Amino disulfide thiol exchange products

Abstract

This invention refers to 7-amino mitosane analogs (mitomycin C) in which the 7-amino group bears an organic substituent incorporating a disulfide group and to a novel thiol exchange process for producing these compounds. The compounds are inhibitors of experimental animal tumors.

Description

FIELD OF THE INVENTION

The present compounds are mitomycin C analogs (Class 548, Subclass 422) in which the 7-amino group is substituted by a disulfide containing organic group. These compounds are inhibitors of experimental animal tumors.

BACKGROUND OF THE INVENTION

Nomenclature--The systematic Chemical Abstracts name for mitomycin C is (Shirahata et al., J. Am. Chem. Soc. 1983, 105, 7199-7200):

[1aS-(1a.beta.,8.beta.,8a.alpha.,8.beta.)]-6-amino-8-[(aminocarbonyl)oxy)methyl]-1,1a,2,8,8a,8b-hexahydo-8a-methoxy-5-methylarizidino[2',3',3,4,]pyrrolo[1,2-a]indole-4,7-dione according to which the azirinopyrroloindole ring system is numbered as follows: ##STR1##

A trivial system of nomenclature which has found wide use in the mitomycin literature identifies the foregoing ring system including several of the characteristic substituents of the mitomycins as mitosane. ##STR2## We have chosen in the present specification to use this system and to refer to the aziridino nitrogen atom as 1a and the ring amino nitrogen atom as 7-NH.sub.2. As to the stereochemical configuration of the products of this invention, it is intended when identifying them by the root name "mitosane" or by structural formula to identify the stereochemical configuration thereof as the same as that of mitomycin C.

DESCRIPTION OF THE PRIOR ART

Mitomycin C is an antibiotic which is produced by fermentation and is presently on sale under Food and Drug Administration approval for the therapy of disseminated adenocarcinoma of the stomach or pancreas in proven combinations with other approved chemotherapeutic agents and as palliative teatment when other modalities have failed (Mutamycin.RTM. Bristol Laboratories, Syracuse, N.Y. 13201, Physicians' Desk Reference 35th Edition, 1981, pp. 717 and 718). Mitomycin C and its production by fermentation is the subject of U.S. Pat. No. 3,660,578 patented May 2, 1972 claiming priority from earlier applications including an application filed in Japan on Apr. 6, 1957.

The structures of mitomycins A, B, C, and of porfiromycin were first published by J. S. Webb et al. of Lederle Laboratories Division American Cyanamid Company, J. Amer. Chem. Soc. 84, 3185-3187 (1962). One of the chemical transformations used in this structure study to relate mitomycin A and mitomycin C was the conversion of the former, 7-9.alpha.-dimethoxymitosane, by reaction with ammonia to the latter, 7-amino-9.alpha.-methoxymitosane. Displacement of the 7-methoxy group of mitomycin A has proven to be a reaction of considerable interest in the preparation of antitumor active derivatives of mitomycin C. The following articles and patents deal with the conversion of mitomycin A to 7-substituted amino mitomycin C derivatives having antitumor activity. The object of this research was to prepare derivatives which were more active, and particularly which were less toxic than mitomycin C:

Matsui et al. The Journal of Antibiotics, XXI, 189-198 (1968).

Kinoshita et al. J. Med. Chem. 14, 103-109 (1971). Iyengar et al. J. Med. Chem. 24, 975-981 (1981). Iyengar, Sami, Remers, and Bradner, Abstracts of Papers 183rd Annual Meeting of the American Chemical Society, March 1982, No. MEDI 72. Iyengar et al. J. Med. Chem. 1983, 26, 16-20. Iyengar et al. Abstracts of Papers, 185th Annual Meeting of the American Chemical Society, March 1983, No. MEDI 82.

The following patents deal with the preparation of 7-substituted aminomitosane derivatives by the reaction of mitomycin A, mitomycin B, or an N.sup.1a -substituted derivative thereof with a primary or secondary amine:

Cosulich et al. U.S. Pat. No. 3,332,944 patented July 25, 1967. Matsui et al. U.S. Pat. No. 3,420,846 patented Jan. 7, 1969. Matsui et al. U.S. Pat. No. 3,450,705 patented June 17, 1969. Matsui et al. U.S. Pat. No. 3,514,452 patented May 26, 1970. Nakano et al. U.S. Pat. No. 4,231,936 patented Nov. 4, 1980. Remers, U.S. Pat. No. 4,268,676 patented May 19, 1981. Remers, Belg. No. 893,162 patented May 12, 1982.

Mitomycin C derivatives having a substituted amino substituent in the 7-position have also been prepared by directed biosynthesis, that is by supplementing fermentation broths with a series of primary amines, and carrying out the conventional mitomycin fermentation (C. A. Claridge et al. Abst. of the Annual Meeting of Amer. Soc. for Microbiology 1982. Abs. 028).

SUMMARY OF THE INVENTION

The present invention relates to a process for the preparation of the compounds claimed in U.S. Ser. No. 581,291 which are represented by Formula IX below. The process is depicted in the reaction scheme shown. ##STR3##

In Formula IX R.sup.9 is an organic group, viz. the structural component of an organic thiol of the Formula R.sup.9 SH. R and Alk.sub.2 have the definitions given in U.S. Ser. No. 581,291 viz. R is hydrogen, lower alkyl, lower alkanoyl, benzoyl, or substituted benzoyl wherein said substituent is lower alkyl, lower alkoxy, halo, amino, or nitro. Alk.sub.2 is a straight or branched chain alkylene group having 2 to 7 carbon atoms and optionally bearing an R.sup.7 substituent wherein said R.sup.7 is selected from the group consisting of hydroxy, halo, amino, alkylamino or dialkylamino having 1 to 12 atoms, alkanoylamino, benzoylamino or A-substituted benzoylamino, naphthoylamino or A-substituted naphthoylamino, cycloalkyl or A-substituted cycloalkyl each having 3 to 8 members, cycloalkenyl or A-substituted cycloalkenyl each having 5 to 8 ring members, phenyl or A-substituted phenyl, naphthyl or A-substituted naphthyl, a heterocyclic group selected from the group consisting of heteroaromatic and heteroalicyclic groups having from 1 to 2 rings, from 3 to 8 ring members in each ring, and from 1 to 4 hetero atoms selected from oxygen, nitrogen, and sulfur, alkoxy or alkythio each having 1 to 6 carbon atoms, carboxy, alkoxycarbonyl having 1 to 7 carbon atoms, phenoxycarbonyl or A-substituted phenoxy, naphthoxy or A-substituted naphthoxy, alkoxycarbonylamino having 2 to 6 carbon atoms, guanidino, ureido (--NHCONH.sub.2), N-alkylureylene (--NHCONHalkyl) having 2 to 7 carbon atoms, N.sup.3 -haloalkylureylene having 3 to 7 carbon atoms, N.sup.3 -haloalkyl-N.sup.3 -nitrosoureylene having 3 to 7 carbon atoms, and dialkylaminocarbonyl having 3 to 13 carbon atoms, wherein said A substituent is selected from the group consisting of one or two lower alkyl, lower alkanoyl, lower alkoxy, halo, amino, hydroxy, or nitro groups. The entire disclosure of U.S. Ser. No. 581,291 is incorporated herein by reference.

In the operation of the present process a number of novel compounds of Formula IX have been produced. These compounds have antitumor activity and inhibit the growth of experimental animal tumors. They are considered part of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The reagent employed in the present process in reaction with thiols of the Formula R.sup.9 SH is referred to as Compound No. 30. The preparation thereof is described in U.S. Ser. No. 581,291 in Procedure No. 30 where it is also referred to as Compound No. 30. This is a particularly preferred reactant because of the stability of the by-product 3-nitro-2-pyridyldthione which is produced in the process and which is believed to provide a driving force for completion of the reaction. A similar disulfide thiol exchange process has been described by Kono et al. in European Patent Application Publication No. 0116208 published Aug. 22, 1984. In that process the 2-pyridylsulfide corresponding in structure to Compound No. 30 is employed. 3-Nitro-1-pyridylthione is a more facile leaving group, and as a result the present process enjoys certain advantages over that process.

The process as described in the above reaction scheme takes place at a temperature in the range of 0 to 60 deg. C., the particular temperature being chosen on the basis of the reactivity of the thiol and the stability of the product produced. The reaction is carried out in a reaction inert liquid medium preferably one in which the reactants are soluble. At least one chemical equivalent of the thiol R.sup.9 SH relative to Compound 30 is employed. It is preferable to carry out the reaction in the presence of a base such as a tertiary amine. With water-soluble thiol reactants, water may be used as the reaction inert liquid medium and sodium bicarbonate is preferred as the base. Approximately one chemical equivalent of base per quantity of Compound 30 is employed. Suitable reaction inert liquid media include lower alkanols, such as methanol, ethanol, and isopropanol, lower alkanoic lower alkyl esters such as ethyl acetate, methyl propionate, and butyl acetate may be employed. Other appropriate reaction media include lower aliphatic ketones such as acetone and methylethyl ketone, cyclic aliphatic ethers such as tetrahydrofuran and lower polyhalogenated aliphatic hydrocarbons such as methylene chloride, ethylene dichloride, and chloroform.

DESCRIPTION OF SPECIFIC EMBODIMENTS

In the following procedures and examples, all temperatures are given in degrees centigrade, and melting points are uncorrected. Proton nuclear magnetic resonance (.sup.1 H NMR) spectra were recorded on Joel FX-90Q or Bunker VM 360 spectrometer in either pyridine-d.sub.5 or D.sub.2 O as indicated. When pyridine-d.sub.5 was used as the solvent, the pyridine resonance at 8.57 PPM was used as an internal reference, whereas with D.sub.2 O as solvent trimethylsilylpropane sulfonic acid (TSP) was used as the internal reference. Chemical shifts are reported in parts per million (PPM), and integrals proportional to the areas under each shift are reported. Where splitting patterns are given, the following abbreviations are used: s, singlet; d, doublet; t, triplet; q, quartet; m, multiplet; bs, broad singlet; dd, double of doublets; dt, doublet of triplets. Where they are not given, the data presented are sufficient to provide such analysis if desired. Infrared spectra (IR) were determined either on a Beckman Model 4240 spectrometer or a Nicolet 5DX FT-IR spectrometer and are reported in reciprocal centimeters. Ultraviolet (UV) spectra were determined either on a Cary Model 290 spectrometer or a Hewlitt Packard 8450A spectrometer equipped with a multidiode array detector. Thin layer chromatography (TLC) was carried out on 0.25 mm Analtech silica gel GF plates or Whatmann MK6F silica gel plates. Flash chromatography was run with either Woelm neutral alumina (DCC grade) or Woelm silica gel (32-63 .mu.m) and the indicated solvents. Reverse phase high pressure liquid chromatography (HLPC) was performed on .mu. Bondpack-C.sub.18 column using Waters 6000 pump which is equipped with a Waters 440 UV detector. Reverse phase column chromatography was performed using C-18 silica gel in solvents indicated. All evaporations of solvents were performed under reduced pressure and below 40 eg. C.

