-3,1-benzoxazine-2,4(1H)-dione" Intermediates CS-Q-01901 4692-98-2 Enquire
"6-Bromo-8-fluoro-3,4-dihydro-2H-1,4-benzoxazine" Intermediates CS-AC-04689 1256255-94-3 Enquire
"6-Chloro-2-methyl-3,4-dihydro-2H-1,4-benzoxazine" Intermediates CS-M-26859 1082837-97-5 Enquire
"6-chloro-3-(4-nitrophenyl)-2H-1,4-benzoxazine" Intermediates CS-EL-00503 477867-74-6 Enquire
"6-chloro-4-(methylsulfonyl)-3,4-dihydro-2H-1,4-benzoxazine-... Intermediates CS-EL-05591 866134-42-1 Enquire
"6-chloro-4-[(2-nitrobenzyl)sulfonyl]-3,4-dihydro-2H-1,4-ben... Intermediates CS-EL-19183 866134-66-9 Enquire
"6-chloro-4-[(4-chlorophenyl)sulfonyl]-3,4-dihydro-2H-1,4-be... Intermediates CS-EL-06827 866134-68-1 Enquire
"6-chloro-N-(4-methylbenzyl)-4-(methylsulfonyl)-3,4-dihydro-... Intermediates CS-EL-03911 866142-52-1 Enquire
"6-Chlorospiro[4H-3,1-benzoxazine-4,4-piperidin]-2(1H)-one" Intermediates CS-DJ-00299 92926-63-1 Enquire
"7-(Trifluoromethyl)-3,4-dihydro-2H-1,4-benzoxazine-2-carbox... Intermediates CS-EL-30024 1086380-46-2 Enquire
"7-bromo-3,4-dihydro-2H-1,4-benzoxazine" Intermediates CS-AC-02706 105679-22-9 Enquire
"7-Bromo-3,4-dihydro-4-methyl-2H-1,4-benzoxazine" Intermediates CS-EL-07478 154264-95-6 Enquire
"7-fluoro-3,4-dihydro-2H-1,4-benzoxazine" Intermediates CS-EL-09930 56346-41-9 Enquire
"8-bromo-6-methoxy-3,4-dihydro-2H-1,4-benzoxazine" Intermediates CS-EL-04784 1373348-94-7 Enquire
"8-Fluoro-2,3-dihydro-1,4-benzoxazine-6-boronic acid" Intermediates CS-T-75229 1701449-28-6 Enquire
"Ethyl 3-methyl-2H-1,4-benzoxazine-2-carboxylate" Intermediates CS-AC-09344 1951441-06-7 Enquire
"methyl 2-cyano-8-methoxy-3,4-dihydro-2H-1,4-benzoxazine-6-c... Intermediates CS-EL-10133 1221792-69-3 Enquire
"Methyl 3-oxo-3,4-dihydro-2H-1,4-benzoxazine-6-carboxylate" Intermediates CS-M-34537 202195-67-3 Enquire
2-Ethyl-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-T-74562 1082930-33-3 Enquire
2-ethyl-6-methyl-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-ED-28360 898808-64-5 Enquire
2H-1,4-Benzoxazine-2,3(4H)-dione Intermediates CS-M-47313 3597-63-5 Enquire
3-Methyl-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-M-31541 32329-20-7 Enquire
3-oxo-3,4-dihydro-2H-1,4-benzoxazine-5-sulfonyl chloride Intermediates CS-ED-32659 1049652-25-6 Enquire
4-(2-bromobutanoyl)-6-methyl-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-ED-13895 1119450-35-9 Enquire
4-(Ethylsulfonyl)-3,4-dihydro-2H-1,4-benzoxazine-2-carboxyli... Intermediates CS-ED-28125 953734-90-2 Enquire
4-(furan-2-carbonyl)-3,4-dihydro-2H-1,4-benzoxazine-2-carbox... Intermediates CS-ED-30187 926258-37-9 Enquire
4-(phenylcarbamoyl)-3,4-dihydro-2H-1,4-benzoxazine-2-carboxy... Intermediates CS-ED-33383 953895-47-1 Enquire
4-[(2,5-dichlorophenyl)sulfonyl]-3-methyl-3,4-dihydro-2H-1,4... Intermediates CS-EL-16561 338747-53-8 Enquire
4-methanesulfonyl-3,4-dihydro-2H-1,4-benzoxazine-2-carboxyli... Intermediates CS-ED-20289 926241-64-7 Enquire
5,6,7,8-tetrahydro-2H-3,1-benzoxazine-2,4(1H)-dione Intermediates CS-ED-18177 108472-08-8 Enquire
