SUBSTITUTED 3,6 BIS-(AMINOALKOXY)ACRIDINES, AND A PROCESS FOR THEIR PREPARATION

Abstract: Compounds selected from the group consisting of those of the formula: wherein n is the integer 1, 2 or 3; R₁ and R₂ are each hy­ drogen or methyl; R₃ and R₄ are the same or different and are hydrogen or straight chain or branched alkyl (C₁-C₄); and R₃ and R₄ taken together with the associated N(itro­ gen) is pyrrolidino, piperidino, morpholino or N-methyl-­ piperazino; and R₅, R₆ and R₇ may be the same or different and are selected from the group consisting of hydrogen, fluoro, chloro, bromo and nitro; with the proviso that when n is one or two and R₁ and R₂ are hydrogen or methyl and R₃ and R₄ are lower alkyl then at least one of R₅, R₆ and R₇ must be a substituent other than hydrogen; the phar­ macologically acceptable metal complexes thereof and the pharmacologically acceptable acid-addition salts thereof. A process for their preparation and compositions of matter useful for inducing the regression of tumors in warm-blooded animals and for enhancing the immune sys­ tem, and the method of treatment of tumors and enhancing the immune response in mammals therewith, the active in­ gredients of said compositions of matter being certain 3,6-bis(aminoalkoxy)acridines or the pharmacologically acceptable acidaddition salts thereof.

Description: TITLE: SUBSTITUTED 3 ,6-BIS (AMINOALOXY) ACRIDINES Brief Summary of the Invention This invention is concerned with new compounds of EMI1.1 wherein n is the integer 1, 2 or 3; R1 and R2 are each hydrogen or methyl; R3 and R4 are the same or different and are hydrogen or straight chain or branched alkyl (C1-C4); and R3 and R4 taken together with the associated N(itrogen) is pyrrolidino, piperidino, morpholino or N-methylpiperazino; and R5, R6 and R7 may be the same or different and are selected from the group consisting of hydrogen, fluoro, chloro, bromo and nitro; with the proviso that when n is one or two and R1 and R2 are hydrogen or methyl and R3 and R4 are lower alkyl then at least one of R5, R6 and R7 must be a substituent other than hydrogen. These novel substituted acridines form acid-addition salts with a variety of pharmaceutically acceptable organic and inorganic salt-forming reagents. These acid -addition salts, formed by admixture of the free base form of one of the acridines of the invention with one, two or three equivalents of an acid, suitably in a neutral solvent, are formed with such ides as sulfuric, phosphoric, hydrochloric, hydrobromic, nitric, citric, lactic, tartaric, actic and related acids. For purposes of the present invention, the substituted 3,6-bis(aminoalkoxy)acridine free bases are equivalent to their non-toxic acid-addition salts. These substituted 3, 6-bis (aminoalkoxy) acricines may be readily prepared by treating one mole of the substituted 3, 6-acridinediol disodium salt with two moles of an alkyl halide of the formula: EMI2.1 wherein x is chloro or bromo and R1, R2, R3 and R4 are as hereinabove defined. This reaction is preferably carried out in an inert solvent such as dimethylformamide at 75 -1000C., for a period of one hour or more. The product may be isolated by removing the inert solvent from the reaction mixture by evaporation, taking up the residue in water and extracting the aqueous phase with diethyl ether. Evaporation of the ether provides the product which may then be purified by advance chromatography. Alternatively, the compounds may be prepared by reacting-3,6-acridimediol with 1,2- or 1,3-dihaloalkanes or l-halo-2, or 3-hydroxysulfonyl alkanes in a solvent such as dimethylformamide for 15 minutes to 2 hours. The resulting bis (haloalkoxy) acridine can then be reacted with various mines of ammonia, preferably in a sealed bomb at 80-15O0C., for 10-50 hours. The product so isolated is purified as described above. The 3,6-acridinediol disodium salts may be prepared as described in the literature by treating substituted 3,6 -acridinediol with sodium hydride at room temperature in an inert solvent such as dimethylformamide for 15-30 minutes. These acridine compounds also form complexes with metal atoms such as ferric chloride, zinc chloride, cuprous chloride, potassium hexachloroplatinate, chromic chloride and the like which are considered a part of this invention. This invention is also concerned with the use of the compounds of formula (II) antitumor agents and enhansors of the immune response: EMI3.1 In the compounds of formula (II), n is an integer 1, 2 or 3; RI and R2 are each hydrogen or.methyl; R3 and R4 are the same or different and are hydrogen or straight chain or branched alkyl (C1-C4); and R3 and R4 taken together with the associated N(itrogen) is pyrrolidino, piperidino, morpholino or N-methylpiperazino; and R5, R6 and R7 may be the same or different and are selected from the group consisting of hydrogen, fluoro, chloro, bromo and nitro; as well as the pharmaceutically acceptable salts thereof. In recent years, the concept of surgical-adjuvant chemotherapy for the treatment of solid neoplasms has become widely accepted by clinical oncologists. Surgery is an effective treatment modality for the removal of the bulk of a large primary tumor, but often is not applicable to the removal of small, widely scattered metastatic foci of disease. It is recognized that the principal cause of death of cancer patients is the growth of unresolved metastatic tumor foci. Systemic chemotherapy, as an adjunct to surgery, is ideally suited to the elimination of tumor metastases, and has been responsible for much of the progress made in the treatment of human solid tumors. There are a variety of experimental animal tumor models that are used to assess the therapeutic effects of drugs on primary and metastatic tumor growth. The Lewis lung carcinoma is a highly malignant anaplastic murine carcinoma which when implanted subcutaneously gives rise to a large primary tumor that metastasizes to the lungs in the early stages of tumor growth. Surgical removal of the primary tumor is not curative unless performed within six days of tumor implantation, thereby preventing metastatic spread of tumor to the lungs. The actual cause of death of the experimental animals, even in the continued presence of the primary tumor, is the growth of the metastatic lung tumors. In this model system, therapeutic drug activity would be indicated by the inhibition of growth of the primary tumor (thereby preventing metastasis formation), or in conjunction with non-curative surgical removal of the primary tumor, by inhibiting the growth of lung metastases. This would be indicated by an increase in median survival time and an increase in the numbe.r of long term survivors (i.e. sure8") among drug treated mice when compared to mice that had received non-curative surgery and placebo instead of drug. Alternatively, the Lewis lung carcinoma can be implanted intraveneously in mice to establish "artificial" metastases in the lungs. Therapeutic drug activity, in this instance, would be reflected by an inhibition of the growth of these lung tumor metastases. The B16 melanoma implanted subcutaneously in mice gives rise to a large primary tumor which metastasizes to many distant sites. Surgery is curative when carried out early during the growth of the primary tumor, before metastatic spread of the tumor has occured. Systemic chemotherapy in conjunction with non-curative surgery, has been demonstrated to prevent metastatic tumor spread or to inhibit the growth of metastases formed prior to surgical removal of the primary tumor. Effective chemotherapy, in the latter instance, is indicated by an increased median survival time or an increased number of long term survivors (i.e. "cures") among drug treated mice when compared to placebo treated mice. The active compound of the present invention is active when tested according to the following procedures: (A) Antitumor Activity of Acridines Against Intravenously Inoculated Lewis Lung Carcinoma in Mice Lewis lung carcinoma cells, 5x105 viable cells, are injected intravenously into BDF1 mice. The drug was prepared in normal saline and administered once daily, by the oral route, at doses ranging from 38 mg/kg to 400 