The process was applied in one of two procedures using various thiols as reactant with 7-[2-(3-nitro-2-pyridyldithio)ethylamino]-9a-methoxymitosane. The latter has been previously described in application Ser. No. 581,291 filed Feb. 24, 1984 and its preparation more particularly below.

7-[2-(3-Nitro-2-pyridyldithio)ethylamino]-9a-methoxymitosane

To a solution of 7-dimethylaminomethyleneamino-9a-methoxymitosane (1.0 g, 2.61 mM) in deoxygenated methanol (15 ml) was added triethylamine (1.1 ml, 7.83 mM) under stirring and ice bath temperature (0 deg. ca. 4 deg. C.). The reaction mixture was sonicated and allowed to stir at ca. 22 deg. C. for 24 hours. Thin layer chromatography (silica gel, 10% CH.sub.3 OH in CH.sub.2 Cl.sub.2) revealed that >90% of the starting compound (green) had been converted to the desired blue compound. The reaction mixture was concentrated under reduced pressure and the resulting residue was chromatographed in 1".times.16" column packet with silica gel in 5% MeOH in CH.sub.2 Cl.sub.2. Gradient elution with MeOH, 1-5% v/v in CH.sub.2 Cl.sub.2 afforded the title compound as a pure bluish amorphous solid (430 mg). The spectral properties of this material are in agreement with those reported in U.S. Ser. No. 582,291.

Method A--Preferred For Lipophilic Products

To a deoxygenated solution of 7-[2-(3-nitro-2-pyridyldithio)ethylamino]-9a-methoxymitosane (ca. 1.1 equiv.) in acetone (3-5 ml) is added with stirring, under an argon or nitrogen atmosphere, triethylamine (ca. 1.1 equiv.) followed by dropwise or portionwise addition of the thiol reactant (1 equiv.) in acetone (1-2 ml). The progress of the reaction is monitored by silica gel thin layer chromatography (10% MeOH in CH.sub.2 Cl.sub.2), unless the starting nitropyridyldithio mitosane reactant and the product have similar Rf values. In such instances HPLC monitoring is employed (.mu. Bondpack-C.sub.18). The completion of the reaction is apparent when disappearance of the reactant and appearance of the product occurs. At this point the reaction mixture is concentrated under reduced pressure (ca. 30 deg. C.) and the residue chromatographed on a neutral Woelm alumina column (1/4.times.10") packed employing 2-5% MeOH in CH.sub.2 Cl.sub.2 for slurrying. This procedure separates the desired mitosane product from the pyridyl thione byproduct which remains on the column. The product thus eluted using 2% MeOH in CH.sub.2 Cl.sub.2 is further purified by flash silica gel chromatography using 5-7%. MeOH in CH.sub.2 Cl.sub.2 as the eluting solvent. The major band corresponding to product is isolated and the amorphous product characterized.

Examples 1-25 employ method A applied to various neutral lipophilic thiols or those containing basic groups.

Method B--Preferred for Hydrophilic Products

To solution of 7-[2-(3-nitro-2-pyridyldithio)ethylamino]-9a-methoxymitosane (ca. 0.1 mM) in methanol (10 ml) containing 2-5% v/v of acetone (or 2-5% v/v methylene chloride) is added sat. aq. NaHCO.sub.3 solution (6 drops), and a methanolic solution of 1 chemical equivalent of the thiol, volume ca. 1 ml water may be used as solvent for the thiol if the water solubility thereof is sufficient. The progress of the reaction is monitored by thin layer chromatography (silica gel, 10% MeOH in CH.sub.2 Cl.sub.2). At the completion of reaction, the reaction mixture is diluted with water (15 ml) and concentrated to ca. 10 ml on a rotavapor at 30 deg. C. The resulting solution is chromatographed on a reverse phase C-18 column with stepwise gradient elution (100% H.sub.2 O to 80% MeOH in H.sub.2 O). The product is eluted after elution of the by-product thione at the increased methanol concentrations. The product appears as a major blue fraction, which is collected, and concentrated to yield an amorphous solid. If further purification is needed the above chromatograph step is repeated.

Examples 26-30 employ Method B applied to various thiols containing salt-forming groups.

EXAMPLE 1

7-[2-(4-Chlorophenyldithio)ethylamino]-9a-methoxymitosane (39).--Method A employing 4-chlorothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTEGRAL______________________________________3143.874 8.7297 .7182739.107 7.6058 .1112729.688 7.5796 1.0522721.412 7.5567 .5932718.682 7.5491 .0972669.282 7.4119 .5852667.385 7.4066 .1082662.528 7.3932 .1182660.613 7.3878 .3672650.480 7.3597 .0642608.945 7.2444 .1842602.620 7.2268 .2822596.156 7.2089 .9841954.657 5.4276 .1891950.505 5.4161 .1441944.312 5.3989 .1701940.091 5.3871 .1641847.791 5.1308 .2031837.219 5.1015 .2711826.720 5.0723 .1801774.500 4.9273 2.8841637.494 4.5469 .3371624.753 4.5115 .3341452.696 4.0338 .1681448.520 4.0222 .1721441.467 4.0026 .1711437.340 3.9911 .1571404.385 3.8996 .2211397.740 3.8812 .4551391.049 3.8626 .4541384.386 3.8441 .1961302.465 3.6166 .3511290.130 3.5824 .2681178.026 3.2711 .0771164.985 3.2349 1.8501134.073 3.1490 .6261095.041 3.0406 .3901088.318 3.0220 .6081081.611 3.0034 .307992.057 2.7547 .684772.470 2.1450 .197766.114 2.1273 .340734.164 2.0386 1.886-.000 -.0000 2.063______________________________________

IR (KBr, .nu..sub.max, cm.sup.-1): 3440, 3280, 2950, 1720, 1635, 1560, 1510, 1474, 1450, 1325, 1060.

UV (MeOH, .lambda..sub.max, nm): 368, 238(sh), 220.

EXAMPLE 2

7-[2-(4-Bromophenyldithio)ethylamino]-9a-methoxymitosane (47).--Method A employing 4-bromothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.651 8.5709 89.6712692.567 7.4766 1.3602670.818 7.4162 68.6212659.543 7.3849 6.1612657.684 7.3797 16.5912648.749 7.3549 17.5572641.944 7.3360 4.2392639.909 7.3304 8.3642638.621 7.3268 9.9692626.614 7.2935 2.4012624.367 7.2872 7.6732617.778 7.2689 2.2702615.699 7.2632 4.3122587.041 7.1836 1.3222582.594 7.1712 1.0492578.892 7.1610 1.0832551.216 7.0841 3.9862538.742 7.0495 81.0021898.031 5.2704 2.6881893.978 5.2591 2.4991887.686 5.2417 3.4131883.492 5.2300 2.7971778.104 4.9374 1.2831727.439 4.7967 13.8891581.651 4.3919 4.8121575.060 4.3736 1.5341568.837 4.3563 4.9921395.824 3.8759 2.8291391.542 3.8640 2.9311384.700 3.8450 3.0591380.440 3.8332 2.5211345.894 3.7372 2.2651339.257 2.7188 6.1271332.587 3.7003 6.5131325.939 3.6818 2.7541247.979 3.4653 1.6991235.355 3.4303 1.6471109.433 3.0806 12.7991107.467 3.0752 43.9841097.943 3.0487 1.3011090.735 3.0287 1.2841084.521 3.0115 2.4651078.013 2.9934 2.8251035.937 2.8765 4.6351029.085 2.8575 8.0151022.373 2.8389 4.583934.207 2.5941 2.907920.895 2.5571 2.572715.422 1.9866 1.426676.497 1,8785 29.005______________________________________

EXAMPLE 3

7-[2-(4-Fluorophenyldithio)ethylamino]-9a-methoxymitosane (46).--Method A employing 4-fluorothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3094.793 8.5935 2.9493086.092 8.5693 71.4002692.617 7.4767 3.2352687.390 7.4622 3.9802684.098 7.4531 4.2652678.931 7.4387 5.8982670.028 7.4140 53.7862547.257 7.0731 3.8422538.009 7.0474 68.6312523.997 7.0085 7.5432515.342 6.9845 3.8611897.552 5.2690 1.4991893.349 5.2574 1.6231887.153 5.2401 1.9381883.067 5.2288 1.8011779.560 4.9414 1.3181722.527 4.7830 12.5661578.645 4.3835 2.9311565.979 4.3483 3.2341394.123 3.8711 1.7391389.902 3.8594 2.0781382.885 3.8399 1.8551378.856 3.8287 1.7061351.510 3.7528 1.4691344.836 3.7343 4.0571338.216 3.7159 4.4631331.635 3.6976 2.0771244.124 3.4546 1.2931231.741 3.4202 1.2221106.270 3.0718 21.9731083.640 3.0090 1.3981077.831 2.9929 1.6531039.104 2.8853 3.1991032.385 2.8667 5.9331025.696 2.8481 3.204932.666 2.5898 1.743711.666 1.9761 1.244693.178 1.9248 1.762679.305 1.8863 16.668______________________________________

IR (KBr, .nu..sub.max, cm.sup.-1): 3430, 3290, 2920, 1720, 1640, 1560, 1510, 1450, 1330, 1220, 1060.

UV (MeOH, .lambda..sub.max, nm): 370, 222.