5-Methyl-3-(4-methyl-1-piperazinyl)-5H-pyridazino[3,4-b][1,4... Intermediates CS-M-44135 24886-52-0 Enquire
5-Nitro-2H-3,1-benzoxazine-2,4(1H)-dione Intermediates CS-M-44122 20829-97-4 Enquire
6-(ethanesulfonyl)-2-methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxa... Intermediates CS-ED-28708 1022486-21-0 Enquire
6,7-dichloro-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-ED-27123 89938-69-2 Enquire
6,7-difluoro-2H-3,1-benzoxazine-2,4(1H)-dione Intermediates CS-ED-27473 97927-59-8 Enquire
6-Bromo-2H-1,4-benzoxazine-3(4H)-thione Intermediates CS-T-68670 1056267-89-0 Enquire
6-Bromo-4-methyl-2,3-dihydro-1,4-benzoxazine Intermediates CS-T-70641 188947-79-7 Enquire
6-Bromo-7-fluoro-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-AC-07336 1160102-28-2 Enquire
6-Chloro-2,3-dihydro-3-oxo-4H-1,4-benzoxazine-4-propionitril... Intermediates CS-O-41788 351003-20-8 Enquire
6-Chloro-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-M-33916 70558-11-1 Enquire
6-Fluoro-4-methyl-2,3-dihydro-1,4-benzoxazine Intermediates CS-T-75615 1267334-42-8 Enquire
6-Fluorospiro[4H-3,1-benzoxazine-4,4'-piperidin]-2(1H)-one Intermediates CS-M-55017 92926-32-4 Enquire
6-Methyl-2,3-dihydro-3-oxo-4H-1,4-benzoxazine-4-propionitril... Intermediates CS-O-41874 351003-19-5 Enquire
6-Nitro-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-M-31780 28226-22-4 Enquire
7-bromo-6-chloro-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-ED-18286 105679-33-2 Enquire
7-Bromo-6-fluoro-2H-3,1-benzoxazine-2,4(1H)-dione Intermediates CS-ED-13345 1887002-15-4 Enquire
7-Chloro-2-methyl-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-T-69246 1173183-85-1 Enquire
7-Nitro-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-M-33788 120711-81-1 Enquire
8-Fluoro-3,4-dihydro-2H-1,4-benzoxazine Intermediates CS-T-75096 898832-40-1 Enquire
9,10-Difluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de]... Intermediates CS-T-91150 82419-35-0 In Stock
Ethyl 3,4-dihydro-2H-1,4-benzoxazine-2-carboxylate Intermediates CS-M-32228 22244-22-0 Enquire
ethyl 4-methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-6-carbox... Intermediates CS-ED-28503 951464-90-7 Enquire
Methyl 3,4-dihydro-2H-1,4-benzoxazine-6-carboxylate Intermediates CS-M-34420 758684-29-6 Enquire
methyl 4-(2-chloroacetyl)-3,4-dihydro-2H-1,4-benzoxazine-2-c... Intermediates CS-ED-20629 949980-36-3 Enquire
N-methyl-3,4-dihydro-2H-1,4-benzoxazine-2-carboxamide Intermediates CS-ED-30899 91842-95-4 Enquire
Octahydro-2H-1,4-benzoxazine hydrobromide Intermediates CS-M-44314 74572-19-3 Enquire
Spiro[4H-3,1-benzoxazine-4,4'-piperidin]-2(1H)-one Intermediates CS-M-55018 84060-09-3 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Alanine Benzyl Ester Hydrochloride Fine Chemicals CS-O-11255 5557-83-5 In Stock


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-(tert-Butyl)-3,4-dihydro-2H-1,4-benzoxazine Building Blocks CS-M-31894 32278-16-3 Enquire