EP0596010A1 - New derivatives of taxol analogues, preparation thereof and compositions containing them - Google Patents

Abstract

New derivatives of taxol analogs of general formula (I), their preparation and the compositions which contain them. In formula (I): Ar represents an aryl radical, R represents a radical of general formula (II): R7O- in which R7 represents an optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, bicycloalkyl, phenyl or heterocyclyl radical, R1 and R2, identical or different, represent a hydrogen atom or a radical of general formula (III) in which R3 and R4, identical or different, represent hydrogen or alkyl (optionally substituted by hydroxy, carboxy, alkyloxycarbonyl or a radical of formula (IV) in which R5 and R6, identical or different, represent hydrogen or alkyl or together form a saturated or unsaturated 5 or 6 membered heterocycle) or else R3 and R4 form a saturated or unsaturated 5 or 6 membered heterocycle . The new products of formula (I) exhibit remarkable antitumor and antileukemic properties.

Description

 NEW DERIVATIVES OF TAXOL ANALOGS.

 THEIR PREPARATION AND COMPOSITIONS

YES CONTAIN THEM

The present invention relates to new derivatives of taxol analogs of general formula:

their preparation and the compositions containing them.

 In the general formula (I),

 Ar represents an aryl radical,

R represents

 - a radical of general formula:

R ₇ O- (II)

in which R ₇ represents a straight or branched alkyl radical containing 1 to 8 carbon atoms, alkenyl containing 2 to 8 carbon atoms, alkynyl containing 3 to 8 carbon atoms, cycloalkyl containing 3 to 6 carbon atoms, cycloalkenyl containing 4 to 6 carbon atoms or bicycloalkyl containing 7 to 10 carbon atoms, these radicals being optionally substituted by one or more substituents chosen from halogen atoms and hydroxy, alkoxy radicals containing 1 to

4 carbon atoms, dialkoylamino, each alkyl part of which contains 1 to 4 carbon atoms, piperidino, morpholino, piperazinyl-1 (optionally substituted at-4 by an alkyl radical containing 1 to 4 carbon atoms or by a phenylalkyl radical, the part of which alkyl contains 1 to 4 carbon atoms), cycloalkyl containing 3 to 6 carbon atoms, cycloalkenyl containing 4 to 6 carbon atoms, phenyl, cyano, carboxy or alkyloxycarbonyl, the alkyl part of which contains 1 to 4 carbon atoms, - or a phenyl radical optionally substituted by one or more atoms or radicals chosen from halogen atoms and alkyl radicals containing 1 to 4 carbon atoms or alkyloxy containing 1 to 4 carbon atoms,

 - or a saturated or unsaturated nitrogen heterocyclyl radical containing 4 or 6 members and optionally substituted by one or more alkyl radicals containing 1 to 4 carbon atoms,

 it being understood that the cycloalkyl, cycloalkenyl or bicycloalkyl radicals may be optionally substituted by one or more alkyl radicals containing 1 to 4 carbon atoms,

R ₁ and R ₂ , identical or different, represent a hydrogen atom or a radical of general formula: (m)

in which R ₃ and R ₄ , identical or different, represent a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms in an optionally substituted straight or branched chain:

a) by a hydroxy, carboxy or alkyloxycarbonyl radical, the alkyl part of which contains 1 to 4 carbon atoms and is optionally substituted by a phenyl radical, b) by a radical of general formula: (IV)

in which R ₅ and R ₆ , identical or different, represent a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms in a straight or branched chain, or else R5 and R ^ form together with the nitrogen atom to which they are linked a saturated or unsaturated 5 or 6-membered heterocycle optionally containing a second heteroatom chosen from nitrogen atoms (optionally substituted by an alkyl radical containing 1 to 4 carbon or benzyl atoms), oxygen or sulfur, or else R ₃ and R ₄ form together with the nitrogen atom to which they are linked a saturated or unsaturated 5 or 6-membered heterocycle optionally containing a second heteroatom chosen from nitrogen atoms (optionally substituted by a alkyl radical containing 1 to 4 carbon or benzyl atoms), oxygen or sulfur, it being understood that at least one of the symbols R ₁ or R ₂ represents a radical of general formula (III).