EXAMPLE 4

7-[2-(2-Chlorophenyldithio)ethylamino]-9a-methoxymitosane (55).--Method A employing 2-chlorothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.658 8.5709 354.9202789.230 7.7450 3.7882781.178 7.7226 3.9032670.412 7.4151 203.1982637.641 7.3241 1.2512619.047 7.2724 2.5382608.912 7.2443 4.0082601.011 7.2224 4.9912589.766 7.1911 4.8022582.103 7.1699 2.6842538.357 7.0484 328.9542523.173 7.0062 5.0842515.145 6.9839 2.7551896.130 5.2651 1.9171891.886 5.2533 2.0571885.611 5.2359 2.2621881.627 5.2248 2.6011778.080 4.9373 1.1201730.238 4.8044 7.5221574.972 4.3733 3.7651562.242 4.3380 4.0631392.854 3.8676 2.1961388.576 3.8557 2.0541381.591 3.8363 2.0361377.677 3.8255 1.7221349.813 3.7481 1.6651342.946 3.7290 4.1421336.349 3.7107 4.2171329.647 3.6921 1.9631245.714 3.4590 1.6251234.390 3.4276 1.4481104.953 3.0682 28.5341074.486 2.9836 2.3191031.569 2.8644 3.9101024.929 2.8460 7.1451018.285 2.8275 3.493932.398 2.5890 2.552814.080 2.2605 1.350723.808 2.0098 1.102677.286 1.8807 23.661______________________________________

EXAMPLE 5

7-[2-(2-Bromophenyldithio)ethylamino]-9a-methoxymitosane (65).--Method A employing 2-bromothiophenyl

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3088.884 8.5771 89.7912790.861 7.7495 1.8582783.064 7.7279 1.8132673.036 7.4223 53.9652664.964 7.3999 2.4212618.223 7.2701 1.1132610.639 7.2491 1.7622602.928 7.2277 1.1022541.000 7.0557 85.5662503.916 6.9527 1.0662496.358 6.9318 1.6341897.870 5.2699 1.0131893.745 5.2585 1.0021887.532 5.2412 1.1211883.415 5.2298 1.0571786.096 4.9595 .9671722.377 4.7826 6.9181576.483 4.3775 1.6241563.921 4.3426 1.6081394.999 3.8736 1.1791390.756 3.8618 1.2501383.913 3.8428 1.1221379.766 3.8313 .9931344.182 3.7325 2.0051337.507 3.7139 2.0711330.434 3.6943 .8861246.383 3.4609 1.4481233.693 3.4257 .8681107.612 3.0756 13.5421079.502 2.9975 1.0121033.690 2.8703 1.9641026.784 2.8511 3.4631020.295 2.8331 1.614934.405 2.5946 1.081712.878 1.9795 .946680.366 1.8892 8.887______________________________________

EXAMPLE 6

7-[2-(2,6-Dichlorophenyldithio)ethylamino]-9a-methoxymitosane (52).--Method A employing 2,6-dichlorothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3096.025 8.5969 8.9893086.614 8.5707 262.2132757.647 7.6573 1.5022749.367 7.6343 2.2182681.319 7.4453 6.5462670.136 7.4143 186.2732628.286 7.2981 6.8632620.169 7.2755 9.7172609.009 7.2446 5.9662600.963 7.2222 7.4382588.248 7.1869 2.1172575.576 7.1517 2.0862547.255 7.0731 10.3602538.154 7.0478 246.9872480.023 6.8864 2.3212456.668 6.8215 1.8521887.908 5.2422 2.3961883.629 5.2304 2.8721877.625 5.2137 2.7601873.527 5.2023 2.3331769.319 4.9130 1.8691731.124 4.8069 27.1381574.128 4.3710 3.6461568.549 4.3555 2.2071561.432 4.3357 3.7441393.054 3.8682 1.6001378.772 3.8285 5.5971371.943 3.8095 5.8061247.970 3.4653 2.4671234.722 3.4285 2.4531106.516 3.0725 5.4041102.314 3.0608 31.2171084.696 3.0119 2.8851078.844 2.9957 5.6111073.435 2.9807 7.6111059.705 2.9425 1.6951029.741 2.8593 1.9061022.765 2.8400 2.499931.917 2.5877 3.399920.768 2.5567 3.018715.360 1.9864 7.831694.846 1.9294 20.393680.187 1.8887 2.738______________________________________

EXAMPLE 7

7-[2-(2,4-Dichlorophenyldithio)ethylamino]-9a-methoxymitosane (50).--Method A employing 2,4-dichlorothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3104.914 8.6216 1.9223095.765 8.5962 4.0523086.609 8.5707 182.0922757.604 7.6572 5.7582748.941 7.6331 6.1432680.773 7.4438 2.4312670.316 7.4148 91.1682649.396 7.3567 2.9422647.244 7.3507 3.0442642.923 7.3387 4.7352640.803 7.3328 5.3302618.698 7.2715 1.6142614.924 7.2610 3.8142612.799 7.2551 3.4102606.232 7.2369 2.7802604.107 7.2310 2.6352581.846 7.1691 2.3912579.685 7.1631 2.3062573.061 7.1447 2.7462571.061 7.1392 2.5372565.809 7.1246 2.7592557.328 7.1011 2.3892549.032 7.0780 3.2302538.315 7.0483 160.7961897.970 5.2702 2.2121893.650 5.2582 2.7221887.692 5.2416 2.8931883.310 5.2295 3.0841732.330 4.8102 7.5761578.543 4.3832 3.9681565.749 4.3477 4.4561395.962 3.8762 2.5441391.700 3.8644 2.7051384.733 3.8451 2.7831380.505 3.8333 2.4951353.560 3.7585 1.7981346.688 3.7394 4.1961339.996 3.7208 4.3431333.396 3.7025 2.1761247.381 3.4637 2.1131234.770 3.4286 1.9961106.762 3.0732 30.6941103.861 3.0651 9.7331097.728 3.0481 1.7411072.702 2.9786 2.5311037.593 2.8811 3.3721030.795 2.8623 6.4511023.941 2.8432 4.061932.000 2.5879 2.626715.409 1.9865 5.066680.055 1.8883 20.943______________________________________

EXAMPLE 8

7-[2-(3-Chlorophenyldithio)ethylamino]-9a-methoxymitosane (58).--Method A employing 3-chlorothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3085.348 8.5672 71.3642713.519 7.5348 4.4912669.389 7.4122 42.7332641.517 7.3348 2.4202635.412 7.3179 2.6382617.780 7.2689 1.1982571.300 7.1399 2.4742563.321 7.1177 5.3022557.187 7.1007 8.0242537.316 7.0455 69.1301894.009 5.2592 1.7111889.794 5.2475 1.8051883.499 5.2300 1.9071879.433 5.2187 1.7771778.965 4.9397 1.3521724.502 4.7885 3.2651575.192 4.3739 2.8621562.650 4.3391 2.7791392.023 3.8653 1.8111387.906 3.8539 1.9481381.000 3.8347 1.9551376.859 3.8232 1.6661344.147 3.7324 1.7811337.633 3.7143 3.4851331.146 3.6963 3.4851324.709 3.6784 1.7151243.697 3.4534 1.3651231.901 3.4207 1.3571104.883 3.0680 17.2101073.619 2.9812 1.8801033.597 2.8700 3.3161026.901 2.8514 5.1491020.257 2.8330 2.821932.403 2.5890 2.072710.311 1.9724 1.386692.134 1.9219 1.843674.921 1.8741 14.080______________________________________

EXAMPLE 9

7-[2-(2,5-Dichlorophenyldithio)ethylamino]-9a-methoxymitosane (57).--Method A employing 2,5-dichlorothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3085.997 8.5690 93.1512789.295 7.7452 2.5222788.014 7.7416 2.4612781.668 7.7240 2.6722670.153 7.4143 52.3892662.006 7.3917 1.0222637.937 7.3249 .8172619.105 7.2726 1.2272608.923 7.2443 2.8962607.821 7.2413 2.9142600.569 7.2211 3.1372597.281 7.2120 1.9962589.809 7.1912 3.3152581.491 7.1681 2.2662577.499 7.1571 1.3122573.116 7.1449 1.5652538.173 7.0479 85.5262530.928 7.0278 2.4292523.065 7.0059 2.3362521.838 7.0025 2.3122515.673 6.9854 1.3852514.297 6.9816 1.2491894.281 5.2599 1.7311889.986 5.2480 1.9351883.930 5.2312 1.9551879.631 5.2193 1.8231778.344 4.9380 1.0341721.287 4.7796 2.7831573.832 4.3701 3.2071561.153 4.3349 3.0941391.698 3.8644 1.7931387.597 3.8530 1.9781380.523 3.8334 1.8091376.417 3.8220 1.5271349.161 3.7463 1.4451342.688 3.7283 3.0301335.992 3.7097 3.1091329.527 3.6918 1.4801245.053 3.4572 1.1191233.053 3.4239 1.0551109.056 3.0796 4.2271104.734 3.0676 21.5811083.720 3.0092 1.3291077.008 2.9906 1.5261031.596 2.0645 3.0391024.781 2.0456 4.8201017.982 2.8267 2.464933.976 2.5934 1.604837.857 2.3265 1.306835.753 2.3207 1.763833.609 2.3147 2.246831.269 2.3082 1.735709.321 1.9696 1.093692.847 1.9239 2.684677.031 1.8799 14.762______________________________________

IR(KBr, .nu..sub.max cm.sup.-1): 3450, 3290, 2930, 1720, 1640, 1560, 1515, 1475, 1455, 1330, .+-.065.

UV(MeOH, .nu..sub.max nm): 367, 218.

EXAMPLE 10

7-[2-(3,4-Dichlorophenyldithio)ethylamino]-9a-methoxymitosane (61).--Method A applied to 3,4-dichlorothiophenol

.sup.1 H NMR data (pyridine) d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3084.858 8.5659 22.6512737.563 7.6015 6.9552669.762 7.4133 14.0632640.258 7.3313 2.5082631.654 7.3074 11.8442621.027 7.2779 1.3712552.501 7.0877 3.1092546.297 7.0704 5.0722537.654 7.0464 22.1161894.292 5.2600 2.5361890.094 5.2483 2.5061883.970 5.2313 2.8551879.783 5.2197 2.4301772.587 4.9220 1.4141576.225 4.3768 4.0991563.539 4.3416 4.2121393.191 3.8685 2.7741389.009 3.8569 2.8181381.991 3.8374 2.7141377.894 3.8261 2.2741349.938 3.7484 2.6761343.449 3.7304 5.6501336.929 3.7123 5.6511330.508 3.6945 2.5131246.457 3.4611 2.1361234.069 3.4267 1.9331106.375 3.0721 27.8961073.644 2.9812 3.0911044.916 2.9015 4.7991038.298 2.8831 7.7791031.673 2.8647 3.943933.135 2.5911 3.175919.103 2.5521 1.877712.794 1.9792 1.524708.146 1.9663 1.502676.000 1.8771 23.605______________________________________

EXAMPLE 11

7-[2-(3-Trifluoromethylphenyldithio)ethylamino]-9a-methoxymitosane (51).--Method A applied to 3-trifluoromethylthiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3096.041 8.5969 3.9793086.601 8.5707 191.3942816.428 7.8205 4.0462766.458 7.6817 2.6142759.037 7.6111 2.9442680.739 7.4437 2.3542670.277 7.4147 94.7282653.288 7.3675 4.5652646.995 7.3500 3.3642639.249 7.3285 3.5132549.619 7.0796 4.0142538.277 7.0481 168.3331890.555 5.2496 2.0541884.287 5.2322 2.2691880.154 5.2207 2.2441730.088 4.8040 36.4621573.873 4.3702 3.6491561.173 4.3350 3.9931391.847 3.8648 2.1331387.644 3.8531 2.3071380.627 3.8336 2.2051342.397 3.7275 3.8871335.818 3.7092 4.2711109.074 3.0796 2.6221104.563 3.0671 31.7551046.186 2.9050 3.5311039.326 2.8859 6.4321032.615 2.8673 3.667932.644 2.5897 2.040671.477 1.8645 21.716______________________________________

EXAMPLE 12

7-[2-(3-Methoxyphenyldithio)ethylamino]-9a-methoxymitosane (54).--Method A applied to 3-methoxythiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.415 8.5702 562.7242670.763 7.4160 276.0992590.589 7.1934 24.2122588.595 7.1879 34.7602586.537 7.1822 24.6742584.829 7.1774 15.8562576.794 7.1551 33.2092563.954 7.1333 30.0012561.309 7.1121 34.1292560.105 7.1088 23.5502553.236 7.0897 20.3672533.633 7.0491 496.4302526.218 7.0147 8.1942425.701 6.7356 15.3792422.569 6.7269 14.3072417.424 6.7126 12.7492415.676 6.7077 13.0451892.375 5.2560 14.1431888.677 5.2444 14.2281882.529 5.2273 17.2851873.267 5.2155 15.5371772.130 4.9208 5.7091719.455 4.7745 11.0351576.419 4.3773 26.7981563.627 4.3418 28.1241391.474 3.8638 13.7691337.333 3.8523 14.6721380.333 3.8328 15.2881376.094 3.3211 12.4701352.786 3.7563 9.5571345.640 3.7365 22.5011338.800 3.7175 23.3081332.158 3.6991 9.7261281.868 3.5594 236.2111246.777 3.4620 9.7171234.477 3.4278 8.7591106.624 3.0728 235.0811074.832 2.9845 13.4221070.883 2.9736 13.3781040.474 2.8891 26.3381033.789 2.8706 50.4601026.992 2.8517 22.622932.644 2.5897 14.174920.731 2.5566 8.501693.444 1.9255 8.385677.749 1.8819 156.816664.377 1.8448 18.786461.026 1.2802 32.173______________________________________

IR(KBr, .nu..sub.max cm.sup.-1): 3450, 3300, 2930, 1720, 1638, 1560, 1515, 1478, 1450, 1330, 1065.

