# US 6,284,772 B1 · Indolo[2,1-B] quinazole-6,12-dione antimalarial compounds and methods of treating malaria therewith > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,284,772 B1 - Document ID: US6284772B1 - Status: Granted - Kind: B1 - Application number: 09/407,196 - Filed: 1999-09-28 - Granted: 2001-09-04 - Earliest claimed: 1998-09-30 - Assignees: The United States of America as represented by the Secretary of the Army - Inventors: Kevin K. Pitzer; John P. Scovill; Dennis E. Kyle; Lucia Gerena - Web page: https://patentgrep.com/patent/US6284772B1 ## CPC - C07D 471/14: Ortho-condensed systems - C07D 487/04: Ortho-condensed systems - C07D 487/14: Ortho-condensed systems - C07D 513/04: Ortho-condensed systems - Y02A 50/30: Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change - C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE ## Abstract Compounds, compositions and methods are provided for treating malaria parasites in vitro and in vivo by administering indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I. wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfur, with the proviso that not more than three of A, B, C, D, E, F, G and 14 are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to, the halogens (F, Cl, Br, and I), alkyl groups, trifluoromethyl groups, methoxyl groups, the carboxy methyl or carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, 1-(4-alkylpiperazinyl), and the pharmaceutically acceptable salts thereof; and wherein X is independently selected from the group consisting of any atom especially oxygen, or any side chain necessary to make the indolo[2,1 -b]quinazoline-6,12-dione compound a “prodrug” as the term is understood by one of ordinary skill in the art of medicinal chemistry. In other words, a side chain having a structure where a carbon-nitrogen double bond bears substituents that make the prodrug more water soluble and bioavailable. ## Claims ### Claim 1 An antimalarial prodrug composition comprising a pharmaceutically effective amount of one or more indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I: wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfur, with the proviso that not more than three of A, B, C, D, E, F, G and H are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to F, Cl, Br, I, alkyl groups, trifluoromethyl groups, methoxyl groups, a carboxy methyl or a carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, 1-(4-alkylpiperazinyl), and pharmaceutically acceptable salts thereof; and wherein X is a side chain rendering the indolo[2,1-b]quinazoline-6,12-dione compound a prodrug. ### Claim 2 The antimalarial prodrug of claim , comprising an indolo[2,1-b]quinazoline-6,12-dione compounds of Formula II: ### Claim 3 (depends on 1) The antimalarial prodrug of claim 1, comprising an indolo[2,1-b]quinazoline-6,12-dione compounds of Formula III: ### Claim 4 An antimalarial composition comprising a pharmaceutically effective amount of one or more indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I: wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfur, with the proviso that not more than three of A, B, C, D, E, F, G and H are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to F, Cl, Br, I, alkyl groups, trifluoromethyl groups, methoxyl groups, a carboxy methyl or a carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, 1-(4-alkylpiperazinyl), and pharmaceutically acceptable salts thereof; and wherein X is independently selected from the group consisting of oxygen and a side chain rendering the indolo[2,1-b]quinazoline-6,12-dione compound a prodrug; and one or more adjuvants. ### Claim 5 (depends on 1) The antimalarial composition of claim 1, wherein said adjuvants comprise one or more antiparasitic drug. ### Claim 6 An antimalarial composition comprising a.) a pharmaceutically effective amount of one or more indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I: wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfur, with the proviso that not more than three of A, B, C, D, E, F, G and H are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to F, Cl, Br, I, alkyl groups, trifluoromethyl groups, methoxyl groups, a carboxy methyl or a carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, 1-(4-alkylpiperazinyl), and pharmaceutically acceptable salts thereof; and wherein X is independently selected from the group consisting of oxygen and a side chain rendering the indolo[2,1-b]quinazoline-6,12-dione compound a prodrug; b.) one or more adjuvants; and c.) one or more antimalarial drugs selected from the group consisting of mefloquine, halofantrine, artesunate, artemether, chloroquine, halofantrine, primaquine, sulfadoxine, sulfalene, pyrimethamine, doxycycline, tetracycline, azithromycine, proguanil, cycloguanil, dapsone, artemsinin and atovoquone. ### Claim 7 An antimalarial composition comprising a pharmaceutically effective amount of one or more indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I: wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfur, with the proviso that not more than three of A, B, C, D, E, F, G and H are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to F, Cl, Br, I, alkyl groups, trifluoromethyl groups, methoxyl groups, a carboxy methyl or a carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, l-(4-alkylpiperazinyl), and pharmaceutically acceptable salts thereof; and wherein X is independently selected from the group consisting of oxygen and