 Preferably Ar represents a phenyl or α- or β-naphthyl radical optionally substituted by one or more atoms or radicals chosen from halogen atoms (fluorine, chlorine, bromine, iodine) and alkyl, alkenyl, alkynyl, aryl radicals, arylalkyls, alkoxy, alcoylthio, aryloxy, arylthio, hydroxy, hydroxyalkyl, mercapto, formyl, acyl, acylamino, aroylamino, alkoxycarbonylamino, amino, alkylamino, dialkylamino, carboxy, alkoxycarbonyl, carbamoyl, carbamoyl, dialcoylcarbyl, carboxyloyl, carboxyloyl, carboxyloyl, carboxyloyl, carboxyloyl, carboxyloyl, carboxyloyl, carboxyloyl, carboyloyl) that the alkyl radicals and the alkyl portions of the other radicals contain 1 to 4 carbon atoms, that the alkenyl and alkynyl radicals contain 3 to 8 carbon atoms and that the aryl radicals are phenyl or α- or β-naphthyl radicals.

 More particularly, Ar represents a phenyl radical optionally substituted by one or more atoms or radicals, identical or different, chosen from halogen atoms and alkyl, alkoxy, amino, alkylamino, dialkoylamino, acylamino, alkoxycarbonylamino and trifluoromethyl radicals.

 More particularly still, Ar represents a phenyl radical optionally substituted by a chlorine or fluorine atom, or by an alkyl (methyl), alkoxy (methoxy), dialkoylamino (dimethylamino), acylamino (acetylamino) or alkoxycarbonylamino (tert-butoxycarbonylamino) radical. .

 According to the present invention, the new derivatives of taxol analogs of general formula (I) can be obtained by the action of an amine of general formula

in which R ₃ and R ₄ are defined as above on a derivative of the taxane of general formula:

in which R and Ar are defined as above, to obtain the product of general formula:

in which R and Ar are defined as above, G ₁ and G ₂ each represent a radical of general formula (III) or a protective group (CCI ₃ CH ₂ OCO-), it being understood that at least one of the radicals G ₁ and G ₂ represents a radical of general formula (III), followed, if necessary, by the replacement of the protective group or groups (CCI ₃ CH ₂ OCO-) with a hydrogen atom.

Generally, the action of the amine of general formula (V) on the taxane derivative of formula (VI) is carried out in an inert organic solvent such as a halogenated aliphatic hydrocarbon such as methylene chloride at a temperature between 0 ° C and the boiling temperature of the reaction mixture. In order to avoid the attack in position -7, it is particularly advantageous to operate in methylene chloride at a temperature below 50 ° C. By operating at a temperature above 50 ° C., optionally in the presence of a sufficient excess of amine of general formula (V), a mixture of the products of general formula (VII) is formed in which one of the radicals G ₁ or G ₂ represents a radical of general formula

(III) or in which the two radicals G ₁ and G ₂ each represent a radical of general formula (III).

The replacement of the protective group represented by G ₁ or G ₂ is generally carried out by treatment with zinc in acetic acid, optionally in the presence of methanol at a temperature between 30 and 80 ° C.

 The products of general formula (I) can be separated from their mixtures by preparative chromatography on appropriate supports.

The product of general formula (I) obtained by the process according to the invention can be purified by physical methods such as crystallization or chromatography on an appropriate support. The product of general formula (I) can optionally be transformed into an addition salt with mineral acids (hydrochloric, sulfuric, nitric, phosphoric acids) or organic acids (acetic, oxalic, maleic, fumaric acids).

 The products of general formula (VI) can be obtained according to the methods described in European patents EP-0253738 and EP-0253 739.

 The products of general formula (I), and in particular those for which R represents a tbutoxy radical, exhibit remarkable biological properties.

 In vitro, the measurement of the biological activity is carried out on the tubulin extracted from the pig brain by the method of M.L. Shelanski et al., Proc. Natl. Acad. Sci. USA, 70, 765-768 (1973). The study of the depolymerization of microtubules into tubulin is carried out according to the method of G. Chauvière et al., C.R. Acad. Sci., 293, Series II, 501-503 (1981). In this study, the products of general formula (I) were shown to be at least as active as taxol.

 In vivo, the products of general formula (I) have been shown to be active in mice grafted with melanoma B16 at doses between 1 and 10 mg / kg intraperitoneally, as well as on other liquid or solid tumors.