UV(MeOH, .nu..sub.max, nm): 368, 216.

EXAMPLE 13

7-[2-(2-Methoxyphenyldithio)ethylamino]-9a-methoxymitosane (56).--Method A applied to 2-methoxythiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.515 8.5705 103.5472778.944 7.7164 4.1682771.012 7.6944 4.0812670.705 7.4159 51.8502568.761 7.1328 2.9672561.119 7.1116 4.4692553.130 7.0894 4.2822538.673 7.0493 98.7372501.730 6.9467 3.0672494.323 6.9261 4.5032486.601 6.9047 1.9932434.187 6.7591 4.8652426.072 6.7366 4.2911892.531 5.2551 2.9521888.248 5.2432 2.9791882.191 5.2264 3.3501877.909 5.2145 3.2331769.650 4.9139 2.0761577.497 4.3803 4.4011564.771 4.3450 4.7741390.507 3.8611 2.8721386.070 3.8488 3.2491379.349 3.8301 3.0961375.131 3.8184 2.8051370.459 3.8054 1.7691363.138 3.7851 3.1471356.287 3.7661 5.3821349.565 3.7474 5.1721342.957 3.7291 2.2231289.212 3.5798 33.1371247.557 3.4642 3.0631235.150 3.4297 2.8661104.941 3.0681 37.4991074.634 2.9840 4.0351070.446 2.9724 4.1521034.998 2.8739 4.4811028.277 2.8553 7.8731021.667 2.8369 4.503933.058 2.5909 3.839715.577 1.9870 6.097682.593 1.8954 24.161______________________________________

IR(KBr, .nu..sub.max, cm.sup.-1): 3450, 3300, 2930, 1720, 1635, 1560, 1515, 1450, 1330, 1065.

UV(MeOH, .nu..sub.max, nm): 209, 214, 367.

EXAMPLE 14

7-[2-(2-Aminophenyldithio)ethylamino]-9a-methoxymitosane (62).--Method A applied to 2-aminothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.382 8.5701 86.7322671.205 7.4173 62.9832578.881 7.1609 3.3002572.379 7.1428 5.6632566.135 7.1255 3.4592538.819 7.0497 80.6091981.127 5.5011 3.5551891.642 5.2526 3.6011887.582 5.2413 3.8041881.369 5.2241 4.2951877.286 5.2128 4.0021787.037 4.9622 2.2151776.461 4.9328 3.2161765.421 4.9021 2.1131726.603 4.7943 5.7061580.362 4.3883 6.6411567.711 4.3531 7.1231396.170 3.8768 4.7611391.953 3.8651 5.3481385.027 3.8459 5.7511380.690 3.8338 5.4371377.505 3.8250 5.0331370.775 3.8063 8.7891364.034 3.7876 8.3291357.381 3.7691 3.4881244.058 3.4544 55.7421230.981 3.4181 3.3831104.203 3.0661 59.4681095.831 3.0428 2.0871074.561 2.9838 3.6471030.274 2.8608 7.3631023.508 2.8420 11.9921016.755 2.8233 6.322931.694 2.5871 4.183715.588 1.9870 34.595______________________________________

EXAMPLE 15

7-[2-(4-Aminophenyldithio)ethylamino]-9a-methoxymitosane (43).--Method A applied to 4-aminothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3097.058 8.5997 2.0743086.103 8.5693 63.4462682.029 7.4473 1.9282670.785 7.4161 42.2632654.773 7.3716 4.9572646.488 7.3486 4.9792549.849 7.0803 2.1252538.595 7.0490 61.7932510.432 6.9708 1.3302423.093 6.7283 4.2932414.889 6.7055 4.1332093.654 5.8135 4.1591902.189 5.2819 1.4101897.989 5.2702 1.5331891.815 5.2531 1.8011887.650 5.2415 1.7911788.714 4.9668 1.2281722.452 4.7828 1.9201711.799 4.7532 51.9571581.821 4.3923 2.5861569.146 4.3571 2.8531390.464 3.8609 1.6031386.294 3.8494 1.8121379.299 3.8299 1.8381375.107 3.8183 1.7641371.339 3.8078 1.1791364.417 3.7886 2.6201358.048 3.7709 2.9191351.641 3.7531 1.4321241.435 3.4471 1.1811228.989 3.4126 1.0761105.040 3.0684 1.7181100.481 3.0557 19.0331091.834 3.0317 1.0201086.003 3.0155 1.0501078.584 2.9949 1.2681056.956 2.9349 1.2821050.624 2.9173 2.0371046.337 2.9054 1.7541039.661 2.8869 2.3591032.701 2.8675 1.549930.333 2.5833 1.355723.295 2.0084 1.102698.719 1.9402 14.859689.544 1.9147 2.050558.101 1.5497 1.018461.045 1.2802 1.183-56.758 -.1576 35.127______________________________________

IR(KBr, .nu..sub.max cm.sup.-1): 3440, 3360, 3290, 2940, 1720, 1635, 1600, 1510, 1300, 1330.

UV(MeOH, .lambda..sub.max nm): 218, 369.

EXAMPLE 16

7-[2-(3-Aminophenyldithio)ethylamino]-9a-methoxymitosane (53).--Method A applied to 3-aminothiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.871 8.5715 374.9902691.699 7.4742 2.5042682.064 7.4474 6.1532670.593 7.4156 273.1312588.581 7.1878 2.2712571.392 7.1401 4.0982569.555 7.1350 6.1592559.811 7.1080 2.8052549.477 7.0793 7.5062538.555 7.0489 343.2062527.557 7.0184 10.5122463.709 6.8411 3.1092456.158 6.8201 4.6942408.230 6.6870 2.7052400.366 6.6652 2.4542398.758 6.6607 2.4712044.665 5.6775 3.7371895.598 5.2636 1.7601891.482 5.2522 1.8741885.412 5.2353 2.2691881.100 5.2233 2.0741730.133 4.8041 64.7901579.573 4.3861 3.8511566.945 4.3510 4.1311392.672 3.8671 2.4231388.477 3.8555 2.4391381.578 3.8363 2.4111377.292 3.8244 2.1381347.946 3.7429 1.6461340.937 3.7234 3.9081334.439 3.7054 4.1301327.335 3.6857 1.7811103.126 3.0631 32.5731072.236 2.9773 1.6921016.905 2.8237 4.0411010.123 2.8049 7.3291003.221 2.7857 3.777929.798 2.5818 1.966714.778 1.9848 1.619685.856 1.9044 16.898______________________________________

EXAMPLE 17

7-[2-(4-Hydroxyphenyldithio)ethylamino]-9a-methoxymitosane (42).--Method A applied to 4-hydroxythiophenol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTEGRAL INTENSITY______________________________________3136.440 8.7090 6.424 68.7012747.803 7.6299 1.242 15.1542739.247 7.6061 1.336 17.7302731.869 7.5856 .348 3.8232721.298 7.5563 5.725 46.4762598.368 7.2149 .269 2.5152589.146 7.1893 7.546 69.9142573.746 7.1466 .152 5.7632570.616 7.1379 1.138 17.9602562.036 7.1140 1.301 16.4931949.364 5.4128 .230 4.0491945.208 5.4013 .291 4.5991938.860 5.3837 .304 5.4031934.844 5.3725 .367 5.4441821.705 5.0584 1.429 3.9161810.519 5.0273 .516 3.9811776.864 4.9338 10.877 17.8111637.246 4.5462 .514 7.8551624.515 4.5108 .679 8.5971442.851 4.0064 .315 4.3391438.819 3.9952 .305 5.0981431.777 3.9756 .289 5.1091427.713 3.9644 .266 5.2191423.796 3.9535 .310 4.5581417.071 3.9348 .781 10.3711410.591 3.9168 .886 10.8941404.165 3.8990 .429 4.6411294.248 3.5938 2.282 32.7751285.005 3.5681 .744 5.3151154.198 3.2049 3.627 58.9651129.182 3.1354 .453 5.1151125.913 3.1263 .766 5.9421103.171 3.0632 .560 6.4111096.485 3.0446 .924 11.6531089.858 3.0262 .625 6.432982.320 2.7276 1.199 5.800765.778 2.1263 .369 3.738748.336 2.0779 3.529 45.305______________________________________

EXAMPLE 18

7-[2-(1-Phenylethylidithio)ethylamino]-9a-methoxymitosane (48).--Method A applied to 1-phenylethane thiol

.sup.1 H NMR data (partial, pyridine d.sub.5):

______________________________________FREQUENCY PPM INTEGRAL INTENSITY______________________________________1952.473 5.4215 .091 5.1041948.316 5.4100 .090 5.5131942.104 5.3927 .112 6.4181938.031 5.3814 .090 6.0331848.588 5.1331 .076 2.4411837.836 5.1032 .148 4.2391827.564 5.0747 .057 1.8811775.213 4.9293 .639 20.6161639.982 4.5538 .198 12.9171627.323 4.5187 .205 14.1961521.186 4.2239 .011 1.9131519.505 4.2193 .025 1.9501514.020 4.2040 .075 6.7851512.644 4.2002 .072 6.6061507.161 4.1850 .089 7.2001505.450 4.1803 .056 6.9451500.096 4.1654 .019 1.8561498.683 4.1615 .015 1.7411450.041 4.0264 .102 7.2681445.788 4.0146 .109 7.9751438.875 3.9954 .116 7.7961434.671 3.9837 .078 6.4151377.618 3.8253 .123 5.2781370.918 3.8067 .352 14.6141364.196 3.7880 .325 14.7741357.461 3.7693 .096 5.1201302.525 3.6168 .185 4.3691290.379 3.5831 .141 3.7871177.451 3.2695 .023 2.0081169.846 3.2484 .046 1.6161158.939 3.2181 1.461 127.7821139.148 3.1631 .080 2.9741135.997 3.1544 .072 3.9881132.619 3.1450 .089 3.9911128.305 3.1330 .083 3.545995.594 2.7645 .081 3.409990.478 2.7503 .319 4.937965.625 2.6813 .247 9.342958.849 2.6625 .447 17.679952.251 2.6442 .191 8.417771.751 2.1430 .117 3.407765.016 2.1243 .241 6.467755.207 2.0970 1.509 59.872596.118 1.6553 .398 31.993594.078 1.6496 .324 31.181588.980 1.6354 .301 33.173586.888 1.6296 .366 31.940______________________________________

IR(KBr, .nu..sub.max, cm.sup.-1): 3430, 3300, 2920, 1720, 1640, 1560, 1510, 1450, 1330, 1220, 1060.