mg/kg on days 1, 7, and 13 following tumor cell inoculation. A control group of mice received a saline placebo, instead of drug, by the oral route on the same days of treatment. All mice were sacrificed on day 19 following tumor inoculation, their lungs removed and individually weighed. Additionally, a group of 10 normal, non-tumor bearing BDF1 mice, of the same sex, age, and body weight as the tumor bearing mice, were sacrificed and their lungs removed and weighed to determine the average normal lung weight. The average normal lung weight was subtracted from the weight of lungs from the tumored mice to determine the weight of tumorous tissue present in the lungs of the tumor bearing mice. A positive drug effect is indicated by a L58% reduction in the average lung tumor weight of the drug treated mice, relative to the average lung tumor weight of the saline placebo treated mice. The results of this test appear in Table I below. Reference to this animal model test system is: 1) "Growth Characteristics and Chemotherapeutic Response of Intravenously Implanted Lewis Lung Carcinoma". Ovejera et al., Cancer Chemotherapy Reports Part 2, vol 5:111-125, 1975. TABLE I Antitumor Activity of Acridines Against Intravenously Implanted Lewis Lung carcinoma in Mice1 Drug Dose Average2 Average No. Treatment (MG/RG Route Lung % Tumor Survivors/ Tumor Inhibition No. Weight Treated (mg) Day +19 Day +19- Day +19 Saline Oral 147 Control 19/20 3,6-bis(2- 400 Oral 12 92* 10/12 -diethyl- 300 n 40 73* 12/12 aminoethoxy) acridine tri- 150 n 72 51 12/12 hydrochloride 75 N 139 5 12/12 38 " 99 33 10/12 1. BDF1 male mice inoculated intravenously with 5x105 Lewis lung tumor cells on day zero: 3, 6-bis (2-diethylamino- ethoxy)acridine trihydrochloride administered on days 1,7, and 13 after tumor inoculation. 2. Average lung tumor weight = average weight of lungs from tumor bearing mice, minus average weight of lungs from normal, non-tumor bearing mice. * Denotes significant (-58%) inhibition of lung tumor weight. (B) Surical-Adjuvant Antitumor Activity Acridines Against LeWlS Lung Carcinoma Implanted Sub cutaneously In Nice BDF1 mice were inoculated subcutaneously in the right hind footpad with 5x105 viable Lewis lung carcinoma cells, on day zero. 3,6-bis(2-diethylaminoethoxy)acridine trihydrochloride was prepared in normal saline and administered by the oral route once daily, on days 1, 7, and 13 following tumor inoculation, at doses ranging from 50 mg/kg to 400 mg/kg. A control group of mice received a saline placebo instead of drug, and another group of tumor bearing mice received the positive control drug cyclophosphamide, at 100 mg/kg, administered by intraperitoneal injection. On the 11th day after tumor implantation r the mice were an- esthesized with Nembutal, and the tumor bearing feet surgically amputated above the ankle joint. The surgical incision was swabed with alcohol and sealed with stainless steel wound clips. The tumor bearing feet were individually weighed and the average weight of a normal foot (determined by weighing amputated feet from non-tumor bearing mice of the same age, sex, and body weight) was subtracted to obtain the weight of tumor tissue in the amputated foot. Mice were then observed for deaths until the 90th day after tumor implantation. A therapeutic drug effect is indicated by; (a) a significant t-58%) inhibition of growth in the primary footpad tumor, (b) a significant (-25%) increase in life-span of drug treated mice, or (c) a statistically significant (p < 0.05) increase in the number of survivors at 90 days; i.e. "cures", relative to the placebo treated control group of mice. The results of this test appear in Table II below. References to this animal model test system are: 1) "Success and Failure in the Treatment of Solid Tumors. Cure of Metaststic Lewis Lung Carcinoma with Methyl-CCNU (NSC-95441) and Surgery-Chemo therapy". Mayo et al., Cancer Chemotherapy Reports 56:183-195, 1972. 2) "Effectiveness of Clinically Active Antineo plastic Drugs in a Surgical-Adjuvant Chemotherapy Treatment Regimen Using the Lewis Lung (LL)Carci noma". Merker et al., International Journal of Cancer 21:482-489, 1978. TABLE II Surgical-Adjuvant Antitumor Activity Aoridines Against Lewis Lung Carcinoma Implanted Subcutaneoualy in Footpads of BDF1 Micel Drug Dose Average2 Average Median Sur- @ Increased No. Survivors (MG/KG) Tumor Weight @ of Tumor vival Time Life-Span No. Treated In MGS Weight (Daya) (at +90 days) (Day + 11) Inhibition (Day + 11) Saline ----- 379 Control 30.0 ---- 5/24 3,6-bis (2- 400 17 96* > 90.0 > 200+ 10/12 ## -diethylaminoethoxy)- 300 56 85* > 90.0 > 200+ 10/12 ## acridine tri- 200 38 90* > 90.0 > 200+ 12/12 ## ride 100 203 46 > 90.0 > 200+ 9/12 ## 50 236 38 > 90.0 > 200+ 8/12 Cyclophos- 100 93 75* > 90.0 > 200+ 10/12 ## phamide 1. BDF@ male mice inoculated subcutaneously in footpad with 5x105 Lewis lung tumor cells on day zero; 3,6-bis (2-diethylaminoethoxy)acridine trihydrochloride administered orally, and Cyclophosphamide intraperitoneally, on days 1, 7, and 13 following tumor implantation. 2. Average tumor weight determined after surfical amputation of tumor bearing foot on day 11 following tumor implantation. # Denotes significant ( > -58%) inhibition of primary growth. ## Denotes significant (p < .05) increase in number of surviving mice, relative to saline control group. + Denotes significant ( > -25%) increase in life span of drug-treated mice, relative to saline control group. (C) Surgical-Adjuvant Antitumor Activity of Acridines Against B16 Melanoma Implanted Subcutaneously in Mice BDF1 mice were inoculated subcutaneously in the right hind footpad with 5x105 viable B16 melanoma cells, on day zero. The drug was prepared in normal saline and administered by the oral route once daily, on days 1, 7, and 13 following tumor implantation, at doses ranging from 50 mg/kg to 400 mg/kg. A control group of mice received a saline placebo instead of drug, and another group of tumor bearing mice received the positive control drug cyclophosphamide, at 100 mg/kg, by intraperitoneal injection. On the 21st day after tumor implantation, the mice were anesthesized with Nembutal, and the tumor bearing feet were surgically amputated above the ankle joint. The surgical incision was swabed with alcohol and sealed with stainless steel wound clips. The tumor bearing feet were individually weighed and the average weight of a normal foot (determined by weighing amputated feet from non-tumor bearing mice of the same sex, age, and body weight) was subtracted to obtain the weight of tumor tissue in the amputated feet. Mice were then observed for deaths until the 90th day after tumor implantation. A therapeutic drug effect is indicated by: (a) a significant (-58%) inhibition of growth in the primary footpad tumor, (b) a significant (-25%) increase in the life-span of drug treated mice, or (c) a significant (p < 0.05) increase in the number of survivors at +90 days, i.e. "cures", relative to the placebo treated control group of mice. The results of this test appear in Table III below. Reference to this animal model test system is: 1) "The Potential for Murine Tumor Models in Surgical Adjuvant Chemotherapy." Griswold, D.P. Jr., Cancer Chemotherapy Reports Part 2 vol. 5:187-204, 1975. TABLE III Surgical-Adjuvant Antitumor Activity of Acridines Against B16 Melanoma Implanted Suboutaneously in Footpads of BDF@ Mice@ Drug Dose Average@ Average Median Sur- % Increased No. Survivors (MG/KG) Tumor Weight % of Tumor vival Time Life-Span No. Treated In MGS Weight (Days) (at +90 days) (Day + 11) Inhibition (Day + 11) Saline ----- 603 Control 53.0 ---- 0/24 3,6-bis(2- 400 51 92# 69.0 30+ 5/12 ## -diethylaminoethoxy)- 300 63 90# > 90.0 > 70+ 8/12 ## acridine tri- 200 122 80# > 90.0 > 70+ 7/12 ## hydrochlo100 225 63# 64.0 21 + 2/12 ## ride 50 403 33 54.0 2 + 0/12 Cyclophos- 100 202 67# > 90.0 > 70 + 7/12 ## phamide 1. BDF@ male mice inoculated with 5x105 B16 melanoma cells subcutaneously in footpad on day zero; 3,6-bis (2-diethylaminoethoxy) acridine trihydrochloride administered orally, and Cyclophosphamide intraperitoneally, on days 1, 7, and 13 following tumor implantation. 