 Furthermore, the products of general formula (I) have a better water solubility than that of taxol or taxane derivatives which are the subject of European patent EP-0253 738.

 The following examples illustrate the present invention.

EXAMPLE 1

365 mg of t.butoxycarbonylamino-3-hydroxy-2-phenyl-3-propionate- (2R, 3S) acetoxy-4α benzoyloxy-2α epoxy-5β are introduced into a flask fitted with a magnetic stirrer and a condenser, 20 hydroxy-1β oxo-9 bis - [(trichloro-2,2,2 ethoxy) carbonyloxy] -7β, 10β taxene-11 yl-13α dissolved in 10 cm3 of methylene chlorine. 80 μl of 3-dimethylamino-propylamine are added. The reaction mixture is heated at 40 ° C under an argon atmosphere for 4 hours. The solution is washed with 2 times 10 cm3 of water. After drying and evaporation of the solvent, the residue obtained is purified by chromatography on a thick layer of silica, eluting with a methylene chloride-methanol mixture (8-2 by volume). This gives 250 mg of tbutoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) of 4-acetoxy-benzoylcxy-2α epoxy-5β, 20 hydroxy-1β oxo-9 (3-dimethylamino propyl) aminocarbonyloxy -10β (2,2,2-trichloroethoxy) carbonyloxy] -7β taxene-11 yle- 13α whose structure is confirmed by the nuclear magnetic resonance spectrum of the proton determined in deuterated chloroform, the chemical shifts being expressed in ppm and the coupling constants (J) in Hertz:

 1.16 (s, 3H); 1.25 (s, 3H); 1.35 (s, 9H); 1.83 (s, 3H); 1.93 (s, 3H); 2.26 (s, 6H); 2.38 (s, 3H); 3.25 (m, 2H); 3.93 (d, J = 7.1H); 4.16 and 4.33 (2d, J = 9.2H); 4.62 (s, broad, 1H); 4.73 and 4.99 (2d, J = 12.2H); 4.96 (d, J = 9.1H); 5.29 (d, J = 9.1H); 5.47 (d, J = 9.1H); 5.54 (m, 1H); 5.66 (d, J = 7.1H); 6.19 (t, J = 9.1H); 6.29 (s, 1H); 7.37 (5H); 7.49, 7.62 and 8.09 (5H).

 To a solution of 137 mg of the product obtained previously in an actic acid-methanol mixture (1-1 by volume), 130 mg of powdered zinc are added. The reaction mixture is stirred at 60 ° C for 1 hour. After filtration and concentration to dryness, the residue is taken up in water and then extracted with ethyl acetate. After decantation and drying, the organic phases are concentrated to dryness. The residue obtained is purified by chromatography on a thick layer of silica, eluting with a methylene chloride-methanol mixture (8-2 by volume). 73 mg of tbutoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4α benzoyloxy-2α epoxy-5β, 20 dihydroxy-1β, 7β oxo-9 (dimethylamino-3 propyl) amino are thus obtained. - carbonyloxy-10β taxene-11 yle-13α which has the following characteristics:

 - ultraviolet spectrum (ethanol): λ max = 230 nm (ε = 12700)

 λ max = 275 nm (ε = 1040)

- infrared spectrum (in solution in methylene chloride): main characteristic absorption bands at 3400, 2960 and 1729 cm ^-1

 - proton nuclear magnetic resonance spectrum:

 1.18 (s, 3H); 1.23 (s, 3H); 1.33 (s, 9H); 1.66 (s, 3H); 1.87 (s, 3H); 2.28 (s, 6H); 2.38 (s, 3H); 3.20 (m, 2H); 3.78 (d, J = 7.1H); 4.17 and 4.31 (2d, J = 8.2H); 4.43 (dd, J = 6 and 12, 1H); 4.62 (br s, 1H); 4.97 (d, J = 9.1H); 5.26 (d, J = 9.1H); 5.54 (d, J = 9.1H); 5.66 (d, J = 7.1H); 6.21 (m, 2H); 7.39 (5H); 7.51, 7.62 and 8.11 (5H)

- mass spectrum (FAB): 936 (MH +)