UV(MeOH, .lambda..sub.max, nm): 369, 220.

EXAMPLE 19

7-[2-(4-Pyridylmethyldithio)ethylamino]-9a-methoxymitosane (64).--Method A applied to 4-pyridylmethane thiol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3174.124 8.8137 1.5593086.504 8.5704 275.6812997.042 8.3220 1.7552751.614 7.6405 1.6212670.799 7.4161 152.5172619.866 7.2747 2.2152594.341 7.2038 13.4492588.514 7.1877 13.8872549.316 7.0788 10.6852538.735 7.0494 237.9662491.394 6.9180 1.6712476.552 6.8768 1.6262455.604 6.8186 1.8791997.041 5.2676 3.8961892.600 5.2553 3.9331886.432 5.2331 4.1611882.279 5.2266 3.3821778.252 4.9378 2.9471720.692 4.7779 50.8991650.169 4.5821 1.7791582.212 4.3934 6.6851569.373 4.3578 7.3941508.983 4.1901 1.5691461.935 4.0594 1.6081414.766 3.9285 1.6171394.661 3.8726 4.3291390.442 3.8609 4.9621383.398 3.8413 4.9191379.350 3.8301 4.3761364.298 3.7883 31.0001340.407 3.7220 3.8341333.778 3.7036 8.3471327.039 3.6849 8.2131320.566 3.6669 4.2871292.880 3.5900 1.7631246.523 3.4613 3.1721233.880 3.4262 2.9581179.559 3.2753 2.3211103.699 3.0647 60.4861077.339 2.9915 3.363963.663 2.6897 6.328961.933 2.6710 11.830955.266 2.6525 6.534934.417 2.5946 3.978336.539 2.3229 4.536334.326 2.3167 5.550832.030 2.3105 4.390699.151 1.9414 29.860487.633 1.3540 1.511332.357 .9229 1.611______________________________________

IR(KBr, .nu..sub.max, cm.sup.=1): 3440, 3290, 1720, 1640, 1605, 1560, 1515, 1450, 1330, 1065.

EXAMPLE 20

7-[2-(4-Methyl-2-pyridylmethyldithio)ethylamino]-9a-methoxymitosane (63).--Method A applied to 4-methyl-2-pyridylmethane thiol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.419 8.5702 239.1873011.849 8.3631 21.4493007.220 8.3503 22.2562671.331 7.4176 174.7802602.023 7.2252 20.5962594.621 7.2046 23.9152572.270 7.1425 11.1402565.754 7.1245 20.4052559.391 7.1068 11.8612539.018 7.0502 214.1052497.280 6.9343 23.5242492.564 6.9212 22.5102489.765 6.9135 20.5832484.914 6.9000 18.9601831.844 5.2532 14.6611887.614 5.2414 15.5621881.465 5.2244 17.0291877.276 5.2127 16.8211776.235 4.9322 6.8741725.906 4.7924 10.7661582.344 4.3938 30.8181569.610 4.3584 31.9701390.446 3.8609 17.5011386.216 3.8492 18.4601379.317 3.8300 17.7561375.091 3.8183 15.8611351.761 3.7535 14.7721345.005 3.7347 37.8381338.331 3.7162 38.3021331.673 3.6977 14.9071245.659 3.4589 10.5231238.513 3.4390 8.7681235.373 3.4303 8.4551102.135 3.0604 263.8491090.832 3.0290 3.8481074.317 2.9831 12.0331030.168 2.8605 1.861979.513 2.7199 26.621972.717 2.7010 45.298966.020 2.6824 23.341951.597 2.6423 2.822932.901 2.5904 14.404831.018 2.3075 2.380814.241 2.2609 23.991807.604 2.2425 11.000790.332 2.1946 2.335768.225 2.1332 202.142750.042 2.0827 2.241738.922 2.0518 2.803693.260 1.9250 11.444______________________________________

EXAMPLE 21

7-[2-(4-Pyridyldithio)ethylamino]-9a-methoxymitosane (60).--Method A applied to 4-pyridine thiol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.649 8.5708 57.3233054.780 8.4824 1.6202671.319 7.4176 30.9342658.667 7.3824 2.3232653.425 7.3679 2.1512619.587 7.2739 .6402556.340 7.0997 2.4602539.166 7.0506 49.6651895.995 5.2647 .7791891.977 5.2535 .9541885.669 5.2360 1.1211881.501 5.2245 .9631790.914 4.9729 .6981779.668 4.9417 .8671769.467 4.9134 .6601719.407 4.7744 30.7631575.456 4.3746 1.4881562.781 4.3394 1.5671395.762 3.8757 1.2801391.530 3.8639 1.4781384.665 3.8449 1.4901380.365 3.8329 1.1491342.279 3.7272 1.4551335.741 3.7090 1.5051328.907 3.6900 .6521243.405 3.4526 1.2161230.856 3.4178 .6921108.243 3.0773 16.5291104.345 3.0665 3.0001080.133 2.9993 .8171043.465 2.8974 1.5601036.679 2.8786 2.5501030.071 2.8602 1.2881004.731 2.7899 .568934.708 2.5954 .885718.942 1.9963 1.440708.953 1.9686 .887676.425 1.8783 6.760______________________________________

IR(KBr, .nu..sub.max cm.sup.-1): 3440, 3290, 2920, 1720, 1635, 1560, 1510, 1465, 1330, 1065.

UV(MeOH, .nu..sub.max nm): 219, 240.7, 368.4.

EXAMPLE 22

7-[2-(3-Methyl-2-imidazolylmethyldithio)ethylamino]-9a-methoxymitosane (59).--Method A applied to 3-methyl-2-imidazolylmethane thiol

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.225 8.5697 122.1482670.664 7.4158 66.9412577.506 7.1571 2.0842570.864 7.1386 3.9852564.225 7.1202 2.6142538.717 7.0494 111.6902475.041 6.8726 12.5832474.081 6.8699 11.4171991.623 5.5302 7.5531894.038 5.2593 2.78321889.805 5.2475 2.9361883.545 5.2301 3.2921879.381 5.2186 3.1791773.734 4.9252 1.6161728.614 4.7999 40.3431581.458 4.3913 5.7711568.670 4.3558 6.6401475.622 4.0974 31.3321407.786 3.9091 2.3031390.174 3.8602 3.4041386.082 3.8488 3.8961378.969 3.8290 3.6131374.928 3.8178 3.1021336.207 3.7103 2.9491329.594 3.6919 7.7111322.960 3.6735 7.8601316.368 3.6552 2.8431243.997 3.4543 1.9891229.660 3.4145 5.6431220.716 3.3896 67.0941101.470 3.0585 53.3401073.712 2.9814 2.303963.590 2.6756 5.806956.921 2.6571 10.710950.380 2.6390 5.439931.156 2.5856 2.799836.039 2.3215 1.994833.802 2.3153 2.506831.678 2.3094 1.746732.551 2.0341 2.020703.377 1.9531 28.078______________________________________

IR(KBr, .nu..sub.max cm.sup.-1): 3440, 3290, 2930, 1715, 1635, 1560, 1505, 1456, 1330, 1065.

UV(MeOH, .lambda..sub.max nm): 221, 368, 570.

EXAMPLE 23

7-[2-(2-Amino-2-(ethoxycarbonyl)ethyldithio)ethylamino]-9a-methoxymitosane (40).--Method A applied to ethyl cysteinate

.sup.1 H NMR data (pyridine d.sub.5, .delta.): 1.16(t, 3H, J=8 Hz), 2.00(m, 1H), 2.08(s, 3H), 2.72(m, 1H), 3.00(m, 4H), 3.20(s, 3H), 3.56(bd, 1H, J=16 Hz), 3.72-4.12(m, 3H), 4.20(q, 2H, J=8 Hz), 4.52(d, 1H, J=16 Hz), 5.04(t, 1H, J=12 Hz), 5.36(dd, 1H, J=4, 12 Hz).

IR(KBr, .nu..sub.max cm.sup.-1): 3420, 3290, 2920, 1720, 1630, 1555, 1510, 1445, 1320, 1210, 1055.

UV(MeOH, .lambda..sub.max, nm): 220, 368.

EXAMPLE 24

7-[2-(2-Methoxycarbonyl)ethyldithio)ethylamino]-9a-methoxymitosane (32).--Method A applied to methyl 2-mercaptopropionate

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3036.621 8.5708 52.9852685.541 7.4571 .9642671.420 7.4178 22.0112566.711 7.1271 1.7042560.323 7.1094 3.7092553.894 7.0915 2.4682539.174 7.0506 48.2441892.097 5.2539 2.4371887.915 5.2423 2.4081881.776 5.2252 3.0201877.563 5.2135 2.7421789.180 4.9681 1.3291778.437 4.9383 2.2801767.395 4.9076 1.2511714.709 4.7613 7.0321580.911 4.3898 5.1081568.144 4.3543 5.4361545.206 4.2906 7.5211538.974 4.2733 15.9361532.490 4.2553 9.0981393.162 3.8685 3.1501388.980 3.8568 3.1811381.922 3.3372 3.4601377.845 3.8259 2.8621368.102 3.7989 2.7241361.449 3.7804 6.9261354.697 3.7616 7.2251347.991 3.7430 2.9581244.836 3.4566 5.6531232.775 3.4231 2.0301104.313 3.0664 44.3261073.331 2.9943 2.0821038.407 2.8834 9.4281031.986 2.3656 15.9201025.699 2.8481 14.1261018.715 2.8287 10.6791011.898 1.8098 5.869934.910 2.5960 2.371713.368 1.9808 25.764667.709 1.8541 65.234______________________________________

IR(KBr, .nu..sub.max cm.sup.-1): 3340, 3280, 2960, 1740, 1640, 1560, 1520, 1455, 1335, 1230, 1070.

UV(MeOH, .lambda..sub.max, nm): 368, 220.