2. Average tumor weight determined after surgical amputation of tumor bearing foot on day 1 following tumor implantation. # Denotes significant ( > -58%) inhibition of tumor growth. ## Denotes significant (#.05) increase in number of surviving mice, relative to saline control group. + Denotes significant (#-25%) increase in life span of drug-treated mice, relative to saline control group. TABLE IV Effect of Acridines on Distribution of Metastatic Foci in Lungs of Mice Inoculated Subcutaneously with B16 Melanoma Dose Drug (mg/kg) No. of mice with lung metastases No. of lung foci/mouse 0 1-5 6-10 11-15 > 15 0 0 4 3 1 2 Saline 0 3 3 1 0 3,6 -bis(2-dimethyl- 200 All mice dead aminoethoxy)acri- 100 3 7 0 0 0 0 dine trihydrochlo- 50 1 1 4 4 0 0 ride 25 2 4 2 2 1 0 12.5 1 5 1 1 1 6.5 0 3 3 1 1 5-fluorouracil 50 2 4 3 0 0 40 2 5 4 0 0 30 3 3 3 0 0 25 3 3 1 1 1 20 1 2 1 2 1 BDF1 male mice inoculated subcutaneously with 0.25 ml of a 10% tumor homogenate on day 0. Drugs administered intraperitoneally days 1, 5, 9 and 13; mice sacrificed on day 25, 10 mice per group. Distribution of metastatic foci from test results shown in Table 3. (D) Potentiation of Cyclophosphamide Activity Against B-16 Melanoma in Mice BDF1 male mice are inoculated subcutaneously with 0.25 ml. of a 10% B-16 melanoma homogenate. Cyclophosphamide is administered intraperitoneally at 80 mg./kg. the second day following the day of tumor implantation. Test compounds are given intraperitoneally on days +6, +8 and +10 relative to tumor implantation. Tumors are measured on day +26 with a positive response being indicated by a -508 inhibition of tumor size compared to the Cytoxan control. The compound 3, 6-bis (2-diethylaminoethoxy) acridine trihydrochloride in combination with Cytoxan produced at 50% inhi bition in local tumor growth, whereas monotherapy with either drug alone failed to do so. The results of this test appear in Table 5. TABLE V Effect of Acridines in Combination with Cytoxan Against B16 Melanoma in Mice Cycle- 3,6-bis(2- Average tumor weigth (mg) NSP5 IIS5 phosph- diethyl- Days after tumor inoculation (days) (%) amide aminoetho (mg/kg) xy)acridine trihydroch chloride ((tx;/kg) 21 26 0 0 3577 (7/10)1 9989 (3/8) 22.5 80 0 12372 (8/8) 7458 (3/8) 25.0 11 0 100 18922 (7/8) 41272 (7/8) 27.5 22 0 50 21682 (7/8) 31112 (4/8) 26.5 18 25 2625 (7/8) 63032 (5/8) 28.5 2 80 100 1532 (8/8) 28363 (5/8) 27.5 22 50 2041 (8/8) 42583 (7/8) 28.5 27 25 2029 (8/8) 31253,4 (6/8) 29.5 31 BDF1 male mice inoculated subcutaneously with 0.25 ml. of a 10@ tumor homogenate on day 0. Drugs were administered intraperitoneally: cryclochosphoamide on day 2. 3. 6-bis (2- -diethylaminoethoxyzacridine trihydrochloride on days 6, 8 and 10. 1Number of survivors over mmber of mice treated, 2 Significant at the p > 0,05 level when compared to untreated controls. 3Significant at the p > 0.05 level when compared to treatment with cyclophosphamide alone. 4Significmt at the p < 0.05 level when compared to treatment with either drug alone. 5MST = Median Survival Time ILS = Percent increase in life span over control The use of immunomodulants and chemotherapeutic adjuvants constitutes a new therapeutic approach to the treatment of immune deficiencies and cancer and is based on the concept that there are distinctive antigens in or on most tumor cells, such as viral particles and bacteria, that distinguish them from normal host cells, or a particular component of the immune system that can be retulated. A majority of tumor immunologists favor the view that potentially malignant cells constantly arise but because of their "foreigness" they are normally eliminated by a competent humoral and cellular immune system. Occasionally, however, tumor cells escape this immune surveillance and continue to reproduce and cancer results. The reason for the failure of the normally efficient immune surveillance mechanisms are not fully understood but it is thought that the immune system becomes less effective with increasing age. It is depressed in certain genetic immuno-deficiency diseases, in various bacterial, fungal or viral infections, and in patients undergoing immuno-suppressive therapy. The growth of the neoplasm itself, as well as the various therapeutic modalities designed to treat the disease, e.g., cytotoxic chemotherapy and viraliation, leads to a still greater depression of host resistance and results in an increased susceptibility to both exogenous and indogenous infections and perhaps accounts for the re-initiation of tumor growth and metastasis which frequently follows treatment-induced tumor remission. If depression of the immune system facilitates the growth of malignancies, regulation of any particular facet of immune responses may help the host to overcome residual cancer cells. Therefore, it is considered desirable to search for chemical agents (i.e., immunoregulants) capable of restoring and stimulating the host's own immune defense mechanisms in order to overcome the deficiencies which account for the increased susceptibility to disease and failure to eradicate the cancer. It is acknowledged that such immunoregulating agents would very likely be incapable of arresting the growth of a large rapidly proliferating tumor but that their clinical utility would derive from their capacity to enhance normal immune surveillance mecahnisms in pateints whose tumor burden has largely been reduced by conventional surgical, radiotherapeutic or chemotherapeutic methods. It would be hoped that the few producing a higher incidence of long term survivors or complete cures. Experimental studies in animals have demonstrated the anti tumor potential of a number of immunoregulants including live organisms of bacillus Calmett-Guerin (BCG), heat-killed cells of Corynebacterium parvum, polynucleotides, and the anthelmintic drug, levamisole. These substances have been shown to stimulate cellular immunity and to produce tumor regressions. Some successes have been claimed in early clinical trials with BCG against malignant melanoma and acute leukemia and with levamisole against lung cancer and breast cancer. Although the antitumor effects produced by these agents have been promising, significant therapeutic benefits have yet to be realized. Since this is a very new therapeutic approach, new drugs and methods of treatment must receive careful clinical evaluation in order to reveal the full potential of these drugs. Modern research is directed to the discovery of a drug similar to, but more potent than, the known immunoregulants such as levamisole that would be effective in the eradication of tumor cells when used in conjunction with standard therapeutic measures. Stimulators of host resistance may be detected in animal models that can, in fact, detect both immunostimulators and anticancer agents. Mice are put in a condition simulating immunodepression common to cancer patients. This is accomplished by infecting mice either with a leukemia virus which produces both leukemia and a disease-related immunodepression or with a transplantable mammary tumor. Effective drugs are recognized by their ability to restore or enhance the antibody response in the experimental mice. The active compounds and novel compositions of the the present invention are active as immunomodulators when tested according to the following procedures: (E) Rauscher leukemia virus Rauscher leukemia virus is inoculated intraperitoneally into BALB/C mice. The virus inoculum is a 20%(W/V) spleen extract made from 21-day infected spleens of BALB/C mice. All mice are within a three gram weight range, with a nimimum weight of 18 g., and all mice are of the same sex, usually male. Sheep red blood cells are injected intraperitoneally on the seventh day. There are 5 mice per test group. The test compound is administered orally on the sixth day as 0.5 ml. (in 0.2% Noble agar in saline) at a dose of 37.5 to 600 mg/kg of body weight, and again on the seventh and eighth day, in the same manner. On the fourteenth day the mice are weighed and bled from the retroorbital sinus. The blood is pooled and the harvested serum is stored at 40C., for 24 hours. Hemagglutinin tests are performed by standard procedures using the microtiter plate technique. Acceptable hemagglutinin titer for leukemic (immunosuppressed) mice is =1:128. Positive control compounds are Poly I:C (polyinosinic acid:-polycytidylic acid) administered intraperitoneally on days +6, +7 and +8. Acceptable positive control hemagglutinin titers are 4-fold higher than the titers obtained in leukemic control mice. The results of this test on typical compounds of this invention appear in Tables 6 and 7. TABLE VI Rauscher Leukemia Virus % Reduction in Spleen Size DRUG % Reduction (mg/kg) 3,6-Bis(2-diethylaminoethoxy)acridine - 71(100) 68(50) trihydrochloride 3, 6-Bis (2-ethylaminoethoxy) acridine 89(100) trihydrochloride 4,5-dichloro-3, 6-bis (2-diethylamino- 86 (50) ethoxy)acridine 3,6-biw(2-diethylaminoethoxy)dinitro- 108(100) acridine 3,6-bis(2-isopropylaminoethoxy)acri- 96(200) dine trihydrochloride 3,6-bis(3-piperidinopropoxy)acridine 74(50) trihydrochloride 3,6-bis(2-piperidinoethoxy)acridine 84(100) trihydrochloride TABLE VII Antibody Restoration in Mice with Rauscher Virus-Induced Leukemia DRUG DOSE mg/kg ROUTE SERIM HEMAGGLUTININ TITER/SALINE CONTROL TITER Poly I: :C 10 IP 1024/32 Uninfected Controls - 2048 3,6-Bis(2-diethylaminoethoxy) acridine. 