 To a solution of the product obtained above in 0.5 cm3 of ethanol, 0.780 cm3 of a 0.1M hydrochloric acid solution is added. The reaction mixture is concentrated to dryness and then lyophilized. This gives tbutoxycarbonylamino-3-hydroxy-2-phenyl-3-propionate- (2R, 3S) hydrochloride of acetoxy-4α benzoyloxy-2α epoxy-5β, dihydroxy-1β, 7β oxo-9 (dimethylamino-3 propyl) aminocarbonyloxy -10β taxene-11 yle-13α with the following characteristics:

- rotary power: [α] ²⁰ D = -29 ° (c = 0.4; ethanol)

- proton nuclear magnetic resonance spectrum (CDCI ₃ -CD ₃ OD): 1.16 (s, 3H); 1.21 (s, 3H); 1.40 (s, 9H); 1.66 (s, 3H); 1.93 (s, 3H); 2.38 (s, 3H); 2.83 (s, 6H); 3.16 (m, 2H); 3.81 (d, J = 7.1H); 4.23 and 4.31 (2d, J = 8.2H); 4.38 (m, 1H); 4.58 (m, 1H); 4.99 (d, J = 9.1H); 5.16 (s, 1H); 5.66 (d, J = 7.1H); 6.16 (t, J = 9.1H); 6.26 (s, 1H); 7.37 (5H); 7.52, 7.70 and 8.09 (5H). EXAMPLE 2

 To a solution of 4.63 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 oxo-9 bis- (trichloro -2.2.2 ethoxy) carbonyloxy-7β, 10β taxene-11 yl-13α in 100 cm3 of acetonitrile, maintained under an argon atmosphere, 0.50 cm3 of 3-dimethylaminopropylamine is added. The reaction medium is heated with stirring for 3 hours at a temperature in the region of 60 ° C, then cooled to a temperature in the region of 20 ° C and concentrated to dryness under reduced pressure (2.7 kPa) at 40 ° C. 5.3 g of a white meringue are obtained which is purified by chromatography on 150 g of silica (0.063-0.2 mm) contained in a column 4 cm in diameter [eluent: dichloromethane-methanol (95-5 by volume)] by collecting fractions of 100 cm3. Fractions 1 to 10 are eliminated, then the chromatography is continued, eluting with a mixture: dichloromethane-methanol (80-20 by volume). Fractions 17 to 30 are combined and concentrated to dryness under reduced pressure (2.7 kPa) at a temperature in the region of 40 ° C. 2.57 g of a mixture are thus obtained in molar proportions: 66/33 of the two substitution derivatives, [(3-dimethylamino propyl) carbamoyloxy] -, respectively in position 10 and 7.

 The above mixture is separated by high performance liquid chromatography on 400 g of support, the preparation of which is described below, contained in a column 25 cm long and 6 cm in diameter with the hexane-ethanol mixture as mobile phase ( 80-20-2.5 by volume) at a flow rate of 45 cm3 / minute. We obtain by successive elution order:

 - 0.46 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 [(dimethylamino-propyl) carbamoyloxy] -7β oxo -9 (2,2,2-trichloroethoxy) carbonyloxy-10β taxene-11 yle-13α in the form of a white meringue,

 - 0.81 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 [(dimethylamino-propyl) carbamoyloxy] - 10β oxo-9 (2,2,2-trichloroethoxy) carbonyloxy-7β taxene-11 yle-13α in the form of a white meringue.

The support can be prepared as follows: In a 6 liter three-necked flask, 600 g of aminopropyl silica (100 Å - 10 μm - NH ₂ ; Macherey-Nagel) are suspended in 2 liters of dimethylformamide. 95 g of N-tert-butoxycarbonylamino-11 undecanoic acid anhydride are added and the reaction mixture is stirred for 18 hours at a temperature in the region of 20 ° C. The silica is separated by filtration and washed successively with twice 1500 cm3 of dichloromethane then twice 1500 cm3 of dimethylformamide. The silica thus washed is resuspended in 2 liters of dimethylformamide and 95 g of N-tert-butoxycarbonylamino-11 undecanoic acid anhydride are added, then the reaction mixture is stirred for 18 hours at a temperature in the region of 20 ° C .