EXAMPLE 25

7-[2-Dimethylaminoethyldithio)ethylamino]-9a-methoxymitosane (33).--Method A applied to 2-dimethylaminoethanethiol

.sup.1 H NMR data (pyridine d.sub.5 .delta.): 1.98(s, 9H), 2.00 (bs, 1H), 2.42(m, 2H), 2.58(bs, 1H), 2.75(m, 4H), 2.99(bs, 1H), 3.06(s, 3H), 3.45(bs, 1H), 3.85(m, 3H), 4.39(dd, 1H, J=4, 10 Hz), 4.70(m, 1H), 5.23(dd, 1H, J=4, 10 Hz), 7.16(t, 1H).

EXAMPLE 26

7-[2-(2-Carboxyphenyldithio)ethylamino]-9a-methoxymitosane (34).--Method B applied to 2-mercaptobenzoic acid

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3105.777 8.6240 1.0683095.623 8.5958 1.9953086.411 8.5702 81.4373071.395 8.5285 3.5873070.374 8.5257 3.7223063.973 8.5079 3.2073062.956 8.5051 3.2952971.028 8.2498 3.4222962.990 8.2275 3.6812689.885 7.4691 1.0382680.454 7.4429 1.5792670.359 7.4149 52.5222659.752 7.3855 3.0622651.257 7.3619 3.1932644.169 7.3422 1.8262569.382 7.1345 1.3722562.851 7.1164 4.3762555.595 7.0962 4.7212547.992 7.0751 3.4052583.284 7.0482 72.8981895.991 5.2647 1.8611891.918 5.2534 2.0991885.537 5.2357 2.4331881.409 5.2242 2.2631741.321 4.8352 6.0081574.703 4.3726 3.5321561.952 4.3371 3.9141394.094 3.8710 1.9951389.928 3.8595 2.2211383.040 3.8404 2.1211378.894 3.8288 1.9461334.928 3.7068 2.6011328.296 3.6883 2.7451244.108 3.4546 40.0351101.463 3.0585 29.4781066.231 2.9607 1.6521003.478 2.7864 2.733996.779 2.7678 5.468990.106 2.7493 2.776926.202 2.5718 1.893663.304 1.8418 20.960______________________________________

EXAMPLE 27

7-[2-(4-Nitro-3-carboxyphenyldithio)ethylamino]-9a-methoxymitosane (35).--Method B applied to 5-mercapto-2-nitrobenzoic acid

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3036.277 8.5698 570.7752943.307 3.1367 3.3272765.764 7.6798 5.7662757.565 7.6571 7.2102670.599 7.4156 284.3882533.303 7.0432 503.3041888.779 5.2447 4.8221884.614 5.2331 5.0071878.212 5.2153 5.8291874.120 5.2040 5.2661781.017 4.9454 6.8151770.174 4.9153 10.8911759.492 4.8857 7.7741733.376 4.8181 10.9731576.793 4.8784 7.3521564.168 4.3433 7.7671391.762 3.9646 6.3831387.619 3.8531 5.8941380.737 3.8340 6.4341376.590 3.8114 5.1321333.456 3.8224 6.5311329.266 3.6910 6.3281244.117 3.4546 8.5491232.499 3.4223 5.0611103.173 3.0632 77.7881062.837 2.9512 6.5161058.740 209899 6.8711013.064 2.8130 8.0541006.409 2.7945 14.156999.788 2.7762 6.715 -925.557 2.5700 6.602680.086 1.8884 48.400672.145 1.8664 8.733664.121 1.8441 155.478______________________________________

IR(KBr, .nu..sub.max, cm.sup.-1): 3440, 3280, 2930, 1605, 1620, 1640, 1560, 1510, 1455, 1340, 1065.

UV(H.sub.2 O, .lambda..sub.max nm): 220, 368.

EXAMPLE 28

7-[2-(2-Amino-2-carboxyethyldithio)ethylamino]-9a-methoxymitosane (36).--Method B is applied to cysteine.

.sup.1 H NMR data (D.sub.2 O):

______________________________________FREQUENCY PPM INTENSITY______________________________________1649.415 4.5800 3.1081645.021 4.5678 3.5521638.887 4.5508 4.0851634.273 4.5379 3.6641525.901 4.2370 2.3081515.309 4.2076 4.2401502.937 4.1733 4.0741489.072 4.1348 3.5151462.182 4.0601 5.4781458.281 4.0493 6.8651453.746 4.0367 11.8481447.340 4.0189 12.5141440.997 4.0013 6.5911312.694 3.6450 5.5671308.251 3.6327 7.6861302.226 3.6159 6.5191297.608 3.6031 5.7241196.176 3.3215 27.5501192.345 3.3108 4.9241181.395 3.2804 6.4971177.423 3.2694 6.9491168.542 3.2447 63.5941119.788 3.1094 6.2751111.126 3.0853 6.8671104.602 3.0672 5.8141096.139 3.0437 9.4011089.039 3.0240 9.4951083.236 3.0079 7.3981078.825 2.9956 10.0341072.130 2.9770 5.6381064.763 2.9566 3.050710.980 1.9742 52.332-13.126 -.0364 37.147______________________________________

IR(KBr, .nu..sub.max, cm.sup.-1): 3440, 3030, 2930, 1720, 1635, 1545, 1495, 1455, 1340, 1065.

UV(H.sub.2 O, .lambda..sub.max nm): 221, 286, 369.

EXAMPLE 29

7-[2-(.delta.-Glutamylamino)-2-(carboxymethylaminocarbonyl)ethyldithio)ethylamino]-9a-methoxymitosane (37).--Method B is applied to glutathione

.sup.1 H NMR data (D.sub.2 O):

______________________________________FREQUENCY PPM INTENSITY______________________________________1689.759 4.6920 2.0401685.239 4.6795 1.7771643.159 4.5626 3.8921639.038 4.5512 4.2141632.588 4.5333 4.7361628.077 4.5207 3.3021522.085 4.2264 4.1681511.609 4.1973 3.4901500.800 4.1673 11.2621487.527 4.1305 8.5441434.871 3.9843 6.3121429.119 3.9683 11.9421423.005 3.9513 6.0951360.220 3.7770 2.2241342.556 3.7279 15.7311337.863 3.7149 15.6041320.595 3.6669 2.9751307.367 3.6302 9.3771297.536 3.6029 5.6961293.109 3.5906 8.5311248.183 3.4659 1.8201222.128 3.3935 4.7771192.165 3.3103 1.5591165.228 3.2355 64.2951149.618 3.1922 5.4021145.417 3.1805 5.2241083.362 3.0082 9.8001070.734 2.9731 11.2741065.367 2.9582 11.0631060.328 2.9443 7.5671055.097 2.9297 7.8721041.201 2.8911 4.945905.486 2.5143 6.203897.491 2.4921 10.938890.187 2.4718 7.881763.565 2.1202 8.676756.686 2.1011 8.464702.759 1.9514 46.428675.381 1.8754 3.776614.279 1.7057 7.124-16.375 -.0455 71.146______________________________________

EXAMPLE 30

7-[2-(2-Amino-2-((1-carboxy-3-methyl-1-butyl)aminocarbonyl)ethyldithio)ethylamino]-9a-methoxymitosane (38).--Method B is applied to L-cysteinyl(-L-)leucine

.sup.1 H NMR data (D.sub.2 O):

______________________________________FREQUENCY PPM INTENSITY______________________________________1651.506 4.5858 2.9241647.060 4.5734 3.1721640.615 4.5555 3.5301635.941 4.5426 3.1651534.085 4.2597 2.3201526.032 4.2374 3.9961515.102 4.2070 8.6681509.929 4.1927 7.3121502.857 4.1730 7.1991488.866 4.1342 4.8381448.667 4.0226 3.8161442.515 4.0055 7.0901436.264 3.9881 4.7731310.487 3.6389 5.8311296.868 3.6011 5.2431227.979 3.4098 2.9821209.376 3.3581 3.5561204.976 3.3459 3.3581197.754 3.3258 20.1611196.599 3.3226 19.8171190.217 3.3049 4.0001178.748 3.2731 2.3711171.258 3.2523 28.6541170.198 3.2493 25.8271147.478 3.1862 2.3281140.928 3.1681 2,3001112.099 3.0880 3.4401104.789 3.0677 3.8801090.655 3.0285 10.6251084.782 3.0121 7.076964.867 2.6792 2.187708.722 1.9679 21.305688.172 1.9109 2.286682.736 1.8958 2.129585.757 1.6265 4.378577.064 1.6024 9.258571.316 1.5864 10.734552.828 1.5351 2.644326.817 .9075 13.468321.984 .8941 19.288313.339 .8701 14.706

EXAMPLE 31

7-[2-(2-Carboxyethyldithio)ethylamino]-9a-methoxymitosane (49).--Method B applied to 2-mercaptopropionic acid

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3173.918 8.8132 1.4823107.623 8.6291 1.703098.097 8.6026 2.9623086.067 8.5692 245.5562996.455 8.3204 1.7002750.459 7.6373 1.8822691.271 7.4730 2.0462682,509 7.4487 3.0992670.109 7.4142 179.8602618.587 7.2712 1.6912597.614 7.2129 2.0792591.598 7.1962 3.8792559.664 7.1075 1.9522550.756 7.0828 3.2492538.040 7.0475 223.1782455.884 6.8194 1.5641879.133 5.2179 2.4861874.974 5.2063 2.7321868.493 5.1883 3.0571864.431 5.1771 2.9161757.132 4.8791 2.3961746.322 4.8491 4.4931724.357 4.7881 12.7481578.370 4.3827 5.3601565.635 4.3474 5.8781383.183 3.8408 3.5581379.027 3.8292 3.8161372.105 3.8100 5.4161365.216 3.7909 6.1231358.754 3.7729 5.9741352.431 3.7554 2.6091244.376 3.4553 3.4401232.982 3.4237 2.7661154.455 3.2056 3.1981150.466 3.1946 3.9351147.759 3.1870 4.1171143.257 3.1745 8.2521136.033 3.1545 5.2351102.572 3.0616 41.9211059.477 2.9419 3.7001030.728 2.8621 4.9721024.210 2.8440 8.5201016.050 2.8213 6.9681008.250 2.7997 7.9481000.938 2.7794 3.981930.084 2.5826 3.740747.720 2.0762 1.353706.055 1.9605 30.939663.989 1.8437 86.533______________________________________

EXAMPLE 32

7-[2-(4-Nitrophenyldithio)ethylamino]-9a-methoxy-1a-methylmitosane (41)

To a solution of 1a-methyl mitomycin A (98 mg, 0.28 mM (L. Cheng et al., J. Med. Chem. 20, 767 (1977)) in deoxygenated methanol (5 ml) was added at 0 deg. C. and under an argon atmosphere, p-nitrophenyldithioethylamine hydrochloride (81 mg) followed by addition of triethylamine (70 ul). The reaction mixture was allowed to warm up to room temperature and after 3.5 hrs. the reaction was almost complete as evidenced by thin layer chromatography (silica gel, 5% v/v MeOH in CH.sub.2 Cl.sub.2). The reaction mixture was concentrated under reduced pressure and the resulting residue chromatographed twice on silica gel using 5% v/v MeON in CH.sub.2 Cl.sub.2 to obtain the title compound pure, as a blue amorphous solid (68 mg, 43%).