3HCl 100 IP 512/32 4,5-dichloro-3,6bis(2-diethylaminoethoxy) acridine 100 ORAL 128/16 3,6-bis(2-isopropylaminoethoxy)acridine. 3HCl 100 ORAL 512/32 3,6-bis(3-piperidinopropoxy)acridine. 3HCl 50 ORAL 1024/32 3,6-bis(2-piperidinoethoxy)acridine. 3HCl 100 ORAL 256/16 (F) Interferon Induction Taconic Farms male white mice, weighing 18-24 grams, are treated by gavage 18 hours before infection with the test compound suspended or dissolved. in 1.0 ml. of 0.2% aqueous agar solution. The mice are then infected by subcutaneous injection with one LD95 of Columbia SK virus in a 0.2 ml. volume of distilled water. Groups of infected, untreated mice are used as controls to show the lethality of the infection. The test duration is seven days. Serum from surviving animals is collected and used to assay for interferon. The requisite number of monolayers of L-929 mouse cells in 60 x 15 mm. tissue culture dishes is prepared. The growth medium is minimum essential medium plus 10% fetal calf serum. Two fold dilutions of the serum starting at 1:10 are made. using minimum essential medium plus 2% fetal calf serum as a maintenance medium diluent. A 5 ml. portion of each dilution is added to each of three monolayer sutures and they are incubated at 37C. overnight. The monolayers are washed twice with warmed minimum essential medium and. then challenged with approximately 60 plaqueforming units/dish of vesicular stomatitis virus in 0.5 ml. of minimum essential medium. The virus is adsorbed for 60 minutes at 370C., tilting the dish every 15 minutes to spread the virus and to prevent the monolayers from drying. Following adsorption, each dish is overlayed with 8 ml. of agar medium composed of one part 4% Noble agar containing 0.8 ml./kl. diethylaminoethyl dextran to seven parts minimum essential medium plus 2% fetal calf serum. The agar is allowed to harden and is then incubated at 37 CC. The plaque development is observed and stained with 0.1% crystal violet in 20% ethanol at the appropriate time (2-4 days). The number of plaques/dish are counted, the average is calculated and the results are plotted on a curve versus dilution. A compound is considered active at a given dilution if it inhibits 50% or more of the plaque formation, the inhibition being due to the presence of interferon. The results of this test on typical compounds of this invention appear in Table 8. Protection of mice against lethal virus infection by oral pre-trea-tment with 3,6-bis(2-diethylaminoethoxy)- acridine trihydrochloride - Groups of 20 random-bred Swiss male mice were administered a single oral dose of 3,6-bis (2-diethylaminoethoxy)acridine trihydrocyloride at 400 mg/kg, tilorone hydrochloride at 200 mg/kg, or a saline placebo. At 24, 48, 72 and 96 hours after drug treatment, separate groups of mice were injected SC with an LD95 dose of the interferon sensitive virus, Columbia SK. Mice were observed for a period of 14 days post-virus infection to determine if drug pre-treatment produced a significant increase in survival relative to the survival of placebo-treated control mice. Typically, protection from lethal infection with Columbia SK virus is associated with induction of interferon. The results appear in Table 9. TABLE VIII Induction of Circulating Interferon in BDF@ Mice Following Oral Administration of Acridine Hours after 3,6-Bis(2 -diethylaminoethoxy)- Serum interferon acridine trihydrochloride titer2 (units/ml) 0 10 8 100 16 3200 24 3200 32. 2100 48 50 72 10 1BDF male mice received a single oral dose of 3,6-Bis(2diethylaminoethoxy)acridine trihydrochloride at 300 mg/kg at zero time. 2Reciprocal of serum dilution producing a 50% reduction in cytopathic effects of vesicular stomatitis virus in murine L-929 cells. TABLE IX Antiviral Effect of Drugs Against an Interferon Sensitive Virus, Columbia SK DRUG DOSE Survivors/Total mg/kg (route) 14 Days Post Injection 3,6-Bis (2-diethyl- 8 (gavage) 10/15 aminoethoxy)acridine. 3HCl 3,6-Bis (2-ethyl- 400 (Oral) 10/15 aminoethoxy)acridine. 3HCl 4,5-dichloro-3,6- 400 (Oral) 7/15 -bis (2-diethylaminoethoxy)acridine 3,6-Bis (2-isopro- 400 (Oral) 15/15 pylaminoethoxy)acridine. 3HCl 3,6-Bis(3-piperi- 400 (Oral) 12/15 dinopropoxy)acridine. 3HCl 3,6-Bis(2-piperi- 400 (Oral) 12/15 dinoethoxy) acridine. 3HCl 3,6-Bis (2-diethyl- 400 (Oral) 13/15 aminopropoxy)acridine. 3HCl Poly I:C 6/45 (G) Stimu1-at-ion of NK-cell Activity in Normal Mice The existence of natural killer lyphocytes (NK cells) has recently been described in mice, rats and humans. NK cells derived from normal animals and humans mediate the rapid destruction of a wide variety of syngeneic and allogeneis tumor cells and virus infected cells, when tested in vitro. No prior exposure of the animal to tumor cells or viruses is required for NK cell-mediated target cell destruction. The resistance to growth of transplanted tumors in mice has been correlated with high levels of NK cell activity. The rapid rise in the level of NK cell activity in animals following infection with a variety of viruses, bacteria, or transplanted tumor cells suggests a possible role of NK cells in immune surveillance. It has recently. been reported that administration of interferon induces or interferon causes a rapid and substantial rise in the level of NK cell activity in mice. The results appear in Table 10. References to this stimulation of NK cell activity are: 1) J.Y. Djeu, J.A. Beinbaugh, H.T. Holden and R. B. Herberman, J. Immunology, 122, 174 (1979). 2) S. Einhorn, H. Glomgren and H. Grander, Int. J. Cancer, 22, 405-412 (1978). 3) Authors unknown, Nature, 273, 759, (1978). 4) Authors unknown, Nature, 277, 221, (1979). Test Procedure Groups of 5-10 mice are administered test compounds or a placebo by oral, intraperitoneal, intravenous or subcutaneous routes. Approximately 18 hours later the mice are sacrificed and the spleens from each group of mice removed and pooled by groups. The pooled spleens are placed in 40C. serum-free Eagle's minimum essential medium (MEM) and disrupted by gentle homogenation. The resulting single cell suspension is filtered through a 60 mesh nylon screen to remove debris and the cells are collected by centrifugation. The cell pellet is resuspended in 10 ml. of hypotonic phosphate buffered saline (0.0 M sodium chloride + 0.001M potassium phosphate buffer, pH 7.0) for 5-10 seconds to lyse erythrocytes. A 40 ml. portion of MEM supplemented with 10% fetal calf serum (MCM + F) is added and the cell suspension is filtered to remove aggregated debris. Spleen cells are collected by centrifugation, resuspended in MEM + 7 F and the cell density adjusted to 1-2x107 spleen cells per ml. of medium. Human or murine tumor cells are used as targets of NK cells mediated cytolysis. Target cells are incubated in 0.5 ml. of MEM + F containing 50-100u Ci of 51chromium (as sodium 51chromate). After incubation at 370C for 1-3 hours, target cells are washed with three 40 ml. volumes of cold MEM + F, to remove intracellular 51chromium. 