 The silica is separated by filtration, washed successively twice

600 cm3 of dichloromethane, twice 600 cm3 of tetrahydrofuran, twice

600 cm3 of methanol and twice 600 cm3 of diethyl ether and then dried under reduced pressure at a temperature in the region of 20 ° C. 610 g of silica is thus obtained, designated by the name "BOC-C ₁₁ -C ₃ -silica" in the form of a white powder, the structure of which is confirmed by the infrared spectrum and the elementary analysis

(found) is: C% = 8.8; H% = 1.7; N% = 1.2.

In a 6 liter three-necked flask, 607 g of silica "BOC-C ₁₁ - C ₃ -silica" are suspended in 2 liters of dichloromethane and 69 cm 3 of pyridine. 530 cm3 of dimethyloctylchlorosilane are added dropwise then the reaction mixture is stirred for 16 hours at a temperature in the region of 20 ° C. The solid obtained is separated by filtration and washed successively with twice 1 liter of dichloromethane, twice 1 liter of methanol, twice 1 liter of tetrahydrofuran, twice 1 liter of dichloromethane and twice 1 liter of diethyl ether and then dried under reduced pressure at a temperature in the region of 20 ° C. 712 g of silica are thus obtained, designated by the name "BOC-C ₁₁ -C ₃ -silica-O-Si (CH ₃ ) ₂ (CH ₂ ) ₇ CH ₃ " in the form of a white powder, the structure of which is confirmed by the infrared spectrum and whose elementary analysis (found) is: C% = 12.1; H% = 2.4; N% = 1.0.

In a 6-liter three-necked flask, 711 g of silica "BOC-C ₁₁ -C ₃ -silica-O-Si (CH ₃ ) ₂ (CH ₂ ) ₇ CH ₃ " are suspended in 2200 cm3 of a solution 6% by volume of trifluoroacetic acid in dichloromethane. The reaction mixture is stirred for 5 hours at a temperature in the region of 20 ° C. The silica is separated by filtration and washed successively with twice 1 liter of dichloromethane, twice 1 liter of a dichloromethane / diisopropylethylamine mixture (70/30 by volume), 1 liter of dichloromethane, twice 1 liter of tetrahydrofuran, twice 1 liter of methanol and twice 1 liter of diethyl ether then dried under reduced pressure to a temperature close to 50 ° C. The silica thus washed and dried is resuspended in 2 liters of a 6% by volume solution of trifluoroacetic acid in dichloromethane.

 The reaction mixture is stirred for 16 hours at a temperature in the region of 20 ° C. The silica is separated by filtration and washed successively twice

1.5 liters of dichloromethane, twice 1 liter of a dichloromethane / diisopropylethylamine mixture (70/30 by volume), 1.5 liters of dichloromethane, twice 2 liters of tetrahydrofuran, twice 2 liters of methanol and two 2 liters of diethyl ether and then dried under reduced pressure at a temperature in the region of 50 ° C. 607 g of silica are thus obtained, designated by the designation "C ₁₁ -C ₃ -silica-O-

If (CH ₃ ) ₂ (CH ₂ ) ₇ CH ₃ "in the form of a white powder whose structure is confirmed by the infrared spectrum and whose elemental analysis (found) is: C% = 8.8; H% = 1.7; N% = 1.3.

In a 4-liter three-necked flask, 400 g of silica "C ₁₁ -C ₃ - silica-O-Si (CH ₃ ) ₂ (CH ₂ ) ₇ CH ₃ " are suspended in 1800 cm3 of dimethylformamide. We add

42 g of 3,5-dinitro-benzoyl-D-phenylglycine and 30 g of 2-ethoxy-1-ethoxycarbonyl-1,2-dihydro-quinoline and the reaction mixture is stirred for 16 hours at a temperature in the region of 20 ° C. The silica is separated by filtration and washed successively with twice 1 liter of dichloromethane, twice 1 liter of tetrahydrofuran, twice 1 liter of methanol and twice 1 liter of diethyl ether. The silica thus washed is resuspended in 2 liters of dimethylformamide and 30 g of 2-ethoxy-1-ethoxycarbonyl-1,2-dihydro-quinoline and 42 g of 3,5-dinitro-3,5-benzoyl-D-phenylglycine are added and then the reaction mixture for 5 hours at a temperature in the region of 20 ° C. The silica is separated by filtration, washed successively with twice 1 liter of dimethylformamide, twice 1 liter of dichloromethane, twice 1 liter of tetrahydrofuran, twice

1 liter of methanol and twice 1 liter of diethyl ether then dried under reduced pressure at a temperature in the region of 140 ° C. 434 g of silica are thus obtained, designated by the name "DNB-D-Phg-C ₁₁ -C ₃ -silica-O-Si (CH ₃ ) ₂ (CH ₂ ) ₇ CH ₃ " in the form of a white powder, the structure is confirmed by the infrared spectrum and whose elementary analysis (found) is: C% = 12.3; H% = 1.8; N% = 2.1.

