Patent GB-634818-A (GB)
Title: Quinoline derivatives
IPC: C07D215/42
Filed: 1947-08-22
Abstract: Mono- and di-quaternary salts of pyrimidylaminoquinolines, possessing trypanocidal activity and of the general formula Pq-NH-A, (wherein P represents a 2-, 4- (or 6-) amino-substituted pyrimidine nucleus which is attached to the -NH- linkage at another of the 2-, 4- (or 6-) positions and which may be further substituted in the remaining 2-, 4- (or 6-) position by an alkyl radical of not more than 5 carbon atoms or an amino group, A represents Q or Qq where Q is a quinoline nucleus which is substituted in the 2- or 4- position by an amino group and may be further substituted by an alkyl group of not more than 5 carbon atoms, and which bears the linking-NH- group in the 6-position, and the symbols q indicate that the preceding nuclei P and Q respectively are in the form of their quaternary salts), or tantomeric forms thereof, are manufactured by reacting a compound of the formula PqX (wherein X represents a halogen atom or a group -SR, R being a hydrocarbon radical, obtainable by the process of Specification 634,471) with a compound of the formula NH2A, or a salt thereof, or a substance which will give rise thereto under the reaction conditions (e.g. an acyl derivative thereof). The reaction may be effected by heating the reactants together, advantageously in a liquid medium and in the presence of an acid. In examples: (1) 2 - chloro - 4 - methyl - 6 - aminopyrimidine 3-methiodide is boiled with 4 : 6-diaminoquinaldine methochloride in dilute hydrochloric acid to produce 4-amino-6-(61-amino - 41 - methylpyrimidyl - 21 - amino) - quinaldine 1 : 31-dimethiodide; (2) 4-chloro-2-amino-6-methylpyrimidine 1-methiodide is boiled in water with 4 : 6-diaminoquinaldine methochloride hydrochloride, yielding 4-amino-6-(21-amino-61-methylpyrimidyl-41-amino) p  -quinaldine 1 : 11-dimethiodide, or the tantomeric 4-amino-6-(21-imino-11 : 61-dimethyl-11 : 21-dihydropyrimidyl-41-amino)-quinaldine 1-methiodide hydriodide or 4-imino-1-methyl-6-(21-amino-61-methylpyrimidyl -41-amino)-1 : 4-dihydroquinaldine 11-methiodide hydriodide or 4-imino-1-methyl-6-(21-imino-11 : 61-dimethyldihydropyrimidyl-41-amino)-1 : 4-dihydroquinaldine dihydriodide; the product may be converted into the dimethochloride by treating an aqueous solution thereof with hydrochloric acid or sodium chloride, or into the dimethobromide by analogous treatment; (3) the pyrimidine reactant in (2) is replaced by 4-iodo-2-amino-6-methylpyrimidine 3-methiodide, producing the corresponding 1 : 31-dimethiodide, which may be converted with silver chloride into the dimethochloride and with sodium carbonate solution into 4-amino-6-(21-imino-31 : 61-dimethyl-2 : 3-dihydropyrimidyl-41-amino)-quinaldine 1-methiodide; (4) 4 : 6-diaminoquinaldine methochloride is heated with 2-amino-4-methylthio6-methylpyrimidine 1-methiodide to give the product of (2); (5) the quinaldine reactant in (3) is replaced by 4 : 6-diaminoquinaldine methiodide; (6) the pyrimidine reactant in (5) is replaced by 4-chloro-2 : 6-diaminopyrimidine 3-methiodide, and (7) by the corresponding 1-methiodide; (8) 4 : 6-diaminoquinoline methiodide is reacted as in (2); (9) the quinaldine reactant of (2) is replaced by 2 : 6-diaminolepidine methiodide; (10) 4-amino-6-acetylaminoquinaldine 1-metho-methylsulphate and 4-chloro-2-amino-6-methylpyrimidine 1-methomethylsulphate are reacted as in (1) and the product is treated with hydrochloric acid to give the dimethochloride of (2); (11) the pyrimidine reactant of (10) is replaced by the 1-methiodide; (12) 4 : 6-diaminoquinaldine and 4-chloro-2 : 6-diaminopyrimidine 3-methiodide are reacted as in (1) to produce 4-amino-6-(21 : 61-diaminopyrimidyl-41-amino)-quinaldine 31-methiodide hydriodide; (13) 4 : 6 - diaminoquinaldine ethiodide is reacted as in (2).  Specification 634,531 also is referred to.  4 : 6-Diaminoquinaldinium salts.-The methochloride hydrochloride is obtainable by treating 4-amino-6-acetylaminoquinaldine with dimethyl sulphate in nitrobenzene and refluxing the product with aqueous hydrochloric acid.  It may be converted into the methochloride by the action of sodium carbonate solution and into the methiodide by the action of a solution of sodium carbonate and excess of potassium iodide.  The ethiodide is obtainable by treating 4-amino-6-acetylaminoquinaldine with diethyl sulphate in nitrobenzene, treating the product with sodium iodide solution, hydrolysing with hydrochloric acid and adding sodium carbonate and sodium iodide.  4 : 6-Diaminoquinoline methiodide is obtainable from ethyl 6-acetylamino-4-hydroxyquinoline-2-carboxylate by saponification, decarboxylation, treatment with phosphorous oxychloride and then with ammonia in the presence of phenol, quaternation of the resulting 4-amino-6-acetylaminoquinoline by means of dimethyl sulphate in nitrobenzene, hydrolysis with hydrochloric acid and treatment with sodium carbonate and sodium iodide.  2 : 6-Diaminolepidine methiodide is obtainable from 2-chloro-6-nitrolepidine by treatment with ammonia in the presence of phenol and acetamide, quaternation with dimethyl sulphate in nitrobenzene, treatment with excess of sodium chloride, reduction of the nitro group with iron and methanolic hydrochloric acid and treatment with sodium carbonate and sodium iodide.