51chromium -labelled target cells are resuspended in MEM + F at a cell density of 0,5-1 x 105 per ml. of medium. Triplicate assays of each cell suspension, derived from pooled spleens of test compound or placebo treated mice, are prepared to assess NK-cell activity. Spleen.cells (5 x 106) and 51chromium-labelled target cells (1 x 105) are placed in plastic 10 x 75 mm. Falcon tubes containing 1.0 ml. of MEM + F. The tubes are incubated at 370C. for 4 hours, then chilled to 40C. and centrifuged. Aliquots of cell-free supernatant medium are removed from each assay tube and the quantity of 51chromium released from lysed target cells is determined. A statistically significant increase in the quantity of 51chromium released in assays of spleen cells derived from drug treated mice, as compared to assays of spleen cells from placebo treated mice, indicates drug stimulation of NK cell activity. The compound 3,6 -bis(2-diethylaminoethoxy)acridine trihydrochloride is active in this test. The novel compounds of this invention do posess antitumor activity in their own right, and are chemotherapeutic adjuvants. In additiop,they potentiate the effect of anti-tumor agents and act as adjuvants to surgical therapy. TABLE X Increased Levels of Natural Killer Lymphocvtes In Normal Mice Following Oral Administration of Acridines DRUG DOSE %Specific51 Cr Release* (mg/kg) BDF1Nice CD-1 Mice Saline - 19.0 11.5 3,6-Bis(2-dieth- 300 29.5 ylaminoethoxy) acridine. 3HCl 150 37.9 100 - 41.2 50 - 30.2 25 - 32.5 12.5 - 26.5 Poly IC (IP) 10 35.0 14.2 51C, * $of total Cr released by lysed tumor target cells co-cultured with splenic NK-cells. (H) Lack of Effect on Normal Mouse Bone Marrow The effect of drugs on normal mouse bone marrow is evaluated by determining total cell counts of femurs and by the ability of surviving cells to form colonies in semi-solid medium. The test compound is administered orally and the reference drug Cytoxan is administered intraperitoneally to C57BL6 male mice. One femur from each of three mice per dose level is assayed 24 hours after treatment. Counts of nucleated cells are performed on pooled marrow suspensions and the clonogenic assay is performed by plating 50,000 cells in one ml. of culture medium in each of four culture dishes. The medium to support bone marrow progenitor cell growth is McCoy's medium supplemented with 0.9% methocel, 1.8% human serum albumin, 10% bovine fetal serum and 10% "conditioned" L-cell medium. Cultures are incubated at 370C. in a humidified atmosphere and baloneys are counted at seven days. The compound 2,6-bis(2-diethylami- noethoxy)acridine trihydrochloride had minimal effects on the total nucleated cell count while Cytoxan depressed the cell count significantly. The compounds of the present invention are effective as immunomodulators (that is, they modulate the immune response) when administered orally in amounts ranging from about 5 mg. to about 200 mg. per kilogram of body weight per day. A preferred dosage regimen for optimum results would be from about 5 mg. to about 50 mg. per kilogram of body weight per day, and such dosage units are employed that a total of from about 350 mg. to about 3.5 grams of the active compound for a subject of about 70 kg. of body weight are administered in a 24-hour period. This dosage regimen may be adjusted to provide the optimum therapeutic response. For example, several divided doses may be administered daily or the dose may be proportionally reduced as indicated by the exigencies of the therapeutic situation. A practical advantage of this invention is that the active compound may be administered in any convenient manner such as the oral or buccal routes or it may be incorporated directly in the diet. The compounds of the present invnetion may be orally administered, for example, with an inert diluent or with an assimilable edible carrier, or they may be enclosed in hard or soft shell gelatin capsules, or they may be compressed into tablets, or they may be incorporated directly with the food of the diet. For oral therapeutic administration, the active compounds may be incorporated with excipients and used in the form of tablets, troches, capsules, elixirs, suspensions, sy ups, wafers, and the like. Such compositions and preparations should contain at least 0.5% of active compound. The percentage of the compositions and preparations may, of course, be varied and may conveniently be between about 2% to about 60% of the weight of the unit. The amount of active ingredient in such therapeutically useful compositions is such that a suitable dosage will be obtained. Preferred compositions or preparations according to the present invention are prepared so that an oral dosage unit form contains between about 50 and 250 milligrams of active compound. The tablets, troches, pills, capsules and the like may also contain the following: a binder such as gum tragacanth, acacia, corn starch or gelatin; excipients such as dicalcium phosphate; a disintegrating agent such as corn starch, potato starch, alginic acid and the like; a lubricant such as magnesium stearate; and a sweetening agent such as sucrose, lactose or saccharin may be added or a flavoring agent such as peppermint, oil of wintergreen, or cherry flavoring. When the dosage unit form is a capsule, it may contain, in addition to materials of the above type, a liquid carrier such as a fatty oil. Various other materials may be present as coatings or to otherwise modify the physical form of the dosage unit. For instance, tablets, pills, or capsules may be coated with shellac, sugar or both. A syrup or elixir may contain the active compound, sucrose as a sweetening agent, methyl and propylparabens as preservatives, a dye and flavoring such as cherry or orange flavor. Of course, any material used in preparing any dosage unit form should be pharmaceutically pure and substantially non-toxic in the amounts employed. The e invention will be described in greater detail in conjunction with the following specific examples. Example 1 3, 6-bis (2-diethylaminoethoxy) -4,5 ,-dichloro-2-nitroacridine A 119.5 mg. portion of 3,6-bis(2-diethylaminoeth oxy)-4,5-dichloroacridine is dissolved in one ml. of concentrated sulfonic acid. The solution is cooled in an ice bath and 60 mg. of potassium nitrate are added. The mixture is stirred at 0 0C for one hour, then at room temperature for 20 hours, poured into 20 ml. of ice water and the pH adjusted to 11.5 with 5N sodium hydroxide. The mixture is then extracted three times with dichloromethane. The extracts are combined, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to a black gum. This gum is slurried in 25 ml. of boiling hexane and filtered. The filtrate is concentrated to 10 ml. and cooled in an ice bath. The crystals are collected and dried in vacuo, giving 54 mg. of the desired product, m.p. 100-1020C. Example 2 3 ,6-bis (2-diethylaminoethoxy) -4, 5-dinitroacridine A 5.37 g. portion of 3,6-bis(2-diethylaminoethoxy) acridine trihydrochloride monohydrate is dissolved in 20 ml. of concentrated sulfuric acid. The solution is cooled in an ice bath and 2.22 g. of potassium nitrate are added. The mixture is stirred at OOC for one hour, then at room temperature for 18 hours, poured into 300 ml. of ice water and the pH adjusted to 12 with 10N sodium hydroxide. The mixture is extracted three times with dichloromethane. The extracts are. combined, washed with water, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo, giving 4.3 g. of crude product. This material is purified by dry column chromatography on alumina using ethyl acetate as the developer. The compound is then recrystallized from methanol, giving 2.5 g. of the desired product, m.p. 138-140 cc. Example 3 3, 6-bis (2-diethylaminoethoxy) -4, 5-dichloroacridine A 2.148 g. portion of 3,6-bis(2-diethylaminoethoxy) acridine trihydrochloride monohydrate is dissolved in 8 ml. of concentrated sulfuric acid. This solution is cooled in an ice bath and 1.175 g. of N-chlorosuccinimide are added. The procedure of Example 3 is followed giving 1.5 g. of a reddish brown crude product. This product is dissolved in 100 ml. of dichloromethane and filtered through a 2 inch x 2 1/2 inch bed of alumina. The filter bed is washed with one liter of dichloromethane, then