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.194 8.5696 7.3272909.668 8.0794 2.6972906.985 8.0720 15.6772900.119 8.0529 6.6442898.157 8.0474 19.4062728.645 7.5767 3.4232726.000 7.5694 19.6072724.024 7.5639 6.4192717.205 7.5450 17.5712714.433 7.5373 2.8112670.880 7.4163 3.9342592.925 7.1999 1.3632573.965 7.1472 2.3962567.475 7.1292 4.6782560.978 7.1112 2.4142538.815 7.0496 7.4651989.189 5.5235 17.2481869.362 5.1907 5.0281865.031 5.1787 5.1341859.039 5.1621 5.8651854.684 5.1500 5.4421713.379 4.7576 27.4821676.655 4.6556 5.4911665.804 4.6255 6.9421654.740 4.5948 4.7811546.359 4.2938 8.6761533.366 4.2578 9.5861378.895 3.8288 4.7031374.570 3.8168 5.1751367.615 3.7975 5.0901363.257 3.7854 4.8101360.238 3.7770 3.1271353.560 3.7585 7.7481346.877 3.7399 8.0541340.210 3.7214 3.0841217.740 3.3814 5.3831215.699 3.3757 5.7341204.960 3.3459 4.9051203.034 3.3405 4.5761108.963 3.0793 2.6131096.620 3.0450 64.2711063.680 2.9536 7.4561056.979 2.9350 14.7261050.296 2.9164 7.013858.399 2.3836 9.631853.826 2.3709 10.974758.850 2.1071 2.474753.017 2.0909 54.711738.462 2.0505 1.558723.515 2.0090 6.130721.571 2.0036 6.123719.009 1.9965 5.626717.087 1.9912 5.387675.259 1.8750 51.667531.663 1.4763 1.41737.518 .1042 2.929-57.316 -.1592 119.809-59.990 -.1666 6.098______________________________________

IR(KBr, .nu..sub.max, cm.sup.-1): 3460, 3300, 2950, 1755, 1640, 1560, 1515, 1455, 1430, 1415, 1330, 1225, 1060.

UV(MeOH, .lambda..sub.max, nm): 369 and 220.

EXAMPLE 33

7-[2-(3-Nitro-2-pyridyldithio)propylamino]-9a-methoxymitosane (44)

To a solution of 7-dimethylaminomethyleneamino-9a-methoxymitosane (744 mg, 1.91 mM) in deoxygenated methanol (12 ml) at about 0 deg. C. were added sequentially under stirring, 3-(4-nitro-phenyldithio)propylamine hydrochloride (1.55 g), prepared in the manor described in Ser. No. 581,291 from 3-mercaptopropylamine and employing the deBrois procedure using methoxycarbonylsulfenyl chloride, and triethylamine (774 ul). The reaction mixture was sonicated and allowed to stand at room temperature for 16 hours. Thin layer chromatography (silica gel, 10% MeOH in CH.sub.2 Cl.sub.2) revealed that a major faster blue component had been formed in addition to the presence of traces of starting material (green) and mitomycin C. The reaction mixture was concentrated under reduced pressure and the resulting residue was chromatograhed twice over silica gel using 5-10% v/v MeOH in CH.sub.2 Cl.sub.2 to obtain the title compound as the faster blue component, isolated as an amorphous blue solid.

.sup.1 H NMR data (pyridine d.sub.5,)

______________________________________FREQUENCY PPM INTENSITY______________________________________3146.622 8.7374 10.6563145.334 8.7338 12.1533142.191 8.7251 12.5583140.880 8.7214 12.8683098.074 8.6026 12.9883086.605 8.5707 368.7543007.372 8.3507 10.6092998.735 8.3267 11.6232997.529 8.3234 13.0042751.247 7.6395 2.9912682.257 7.4480 8.3582670.888 7.4164 158.6352619.438 7.2735 3.4862589.946 7.1916 15.5592585.500 7.1793 13.7432581.808 7.1690 13.8272577.322 7.1566 11.8182550.648 7.0825 13.3082538.876 7.0498 342.6552489.224 6.9119 7.2692456.328 6.8206 2.691879.962 5.2202 6.1521875.717 5.2084 6.1561869.761 5.1919 7.3411865.544 5.1801 6.8721783.865 4.9533 5.0261773.046 4.9233 8.1911762.088 4.8929 6.2401726.635 4.7944 152.0851587.007 4.4067 13.6591574.363 4.3716 14.2311386.003 3.8486 8.0391381.797 3.8369 8.8771374.826 3.8175 8.2851370.733 3.8062 7.3841295.122 3.5962 6.3111290.268 3.5828 13.3741283.643 3.5644 13.8451276.626 3.5449 6.6111247.654 3.4644 7.1551234.232 3.4272 6.3231174.396 3.2610 2.1081114.136 3.0937 3.0071103.806 3.0650 119.7001095.938 3.0431 4.2991078.188 2.9939 6.6411050.017 2.9156 15.7551042.930 2.8960 30.4691036.059 2.8769 16.193934.212 2.5941 6.742713.529 1.9813 58.234685.209 1.9027 5.453678.187 1.8832 14.115671.329 1.8641 19.760664.370 1.8448 13.086657.421 1.8255 4.108402.644 1.1180 1.812242.843 .6743 2.244235.548 .6541 1.981______________________________________

EXAMPLE 34

7-[2-(4-Nitrophenyldithio)propylamino]-9a-methoxymitosane (45)

The title compound was prepared according to Method A using Compound No. 33 and 4-nitrothiophenol as reactants.

.sup.1 H NMR data (pyridine d.sub.5):

______________________________________FREQUENCY PPM INTENSITY______________________________________3086.648 8.5708 46.7002904.541 8.0651 3.1922895.707 8.0406 3.3552725.964 7.5693 3.9672717.144 7.5448 3.7202670.822 7.4162 19.7992538.767 7.0495 43.3572495.434 6.9292 .9241879.667 5.2193 .9491875.487 5.2077 .8801778.272 4.9378 .9071725.693 4.7918 11.8561588.217 4.4101 1.7021575.419 4.3745 1.8021391.549 3.8640 .9491387.471 3.8526 1.0121380.402 3.8330 .9941262.702 3.5062 .9361256.047 3.4877 2.1701249.302 3.4690 2.7341242.686 3.4506 1.1291236.092 3.4323 .8261104.391 3.0666 12.996986.877 2.7403 1.868979.734 2.7205 2.943972.546 2.7005 1.812937.074 2.6020 .832717.038 1.9910 .829697.821 1.9377 7.913665.479 1.8479 1.475658.432 1.8283 1.961651.446 1.8089 1.380______________________________________

The results of antitumor evaluation of the above substances is summarized in the table which follows. The test data involves two experimental animal tumors, P-388 leukemia in mice and B16 melanoma in mice. In addition, the present substances were tested for cytotoxic activity in vitro.

The in vitro cytotoxicity assay involved growing various mammalian tumor cells, including human tumor cells, on microtitre plates employing established tissue culture methods. The concentration of each compound required to inhibit cell growth by 50% (IC.sub.50) was then determined by a four-fold serial dilution technique. The validity of the method has been supported by a report published in the "Proceedings of the American Association for Cancer Research", Vol. 25, 328, p. 1391 (1984). Tumor cells of one or more of the following types were employed for each compound tested: B16-F10 murine melanoma; C26 murine colon; Moser human colon; M109 murine lung; and RCA human colon. A wide range of IC.sub.50 values was observed, but quantitative comparisons on the basis of these values were not made. The lowest IC.sub.50 value, 0.66 mcg/ml, was observed with Compound 26341 against the B16-F10 murine melanoma. In that system mitomycin C exhibits IC.sub.50 values in the range of 3-30 mcg/ml. Each of the claimed compounds was shown to be active (IC.sub.50 <500 mcg/ml).

P-388 Murine Leukemia

The test protocol involved CDF.sub.1 female mice implanted intraperitoneally with a tumor inoculum of 10.sup.6 ascites cells of P-388 murine leukemia and treated with various doses of a test compound, or with mitomycin C. The compounds were administered by intraperitoneal injection. Groups of six mice were used for each dosage amount and they were treated with a single dose of the compound on the day of inoculation. A group of ten saline treated control mice was included in each series of experiments. The mitomycin C treated groups were included as a positive control. A 30 day protocol was employed with the mean survival time in days being determined for each group of mice and the number of survivors at the end of the 30 day period being noted. The mice were weighed before treatment and again on day six. The change in weight was taken as a measure of drug toxicity. Mice weighing 20 grams each were employed and a loss in weight of up to approximately 2 grams was not considered excessive. The results were determined in terms of % T/C which is the ratio of the mean survival time of the treated group to the mean survival time of the saline treated control group times 100. The saline treated control animals usually died within nine days. The "maximum effect" in the table is expressed as % T/C and the dose giving that effect is reported. The values in parenthesis are the values obtained with mitomycin C as the positive control in the same experiment. Thus a measure of the relative activity of the present substances to mitomycin C can be estimated. A minimum effect in terms of % T/C was considered to be 125. The minimum effective dose reported in the following table is that dose giving a % T/C of approximately 125. The two values given in each instance in the "average weight change" column are respectively the average weight change per mouse at the maximum effective dose and at the minimum effective dose.

B16 Melanoma

BDF.sub.1 mice were employed in the B16 melanoma test. They were inoculated subcutaneously with the tumor implant. A 60 day protocol was used. Groups of ten mice were used for each dosage amount tested and the mean survival time for each group was determined. For each dosage level, the test animals were treated with the test compound on days 1, 5, and 9 by the intravenous route. Control animals which had been inoculated in the same way as test animals and treated with the injection vehicle only containing no drug exhibited a mean survival time of 18.5 to 26 days. The survival time relative to that of the controls (% T/C) was used as a measure of effectiveness. A % T/C value of 140 or greater was considered significant tumor inhibition. The value shown in parenthesis is the % T/C for mitomycin C in the same experiment. Several of the compounds show antitumor effectiveness clearly superior to that of mitomycin C. Examples demonstrating the biggest difference in ratio of activity (% T/C compound/% T/C mitomycin C) are Compound Nos. 43, 56, and 60.

In view of the antitumor activity observed in experimental animal tumors, and the lack of undue toxicity as compared to mitomycin C, the invention includes use of the substances of the present invention for inhibiting mammalian tumors. For this purpose they are administered systematically to a mammal bearing a tumor in substantially non-toxic antitumor effective dose.

The compounds of the present invention are intended primarily for use by injection in much the same way and for some of the same purposes as mitomycin C. Somewhat larger or smaller doses may be employed depending upon the particular tumor sensitivity. They are readily distributed as dry pharmaceutical compositions containing diluents, buffers, stabilizers, solubilizers, and ingredients contributing to pharmaceutical elegance. These compositions are then constituted with an injectable liquid medium extemporaneously just prior to use. Suitable injectable liquids include water, isotonic saline, etc.