a side chain rendering the indolo[2,1l-b]quinazoline-6,12-dione compound a prodrug; and a pharmaceutically acceptable carrier. ### Claim 8 An antimalarial composition comprising a pharmaceutically effective amount of one or more indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I: wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfur, with the proviso that not more than three of A, B, C, D, E, F, G and H are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to F, Cl, Br, I, alkyl groups, trifluoromethyl groups, methoxyl groups, a carboxy methyl or a carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, 1-(4-alkylpiperazinyl), and pharmaceutically acceptable salts thereof; and wherein X is independently selected from the group consisting of oxygen and a side chain rendering the indolo [2,1 -b]quinazoline-6,12-dione compound a prodrug; and one or more pharmaceutically acceptable additive selected from the group consisting of water, Ringer's solution, isotonic sodium chloride solution, sterile fixed oils, fatty acids, cocoa butter/polyethylene glycol, sucrose, lactose, starch, lubricating agents, buffering agents or liposomes. ### Claim 9 An antimalarial composition comprising a pharmaceutically effective amount of one or more indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I: wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfuir, with the proviso that not more than three of A, B, C, D, E, F, G and H are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to F, Cl, Br, I, alkyl groups, trifluoromethyl groups, methoxyl groups, a carboxy methyl or a carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, 1-(4-alkylpiperazinyl), and pharmaceutically acceptable salts thereof; and wherein X is independently selected from the group consisting of oxygen and a side chain rendering the indolo[2,1-b]quinazoline-6,12-dione compound a prodrug; and wherein said salts are selected from the group consisting of acetate, adipate, alginate, citrate, aspartate, benzoate, benzenesulfonate, bisulfate, butyrate, camphorate, camphorsulfonate, digluconate, cyclopentanepropionate, dodecylsulfate, ethanesulfonate, glucoheptanoate, glycerophosphate, hemisulfate, heptanoate, hexanoate, fumarate, hydrochloride, bydrobromide, hydroiodide, 2-hydroxyethanesulfonate, lactate, maleate, methanesulfonate, nicotinate, 2-napthalenesulfonate, oxalate, pamoate, pectinate, persulfate, 3-phenylproionate, picrate, pivalate, propionate, succinate, tartrate, thiocyanate, p-toluenesulfonate and undecanoate. ### Claim 10 An antimalarial composition comprising a pharmaceutically effective amount of one or more indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I: wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfur, with the proviso that not more than three of A, B, C, D, E, F, G and H are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to F, Cl, Br, I, alkyl groups, trifluoromethyl groups, methoxyl groups, a carboxy methyl or a carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, 1-(4-alkylpiperazinyl), and pharmaceutically acceptable salts thereof; and wherein X is independently selected from the group consisting of oxygen and a side chain rendering the indolo[2,1-b]quinazoline-6,12-dione compound a prodrug; and wherein said composition is water soluble, oil-soluble or dispersible. ### Claim 11 An antimalarial composition comprising a pharmaceutically effective amount of one or more indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I: wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfur, with the proviso that not more than three of A, B, C, D, E, F, G and H are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to F, Cl, Br, I, alkyl groups, trifluoromethyl groups, methoxyl groups, a carboxy methyl or a carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, 1-(4-alkylpiperazinyl), and pharmaceutically acceptable salts thereof; and wherein X is independently selected from the group consisting of oxygen and a side chain rendering the indolo[2,1-b]quinazoline-6,12-dione compound a prodrug; and wherein said composition of the Formula I is in a form of a pharmaceutically acceptable acid addition salt. ### Claim 12 The antimalarial composition of claims, wherein said acid addition salt is formed with hydrochloric acid, sulphuric acid, phosphoric acid, oxalic acid, maleic acid succinic acid or citric acid. ### Claim 13 An antimalarial composition comprising a pharmaceutically effective amount of one or more indolo[2,1-b]quinazoline-6,12-dione compounds of Formula I: wherein A, B, C, D, E, F, G and H are independently selected from carbon and nitrogen, or A and B or C and D can be taken together to be nitrogen or sulfur, with the proviso that not more than three of A, B, C, D, E, F, G and H are other than carbon; wherein R1 through R8 are independently selected from the group consisting of, but not limited to F, Cl, Br, I, alkyl groups, trifluoromethyl groups, methoxyl groups, a carboxy methyl or a carboxy ethyl group (COOCH3 or COOCH2CH3), nitro, aryl, heteroaryl, cyano, amino, dialkylaminoalkyl, 1-(4-alkylpiperazinyl), and pharmaceutically acceptable salts thereof; and wherein X is independently selected from the group consisting of oxygen and a side chain rendering the indolo[2,1 -b]quinazoline-6, 1 2-dione compound a prodrug; and wherein said composition is in the form of a tablet, inhalant, parenteral injection, oral liquid, transdermal preparation, suppository or spray.