one liter of ethyl acetate. The filtrates are combined, concentrated in vacuo and the residue is crystallized from 10 ml. of hexane giving 1.067 g. of the desired product as yellow crystals, m.p. 83-840C. Example 4 3,6-bis(2-dethylaminoethoxy)-4,5-dibromoacridine The procedure of Example 3 is repeated, using 1.566 g. of N-bromosuccinimide in place of the N-chlorosuccinimide. The crude product is filtered through a 2 1/2 inch x 1 1/2 inch Magnesol plug using 2 liters of ethyl acetate. The filtrate is concentrated in vacuo and the residue crystallized from 10 ml. of heptane, giving 0.921 g. of the desired product as yellow crystals, m.p. 66-680C. Example 5 3, 6-bis (2-diethylaminoethoxy) -4, 5-dichloro-l (or), 7-di nitroacridine 3,6-bis(2-diethylaminoethoxy)-4,5-dichloroacridine is treated as described in Example 1, except that the mixture is heated at 800C. for 16 hours resulting in the desired product. Example 6 3,6-bis(2-diethylaminoethoxy)-4,5-dibromo-2(or 1)nitroacri dine 3,6-bis(2-diethyaminoethoxy)-4,5-dibromoacridine is treated as described in Example 2, giving the desired product. Example 7 3,6-bis(2-diethylaminoethoxy)-4,5-dibromo-l(or 2), 7-dini troacridine 3,6-bis(2-diethylaminoethoxy)-4,5-dibromoacridine is treated as described in Example 5 , giving the desired product. Example 8 3,6-bis(2-diethylaminoethoxy)-4,5-diacetamidoacridine 3,6-bis(2-dietmylaminoethoxy)-4,5-dinitroacridine is reduced with hydrogen and palladium catalyst in acetic anhydride as the solvent in the reduction, giving the desired product. Example 9 3,6-bis(2-diethylaminoethoxy)-2(or 1)-nitroacridine 3,6-bis(2-diethylaminoethoxy)-4,5-dibromo-2(or 1) -nitroacridine is reduced with tri-n-butyltin hydride to give the desired product. Example 10 3,6-bis(2-diethylaminoethoxy)-2 (or 1)-aminoacridine 3,6-bis(2-diethylaminoethoxy)-2(or l)nitroacridine is reduced as described in Example 8 except using ethanol as solvent, giving the desired product. Example 11 3,6-bis(2-diethylaminoethoxy)-4,5-dihydroxyacridine 3, 6-bis (2-diethylaminoethoxy) -4, 5-diaminoacridine is diazitized with concentrated nitric/sulfuric acid giving the bis-diazonium salt which is then hydrolized by stirring in 5% aqueous sulfuric acid for 3 hours, giving the desired product. Example 12 3,6-bis(2-diethylaminoethoxy)-4,5-difluoroacridine 3, 6-bis (2-diethylaminoethoxy) -4, 5-diaminoacridine is diazotized as described in Example 11. The bis-diazonium salt is then treated with potassium tetrafluoroborate. The tetrafluoroborate salt is thermally decomposed to give the desired product. Example 13 3, 6-his (-2-dimethylaminoethoxy) -l (or 2) ,7-dichloroacridine 3,6-bis(2-dimethylaminoethoxy)-l(or 2),7-diaminoacridine is diazotized with concentrated nitric/sulfonic acid. The bis-diazonium salt is treated with cuprous chloride giving the desired product. Example 14 3,6-bis(-chloroethoxy)acridine hydrochloride To a mixture of 2,36 g. of a 61.14% dispension of sodium hydride in oil and 5.20 g. of 3,6-acridimediol sulfate (2.1 is added) and 50 ml. of N,N-dimethylformamide. After stirring at room temperature for 40 minutes, 6.35 g. (4.57 ml.) of chloroethyl methanesulfonate are added to the reaction mixture. The mixture is then stirred at room temperature for 2 hours, then at 500C for 2.5 hours, poured into 250 ml. of ice-water and placed in a freezer overnight. The resulting yellow crystals are collected and dissolved in 100 ml. of chloroform. To this solution is added 6 ml. of 6N hydrochloric acid in isopropanol. Dilution of the chloroform solution with ether gives 2.8 g. of the desired product as yellow crystals, m.p. 228-2200C. Example 15 3, 6-bis' (?2-methvlaminoethoxy) acridine trihydrochloride A suspension of 1.5 g. of 3,6-bis(2-chloroethoxy) acridine hydrochloride in 100 ml. of methylamine is heated in a steel bomb at 800C. for 24 hours. The excess methylamine is removed under reduced pressure. The chloroform solution containing the orange residue is washed with two 30 ml. portions of saturated aqueous sodium bicarbonate, then dried over sodium sulfate and filtered. The chloroform is removed', the residue is dissolved in 50 ml. of ethanol and 10 ml. of 6N hydrochloric acid in isopropanol are added. This solution is heated to boiling, water is added until a clear solution is obtained and the solution is cooled, giving 1.25 g. of the desired product as orange crystals, m.p. 267-2690C. Example 16 3,6-bis(2-n-propylaminoethoxy)acridine trihydroxhlor The compound is prepared from 3,6-bis(2-chloro ethoxy)acridine hydrochloride and n-propylamine as described in Example 15, giving 1.20 g. of the desired product as yellow crystals, m.p. 250-2520C. Example 17 3,6-bis(2-ethylaminoethoxy)acridine bishydrochloride The compound is prepared from 3,6-bis(2-chloroeth- oxy-acridine hydrochloride and ethylamine as described in Example 15, giving 1.4 g. of the desired product as orange crystals, m.p. 253-2550C. Example 18 3,6-his C'2:-n'-butylaminoethoxy) acridine trihydrochloride The compound is prepared from 3,6-bis(2-chloroethoxy)acridine hydrochloride and n-butylamine as described in Example 15, giving 1.45 g. of the desired product as yellow crystals, m.p. 254-2560C. Example 19 3,6-bis[2-(2-hydroxyethylamino)ethoxy]acridine The compound is prepared from 3,6-bis(2-chloroethoxy.)acridine hydrochloride and ethanolamine as described in Example 15, giving 0.7 g. of the desired product as yellow crystals, m.p. 125-1270C. Example 20 3,6-bis[2-(2-hydroxyethylamino)ethoxy]acridine trihydrochlo ride The compound 3,6-bis[2- (2-hydroxyethylamino )ethoxy] acridine is converted to the trihydrochloride salt as described in Example 15, giving 0.2 g. of the desired product as orange cryatals, m.p. 256-2580C. Example 21 '3', 6-bis (2-aminoethoxy) acridine trihydrochloride The compound is prepared from 3,6-bis(2-chloroethoxy)acridine hydrochloride and ammonia as described in Example 15, giving 0.3 g. of the desired product as orange crystals, m.p. 274-275 C. ExamPle 22 3,6-bis (2-isopropylaminoethoxy)acridine trihydrochloride The compound is prepared from 3,6-bis(2-chloroethoxy)acridine hydrochloride and isopropylamine as described in Example 15, giving 1.1 g. of the desired product as yellow crystals, m.p. 232-2340C. Example 23 3,6-bis(s2-acetamidoethoxy)acridine 3,6-bis(2-aminoethoxy)acridine is treated with acetic anhydride/acetic acid followed by in vacuo removal of the volatiles, giving, after crystallization, the desired product. Example 24 3,6-bis(2-asetamideoethoxy)-4,5-dichloroacridine 3,6-bis(2-acetamidoethoxy)acridine is chlorinated as described in Example 1, giving the desired product. Example 25 3,6-bis L-3-chloropropoxy)acridine hydrochloride To a mixture of 11.80 g. of sodium hydride (61.14% ail dispersion) and 26.0 g. of 3,6-acridinediol sulfate (2:1) s added 250 ml. of dry N,N-dimethylformamide. The mixture is stirred at room temperature for 1.5 hours, then 49.8 g. of 3-chloropropyl-p-toluene sulfonate are added. This mixture is stirred at room temperature for 3 hours and 20 minutes, then at 500C. for 2 hours. The volatile materials are removed under reduced pressure at 35 -400C. and the residue is quenched with 1200 ml. of ice-cold saturated aqueous sodium bicarbonate solution. The resulting tan crystals are collected and dissolved in 500 ml. of chloroform. A 30 ml. portion of 6N hydrochloric acid in isopropanol is added and the mixture is diluted with ether. The solid is collected and recrystallized from ether, giving the desired product as tan cryatals, m.p. 211-213 C. Example 26 3, 6-bis ('2-isopropylaminopropoxy) acridine trihydrochloride The compound is prepared from 3,6-bis(3-chloropropoxy)acridine hydrochloride and isopropylamine as described in Example 15. Example 27 3,6-bis(3-diethylaminopropoxy)acridine trihydrochloride The compound is prepared from 3,6-bis(3-chloropropoxy)acridine hydrochloride and diethylamine as described in Example 15 except that the mixture is heated at 1000C. for 24 hours, giving 1.5 g. of the desired product as yellow crystals, m.p. 235-2360C. Example 28 3,6 -bis (:3npropylaminopropoxy) acridine trihydrochloride The compound is prepared from 3,6-bis(3-chloropropoxy)acridine hydrochloride and m-propylamine as