__________________________________________________________________________Antitumor Activity of Compounds of Formula IX(Alk.sub.2 is CH.sub.2 CH.sub.2, and R is H) B16 Melanoma P-388 Murine Leukemia Optimal Effect MinimumCompound Example (mouse i.v.) Maximum Effect Effect AverageNo. (BMY) Number R.sup.9 Dose % T/C* Dose* % T/C* Dose Wt.__________________________________________________________________________ Change32(26341) 24 CH.sub.3 CO.sub.2 CH.sub.2 CH.sub.2 6.4(3.2) >333(>333) <0.2 +0.3, +1.633(26881) 25 (CH.sub.3).sub.2 NCH.sub.2 CH.sub.2 12.8(4.8) 167(172) 6.4 -1.2, -0.234(26678) 26 ##STR4## 3.2(4.8) 150(195) 0.2 +0.5, +0.335(26712) 27 ##STR5## 6.4 147(124) 12.8(3.2) 322(233) 0.8 -0.6, +0.836(26711) 28 ##STR6## 6.4 163(124) 12.8(3.2) 306(233) 0.4 -1.8, +0.737(26733) 29 ##STR7## 9.6 179(142) 12.8(4.8) 144(239) 6.4 -0.1, +0.538(26880) 30 ##STR8## 6.4(4.8) 167(172) 0.8 +0.7, +1.139(26187) 1 ##STR9## 25.6(4.8) 233(233) <0.2 -1.9, +0.640(26190) 23 ##STR10## 25.6(4.8) 283(233) <0.2 -0.9, +1.541(26339) 32 ##STR11## 3.2(3.2) 167(>333) 1.6 +1.2, +1.8 (R is methyl)42(26340) 17 ##STR12## 3.2 148(112) 12.8(3.2) >333(>333) <0.2 -1.7, +1.743(26107) 15 ##STR13## 3.2 188(112) 211(145) 12.8(4.8) >333(>333) <0.2 -4.5, +1.744(26495) 33 ##STR14## 12,8(4.8) 200(275) 0.8 -1.2, +1.2 (Alk.sub.2 is CH.sub.2 CH.sub.2 CH.sub.2 -)45(26496) 34 ##STR15## 25.6(4.8) 200(275) 1.6 0, +0.3 (Alk.sub.2 is CH.sub.2 CH.sub.2 CH.sub.2 )46(26646) 3 ##STR16## 2.4 206(153) 12.8(4.8) 186(195) 0.4 -0.3, +0.747(26650) 2 ##STR17## 12.8(4.8) 182(195) 1.6 -0.4, +1.348(26112) 18 ##STR18## 3.2(4.8) 167(>333) <0.2 -2.0, +1.249(26679) 31 NaO.sub.2 CCH.sub.2 CH.sub.2 12.8(4.8) 191(195) 0.4 =0.8, +0.550(26681) 7 ##STR19## 6.4(4.8) 173(195) 0.4 -0.4, +0.551(26682) 11 ##STR20## 6.4(4.8) 182(195) 0.8 +0.3, -0.152(26683) 6 ##STR21## 12.8(4.8) 168(195) 1.6 -0.8, +0.953(26702) 16 ##STR22## 12.8(4.8) 105(195) -- +1.0 --54(26708) 12 ##STR23## 1.6 216(149) 12.8(4.8) 222(233) 0.8 -0.3, +0.955(26709) 4 ##STR24## 12.8(4.8) 183(233) 0.8 -0.2, +0.856(26713) 13 ##STR25## 1.6 251(149) 12.8(3.2) 250(233) 0.4 -2.9, +0.957(26715) 9 ##STR26## 4.8 209(153) 12.8(3.2) 194(233) 0.2 -0.7, +1.458(26716) 8 ##STR27## 6.4 209(153) 12.8(3.2) 211(233) 0.1 -0.2, +1.359(26723) 22 ##STR28## 4.8 4.8 226(179) 187(142) 12.8(4.8) 322(239) 6.4 -2.0, -0.860(26731) 21 ##STR29## 9.6 251(149) 12.8(4.8) 256(239) 3.2 -1.9, +0.261 (26732) 10 ##STR30## 12.8(4.8) 150(239) 3.2 -1.3, +3.262(26857) 14 ##STR31## 12.8(4.8) 139(239) 12.8 +0.6, +0.663(26858) 20 ##STR32## 6.4(4.8) 144(239) 1.6 -1.7, +0.564(26861) 19 ##STR33## 3.2 173(149) 6.4(4.8) 183(239) 1.6 -2.1, +0.865(26879) 5 ##STR34## 3.2(4.8) 178(172) 0.8 +0.4,__________________________________________________________________________ +0.5

Claims

1. A compound selected from the group consisting of Compounds Nos. ( 32)-(65) identified as follows:

(32) 7-[2-(2-(Methoxycarbonyl)ethyldithio)ethylamino]-9a-methoxymitosane

(33) 7-[2-(2-Dimethylaminoethyldithio)ethylamino]-9a-methoxymitosane

(34) 7-[2-82-Carboxyphenyldithio)ethylamino]-9a-methoxymitosane

(35) 7-[2-(4-Nitro-3-carboxyphenyldithio)ethylamino]-9a-methoxymitosane

(36) 7-[2-(2-Amino-2-carboxyethyldithio)ethylamino]-9a-methoxymitosane

(37) 7-([2-(.delta.-Glutamylamino)-2-(carboxymethylaminocarbonylethyldithio)ethylamino]-9a-methoxymitosane

(38) 7-[2-Amino-2-((1-carboxy-3-methyl-1-butyl)aminocarbonyl)ethyldithio)ethylamino]-9a-methoxymitosane

(39) 7-[2-(4-Chlorophenyldithio)ethylamino]-9a-methoxymitosane

(40) 7-[2-(2-Amino-2-(ethoxycarbonyl)ethyldithio)ethylamino]-9a-methoxymitosane

(41) 7-[2-(4-Nitrophenyldithio)ethylamino]-9-a-methyloxy-1a-methylmitosane

(42) 7-[2-(4-Hydroxyphenyldithio)ethylamino]-9a-methoxymitosane

(43) 7-[2-Aminophenyldithio)ethylamino]-9a-methoxymitosane

(44) 7-[3-(3-Nitro-3-pyridyldithio)propylamino]-9a-methoxymitosane

(45) 7-[3-(4-Nitrophenyldithio)propylamino]-9a-methoxymitosane

(46) 4-[2-(4-Fluorophenyldithio)ethylamino]-9a-methoxymitosane

(47) 7-[2-(4-Bromophenyldithio)ethylamino]-9a-methoxymitosane

(48) 7-[2-(1-Phenylethyldithio)ethylamino]-9a-methoxymitosane

(49) 7-[2-(2-Carboxyethyldithio)ethylamino]-9a-methoxymitosane

(50) 7-[2-(2,4-Dichlorophenyldithio)ethylamino]-9a-methoxymitosane

(51) 7-[2-(3-Trifluoromethylphenyldithio)ethylamino]-9a-methoxymitosane

(52) 7-[2-(2,6-Dichlorophenyldithio)ethylamino]-9a-methoxymitosane

(53) 7-[2-(3-Aminophenyldithio)ethylamino]-9a-methoxymitosane

(54) 7-[2-(3-Methoxyphenyldithio)ethylamino]-9a-methoxymitosane

(55) 7-[2-(2-Chlorophenyldithio)ethylamino]-9a-methoxymitosane

(56) 7-[2-(2-Methoxyphenyldithio)ethylamino]-9a-methoxymitosane

(57) 7-[2-(2,5-Dichlorophenyldithio)ethylamino]9a-methoxymitosane

(58) 7-[2-(3-Chlorophenyldithio)ethylamino]-9a-methoxymitosane

(59) 7-[2-(3-Methyl-2-imidazolylmethyldithio)ethylamino]-9a-methoxymitosane

(60) 7-[2-(4-Pyridyldithio)ethylamino]-9a-methoxymitosane

(61) 7-[2-(3,4-Dichlorophenyldithio)ethylamino]-9a-methoxymitosane

(62) 7-[2-(2-Aminophenyldithio)ethylamino]-9a-methoxymitosane

(63) 7-[2-(4-Methyl-2-pyridylmethyldithio)ethylamino]-9a-methoxymitosane

(64) 7-[2-(4-Pyridylmethyldithio)ethylamino]-9a-methoxymitosane

(65) 7-[2-(2-Bromophenyldithio)ethylamino]-9a-methoxymitosane.

2. The compound of claim 1 identified as Compound No. 32.

3. The compound of claim 1 identified as Compound No. 33.

4. The compound of claim 1 identified as Compound No. 34.

5. The compound of claim 1 identified as Compound No. 35.

6. The compound of claim 1 identified as Compound No. 36.

7. The compound of claim 1 identified as Compound No. 37.

8. The compound of claim 1 identified as Compound No. 38.

9. The compound of claim 1 identified as Compound No. 39.

10. The compound of claim 1 identified as Compound No. 40.

11. The compound of claim 1 identified as Compound No. 41.

12. The compound of claim 1 identified as Compound No. 42.

13. The compound of claim 1 identified as Compound No. 43.

14. The compound of claim 1 identified as Compound No. 44.

15. The compound of claim 1 identified as Compound No. 45.

16. The compound of claim 1 identified as Compound No. 46.

17. The compound of claim 1 identified as Compound No. 47.

18. The compound of claim 1 identified as Compound No. 48.

19. The compound of claim 1 identified as Compound No. 49.

20. The compound of claim 1 identified as Compound No. 50.

21. The compound of claim 1 identified as Compound No. 51.

22. The compound of claim 1 identified as Compound No. 52.

23. The compound of claim 1 identified as Compound No. 53.

24. The compound of claim 1 identified as Compound No. 54.

25. The compound of claim 1 identified as Compound No. 55.

26. The compound of claim 1 identified as Compound No. 56.

27. The compound of claim 1 identified as Compound No. 57.

28. The compound of claim 1 identified as Compound No. 58.

29. The compound of claim 1 identified as Compound No. 59.

30. The compound of claim 1 identified as Compound No. 60.

31. The compound of claim 1 identified as Compound No. 61.

32. The compound of claim 1 identified as Compound No. 62.

33. The compound of claim 1 identified as Compound No. 63.

34. The compound of claim 1 identified as Compound No. 64.

35. The compound of claim 1 identified as Compound No. 65.

36. The pharmaceutically acceptable metal or amine salts of a compound of claim 1 selected from Compound Nos. 34, 35, 36, 37, and 38.

37. The sodium salt of a compound of claim 1 selected from Compound Nos. 34, 35, 36, 37, and 38.

38. The pharmaceutically acceptable acid addition salts of a Compound of claim 1 selected from Compound Nos. 33, 36, 37, 38, 40, 43, 53, 60, 62, 63, and 64.