In a 4-liter three-necked flask, 434 g of silica "DNB-D- Phg-C ₁₁ -C ₃ -silica-O-Si (CH ₃ ) ₂ (CH ₂ ) ₇ CH ₃ " are suspended. liter of dichloromethane and 100 cm3 of dimethyloctylmethoxysilane are added, then the reaction mixture is stirred for 54 hours at a temperature in the region of 20 ° C. The silica is separated by filtration, washed successively with twice 1 liter of dichloromethane, twice

1 liter of methanol, twice 1 liter of tetrahydrofuran and twice 1 liter of dichloromethane then dried under reduced pressure at a temperature in the region of 140 ° C. 425 g of silica are thus obtained, designated by the name "DNB-D-Phg-C ₁₁ - C ₃ -silica-O-Si (CH ₃ ) ₂ (CH ₂ ) ₇ CH ₃ reoctylated" in the form of a white powder, the structure is confirmed by the infrared spectrum and whose elementary analysis

(found) is: C% = 12.7; H% ≈ 1.9; N% = 2.0.

In a 4-liter three-necked flask, 425 g of silica "DNB-D- Phg-C ₁₁ -C ₃ -silica-OSi (CH ₃ ) ₂ (CH ₂ ) ₇ CH ₃ reoctylated" are suspended in 1.3 liters dichloromethane. 545 cm3 of trimethylsilylimidazole are added dropwise and the reaction mixture is stirred for 15 hours at a temperature in the region of 20 ° C. The solid obtained is separated by filtration and washed successively with twice 1 liter of tetrahydrofuran, twice 1 liter of methanol, twice 1 liter of acetone and twice 1 liter of dichloromethane and then dried under reduced pressures at a temperature in the region of 20 ° C. 431 g of silica are thus obtained, designated by the name "DNB-D-Phg- C ₁₁ -C ₃ -silica- [O-Si (CH ₃ ) ₂ (CH ₂ ) ₇ -CH ₃ ]" in powder form white whose structure is confirmed by the infrared spectrum and whose elementary analysis (found) is: C% = 13.7; H% = 2.2; N% = 2.0.

 N-tert-butoxycarbonylamino-11 undecanoic acid anhydride can be prepared as follows:

 To a solution of 30.1 g of N-tert-butoxycarbonylamino-11-undecanoic acid in 480 cm3 of ethyl acetate, maintained at a temperature in the region of 5 ° C, a solution of 10.63 is added over 10 minutes. g of N, N'-dicyclohexylcarbodiimide in 120 cm3 of ethyl acetate. The reaction mixture is stirred for 1 hour at a temperature in the region of 5 ° C and then for 16 hours at a temperature in the region of 20 ° C. The pecipitate is separated by filtration and washed with 30 cm3 of ethyl acetate. The filtrate is concentrated under reduced pressure at 30 ° C. The solid obtained is dried under vacuum at a temperature in the region of 30 ° C. 31 g of N-tert-butoxycarbonylamino-11-undecanoic acid anhydride are thus obtained, melting at 58 ° C.

 N-tert-butoxycarbonylamino-11 undecanoic acid can be prepared according to the method described by J.T. SPARROW, J. Org. Chem., 41.1350 (1976).

A solution of 104 mg of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β-20 hydroxy-1 [(dimethylamino-3 propryl) carbamoyloxy] - 10β oxo-9 (2,2,2-trichloroethoxy) carbonyloxy-7β taxene-11 yle-13α previously obtained, in a mixture of 8 cm3 of methanol and 8 cm 3 of acetic acid is heated with stirring and under an argon atmosphere to a temperature in the region of 60 ° C. and then added with 1.2 g of zinc powder. The reaction mixture is then stirred for 1 hour 30 minutes at 60 ° C then cooled to a temperature in the region of 20 ° C and filtered through sintered glass lined with celite. The sintered glass is washed with 3 times 5 cm 3 of dichloromethane and the filtrates are combined and then concentrated to dryness under reduced pressure (2.7 kPa) at a temperature in the region of 40 ° C.