described in Example 15, giving 1.54 g. of the desired product as yellow crystals, m.p. 260-2620C. Example 29 3,6-bis(3-n-butylaminopropyl)acridine trihydrochloride The compound is prepared from 3,6-bis(3-chloropro Po? acridine hydrochloride and n-butylamino as described in Example 15, giving 2.0 g. of the desired product as orange crystals, m.p. 247-2490C. Example 30 3,6-bis(3-ethylaminopropoxy)acridine trihydrochloride The compound is prepared from 3,6-bis(3-chloropro poxy)acridine'hydrochloride and ethylamine as described in Example 15, giving 1.4 g. of the desired product as yellow crystals, m.p. 265-2660C. Example 31 3,6-bis(3-methylaminopropoxy)acridine trihydrochloride The compound is prepared from 3,6-bis(3-chloropropoxy)acridine hydrochloride and methylamine as described in Example 15, giving 1.4 g. of the desired product as yellow crystals, m.p. 285-287 C. Example 32 3, 6-bis (4-aminobutoxy) acridine trihydrochloride The compound is prepared from 3,6-bis(4-chlorobutoxy)acridine hydrochloride and ammonia as described in Example 15. Example 33 3, 6-bis (2-diethylaminoethoxy) acridine-ferric chloride com plex A suspension of 3,6-bis(2-diethylaminoethoxy)acridine trihydrochloride and one equivalent of ferric chloride in ethanol is refluxed for 2 hours, concentrated and cooled giving the desired product as crystals which correspond to a 1:1 complex. Example 34 3,6-bis(2-diethylaminoethoxy)acridine zinc chloride com plex A suspension of 3 ,6-bis (2-diethylaminoethoxy) acri- dine free base and one equivalent of zinc chloride in ethanol is refluxed for 2 hours. The mixture is precipitated with ethyl acetate giving the 1:1 complex. Example 35 3,6-bis(2-diethylaminoethoxy)acridine-platinum chloride com plex. A suspension of 3, 6-bis (2-diethylaminoethoxy) acri- dine trihydrochloride and one equivalent of potassium hexachloropalmitate is refluxed in ethanol. The precipitate is collected giving the desired 1:1 complex. Example 36 3,6- (2-diethylaminoethoxy)acridine-chromium chloride com plex A suspension of 3,6-bisf2-diethylaminoethoxy)acri- dine and one equivalent of chromium chloride in ethanol is refluxed for 2 hours. The solvent is removed giving the desired 1:1 complex. Example 37 3,6-bis(2-diethylaminoethoxy)acridine-cupric chloride com plex A suspension of 3,6-bis(2-diethylaminoethoxy)aeri- dine trihydrochloride and one equivalent of cupric chloride ethanol is refluxed for 2 hours. Concentration and cooling gives the 1:1 adduct. Example 38 3,6-bis(2-dimethylaminoethoxy)acridine-cobalt complex A suspension of 3,6-bis (2-dimethyl aminoethoxy ) acri - dine trihydrochloride and one equivalent of cobalt nitrate in ethanol is refluxed for 2 hours. The solid is collected giving the desired 1:1 complex. Example 39 3,6-bis(2-aminoethoxy)acridine-copper complex A suspension of 3,6-bis(2-aminoethoxy)acridine and one equivalent of cupric chloride in ethanol is refluxed for 2 hours. Solvent removal gives the desired adduct. Example 40 3,6-bis(2-dimethylaminopropoxy)acridine-iron complex A suspension of 3,6-bis(2-dimethylaminopropoxy) acridine and one equivalent of ferric chloride in ethanol is refluxed for 2 hours. Solvent removal gives the desired complex. Example 41 2,6-bis(2-diethylaminoethoxy)-2(or 1)-amono-4,5-dichloroac- ridine The compound is prepared from 3,6-bis(2-diethylaminoethoxy)-2-nitro-4,5-dichloroacridine by reduction as described in Example 10. Example 42 3,6-bis[2-(4-methyl-l-piperazinyl)ethoxylacridine The compound is prepared from 3,6-bis(2-chloroethoxy)acridine hydrochloride and N-methylpiperazine as described in Example 15, except that the mixture is heated at 1000C. for 24 hours to attain reaction and that the free base is isolated. Example 43 3,6-bis[2-(1-morpholino)ethoxy]acridine The compound is prepared from 3,6-bis(2-chloroethoxy)acridine hydrochloride and morpholine as described in Example 42. Example 44 3, 6-bis [3- (1-piperidino) propoxy] acridine The compound is prepared from 3,6-bis(3-chloropropoxy)acridine hydrochloride and piperidine as described in Example 27, escept that the free base is isolated. Example 45 3,6-bis[3-(1-piperidino)propoxylacridine trihydrochloride The trihydrochloride salt of 3,6-bist3-(l-piperi- dino)propoxy)acridine is prepared as described in Example 15. Example 46 3,6-bis[3-(1-pyrrolyl)propoxylacridine The compound is prepared from 3,6-bis(3-chloropropoxy)acridine hydrochloride and pyrrole as described in Example 44. Example 47 3,6-bisE3-(4-methyl-1-piperazinyl)propoxylacridine The compound is prepared from 3,6-bis(3-chloropropoxy)acridine hydrochloride and N-methylpiperazine as described in Example 44. Example 48 3,6-bis(4-chlorobutoxy)acridine hydrochloride To a mixture of 11.8 g. of sodium hydride (61.1% dispersion in oil) and 26.0 g. of 3,6-acridinediol is added 250 ml. of dimethylformamide. The mixture is stirred at room temperature for 1.5 hours, then 52.5 g. of 4-chlorobu- tyl-p-toluenesulfonate are added. This mixture is stirred at room temperature for 3 hours and 20 minutes and then at 500C. for 2 hours. The volatile materials are removed under reduced pressure at 35-400C. The residue is quenched with 1200 ml. of ice-cold saturated aqueous sodium bicarbonate. The resulting tan crystals are collected and dissolved in 500 ml. of chloroform, 30 ml. of 6N hydrochloric acid in isopropanol are added and the mixture is diluted with ether, giving the desired product as the hydrochloride salt. Example 49 3,6-bis(4-diethylaminotutoxy)acridine trihydrochloride A mixture of 2.0 g. of 3,6-bis(4-chlorobutoxy) acridine hydrochloride and 150 ml. of diethylamine is heated in a steel bomb at 1000C for 24 hours. The excess diethylamine is removed under reduced pressure. The residue is dissolved in 150 ml. of chloroform and this chloroform solution is washed with two 30 ml. portions of saturated aqueous sodium bicarbonate, then dried over sodium sulfate and filtered. The chloroform is evaporated and the residue is dissolved in 50 ml. of absolute ethanol. A 10 ml. portion of 6N hydrochloric acid in isopropanol is added giving the desired product as yellow crystals. Example 50 3,6-bis(4-methylaminobutoxy)acridine trihydrochloride The compound is prepared from 3,6-bis(4-chlorobutoxy)acridine hydrochloride and methylamino as described in Example 15. Example 51 3', 6-bis (4-chloro-2-methylbutoxy) acridine hydrochloride The compound is prepared from 3,6-acridinediol and 4-chloro-2-methyl-l-butanolmethane sulfonate as described in Example 25. Example 52 3,6-bis(4-dimethyl-2-methylbutoxy)acridine trihydrochloride The compound is prepared from 3,6-bis(4-chloro-2- -methylbutoxy)acridine hydrochloride and dimethylamine as described in Example 27. Example 53 3,6-bis(4-amino-2-methylbutoxy)acridine hydrochloride The compound is prepared from 3,6-bis(4-chloro-2 -methylbutoxy)acridine hydrochloride and ammonia as described in Example 15. Example 54 4,5-dich}oro-3,6-bisl3-(1-piperidino)Propoxylacridine The compound is prepared from 3,6-bis[3-(l-piperi- dino)propoxyjacridine and N-chlorosuccinimide as described in Example 3. Example 55 4,5-dibromo-3,6-bisE2-(l-piperidino)ethoxy]acridine The compound is prepared from 3,6-bis[2-(1-piperi- dino)ethoxy3acridine and N-bromosuccinimide as described in Example 4. Example 56 4,5-dichloro-2,3-bisE2-(1-pipertdino)ethoxy]acridine The compound is prepared from 3,6-bis[2-(l-piperi- dino)ethoxy)acridine and N-chlorosuccinimide as described in Example 3. Example 57 3,6-bis[4-(1-piperidino)butoxylacridine trihydrochloride The compound is prepared from 3,6-bis(4-chlorobutoxy)acridine hydrochloride and piperidine as described in Example 44. Example 58 3,6-bis[4-(1-piperidino)-2-methylbutoxy)acridine trihydroch chloride The compound is prepared from 3,6-bis(4-chloro-2 -methylbutoxy)acridine hydrochloride and piperidine as described in Example 44. Example 59 3,6-bis[2-(1-pyrrolyl)ethoxy]acridine trihydrochloride The compound is prepared from 3,6-bis(2-chloroethoxy)acridine hydrochloride and pyrrole as described in Example 46. Example 60 4,5-dichloro-3,6-bis[2-(1-pyrrolyl)ethoxy]acridine The compound is prepared from 3,6-bis[2-(1-pyrrol- yl)athoxy) acridine trihydrochloride and N-chlorosuccinimide as described in Example 3.

Claims: We claim: 1. A compound selected from the group consisting of those of the formula: EMI39.1 wherein n is the integer 1, 2 or 3; R1 and R2 are each hydrogen or methyl; R3 and R4 are the same or different and are hydrogen or straight chain or branched alkyl (C1-C4); and R3 and R4 taken together with the associated N(itrogen) is pyrrolidino, piperidino, morpholino or N-methylpiperazino; and R5, R6 and R7 may be the same or different and are selected from the group consisting of hydrogen, fluoro, chloro, bromo and nitro; with the proviso that when n is one or two and R1 and R2 are hydrogen or methyl and R3 and R4 are lower alkyl then at least one of R5, R6 and R7 must be a substituent other than hydrogen; the pharmacologically acceptable metal complexes thereof and the pharmacologically acceptable acid-addition salts thereof. 2. The compounds according to Claim 1; 3,6-bis(2 -diethylaminoethoxy)-4,5-dichloro-2-nitroacridine, 3,6 -bis(2-diethylaminoethoxy)-4,5-dinitroacridine, 3,6-bis(2 -diethylaminoethoxy)-4,5-dichloroacridine, 3,6-bis(2-diethylaminoethoxy)-4,5-dibromoacridine, 3,6-bis(2-diethyl aminoethoxy) -4,5-dichloro-l, 7-dinitroacridine, 3, 6-bis (2- -diethylaminoethoxy) -4, 5-dibromo-2-nitroacridine, 3, 6-bis- (2-diethylaminoethoxy)-4,5-dibromo-1,7-dinitroacridine, 3, 6-bis (2-diethylaminoethoxy) acridine iron chloride complex, 3, 6-bis (2-diethylaminoethoxy) acridine platinum chloride complex, 2, 6-bis (2-diethylaminoethoxy) -2-amino-4 , - 5-dichloroacridine, and 3,6-bis(2-diethylaminoethoxy)-2 -nitroacridine. 3. The compounds according to Claim 1; 3,6-bis - (2-dimethylaminoethoxy) -1, 7-dichloroacridine, 3, 6-bis (2- -methylaminoethoxy) acridine trihydrochloride, 3, 6-bis (2- -n-propylaminoethoxy)acridine trihydrochloride, 3, 6-bis (2- -ethylaminoethoxy)acridine trihydrochloride, 3, 6-bis (2-n- -butylaminoethoxy)acridine trihydrochloride, 3,6-bis[2-(2 -hydroxyethylamino)ethoxy]acridine trihydrochloride, 3,6 -bis(2-aminoethoxy)acridine hydrochloride and 3, 6-bis (2- -isopropylaminoethoxy)acridine trihydrochloride. 4. The compounds according to Claim 1; 3,6-bis (2-sopropylaminopropoxy)acridine trihydrochloride, 3,6 -bis-(3-n-butylaminopropoxy)acridine trihydrochloride,3,6 -bis-(3-ethylaminopropoxy)acridine trihydrochloride, and 3,6-bis(3-methylaminopropoxy)acridine trihydrochloride. 5. The compounds according to Claim 1; 3,6-bis (4-aminobutoxy)acridine trihydrochloride, 3,6-bis(4-diethyl -aminobutoxy)acridine trihydrochloride, 3,6-bis(4-methyl -aminobutoxy)acridine trihydrochloride, 3, 6-bis (4-dime±hyl- -2-methylbutoxy)acridine trihydrochloride, and 3, 6-bis (4- -amino-2-methylbutoxy)acridine trihydrochloride. 6. The compounds according to Claim 1; 3,6-bis [2-(4-methyl-1-piperazinyl)ethoxy]acridine, and 3,6-bis[3 -(4-methyl-1-piperazinyl)propoxy)acridine. 7. The compound according to Claim 1; 3,6-bis [2-(1-morpholino)ethoxy]acridine, 8. The compounds according to Claim 1; 3,6-bis (2-diethylaminoethoxy)-4,5-dichloro-2-nitroacridine, 3,6 -bis(2-diethylaminoethoxy)-4,5-dinitroacridine, 3,6-bis(2 -diethylaminoethoxy)-4,5-dichloroacridine, 3,6-bis (2-diethylaminoethoxy)-4,5-dibromoacridine, 3,6-bis(2-diethylaminoetnoxy)-4,5-dichloro-1,7-dinitroacridine, 3,6-bis [3-(1-piperidino)propoxylacridine, 3,6-bis[3-(1-piperidino) propoxy]acridine trihydrochloride, 4,5-dichloro-3,6-bis[3 -(l-piperidino)propoxy]acridine, 4,5-dibromo-3,6-bis[2-(1 -piperidino)ethoxy]acridine, 4,5-dichloro-3,6-bis[2-(1-piperidino)ethoxy]acridine, 4,5-dichloro-3,6-bis[2-(1-piperidino)ethoxy]acridine, 3,6-bis[4-(1-Piperidino)butoxy]acridine trihydrochloride, and 3,6-bis[4-(1-piperidino)-2- -methylbutoxy) acridine trihydrochloride. 9. The compounds according to Claim 1; 3,6-bis [3- (l-pyrrolyl)propoxy] acridine, 3,6-bis[2-(1-pyrrolyl)- ethoxy]acridine trihydrochloride, and 4, 5-dichloro-, 3,6- -bis[2-(1-pyrrolyl)ethoxy]acridine. 10. The process of preparing compounds of the formula: EMI41.1 wherein n is the integer 1, 2 or 3; R1 and R2 are each hydrogen or methyl; R3 and R4 are the same or different and are hydrogen or straight chain or branched alkyl (C1-C4); and R3 and R4 taken together with the associated N(itrogen) is pyrrolidino, piperidino, morpholino or N-methylpiperazino; and R5, R6 and R7 may be the same or different and are selected from the group consisting of hydrogen, fluoro, chloro, bromo and nitro; with the proviso that when n is one or two and R1 and R2 are hydrogen or methyl and R3 and R4 are lower alkyl then at least one of R5, R6 and R7 must be a substituent other than hydrogen; which comprises condensing a substituted 3,6-acridinediol disodium salt of the formula: EMI41.2 wherein R5, R6 and R7 are as hereinbefore defined with two mole equivalents of an alkyl halide of the formula: EMI42.1 wherein X is chloro or bromo and R1, R2, R3 and R4 are as hereinbefore defined in an inert solvent at 75"-100"C. for a period of time sufficient for a substantial degree of condensation to occur; and, if desired, forming the metal complexes or acid-addition salts thereof.

Inventors: DAMIANI, MARTIN ROBERT, DURR, FREDERICK EMIL, MURDOCK, KEITH CHADWICK
Applicants: AMERICAN CYANAMID COMPANY
Application year: 1980
Main classification: C07D219
IPC codes: A61K31, A61P37, C07D219, A61P43, A61P35