 5 cm 3 of water and 5 cm 3 of ethyl acetate are added to the residue. The aqueous phase is separated by decantation and then reextracted with 3 times 5 cm3 of ethyl acetate. The organic phases are combined, dried over magnesium sulfate, filtered and then concentrated to dryness under reduced pressure (2.7 kPa) at 40 ° C. 19 mg of tert-butoxycarbonylamino-3-hydroxy-2-phenyl-3-propionate- (2R, 3S) of acetoxy-4-benzoyloxy-2α-epoxy-5β, dihydroxy-1,7β [(dimethylamino-propyl) carbamoyloxy] are obtained. -10β oxo-9 taxene-11 yle-13α in the form of a white meringue, the characteristics of which are as follows:

- NMR spectrum (400 MHz; CDCI ₃ )

δ (ppm): 1.30 (2s, 3H each: -CH ₃ 16 and 17); 1.38 (s, 9H: -C (CH ₃ ) ₃ ); 1.70 (s,

3H: -CH ₃ 18 or 19); 1.90 (s, 3H: -CH ₃ 18 or 19); 1.90 [m, 2H:

-NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 2.2 to 2.90 [m, 15H: - (CH ₂ ) - 6, -CH ₂ - 14, -CH ₂ N (CH ₃ ) ₂ , -N (CH ₃ ) ₂ , -COCH ₃ ]; 3.2 and 3.4 [2m, 2H:

-NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 3.8 (d, 1H: -H 3); 4.2 and 4.34 (AB, 2H: -CH ₂ - 20):

4.45 (dd, 1H, J = 11 and 7: -H 7); 4.66 (bs, 1H: -H 2 '); 5.0 (bd, 1H, J = 9: -H 5); 5.3 (bs, 1H: -H 3 '); 5.6 [bd, 1H: -NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 5.68 (d, 1H, J = 7:

-H 2); 6.25 (m, 2H: -H 13 and -H 10); 6.4 [bs, 1H: -NHCOOC (CH ₃ ) ₃ ]; 7.2 to 7.4 (mt, 5H: - _{C 6} H ₅ 3 '); 7.5 [t, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.64 [t, 1H:

-OCOC ₆ H ₅ (-H 4)]; 8.12 [d, 2H: -OCOC ₆ H ₅ (-H 2 and -H 6)].

A solution of 59 mg of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 ρropionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 [(dimethylamino-3 propyl) carbamoyloxy] - 7β oxo-9 (2,2,2-trichloroethoxy) carbonyloxy-10β taxene-11 yle-13α previously obtained in a mixture of 6 cm3 of methanol and 6 cm3 of acetic acid is heated with stirring and under an atmosphere of argon up to a temperature close to 60 ° C. then added with 1.2 g of zinc powder. The reaction mixture is then stirred for 1 hour 30 minutes at 60 ° C then cooled to a temperature in the region of 20 ° C and filtered through sintered glass lined with celite. The sintered glass is washed with 3 times 5 cm3 of dichloromethane and the filtrates are combined then concentrated to dryness under reduced pressure (2.7 kPa) at a temperature close to

40 ° C. 5 cm 3 of water and 5 cm 3 of ethyl acetate are added to the residue. The aqueous phase is separated by decantation and then reextracted with 3 times 5 cm3 of ethyl acetate. The organic phases are combined, dried over magnesium sulfate, filtered and then concentrated to dryness under reduced pressure (2.7 kPa) at 40 ° C. We obtain

9 mg tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 dihydroxy-1,10β [(dimethylamino 3 propyl) carbamoyloxy] -7β oxo -9 taxene-11 yle-13α in the form of a white meringue, the characteristics of which are as follows:

- NMR spectrum (400 MHz; CDCI ₃ )

δ (ppm): 1.30 (2s, 3H each: -CH ₃ 16 and 17); 1.36 (s, 9H: -C (CH ₃ ) ₃ ); 1.82 (s,

3H: -CH ₃ 18 or 19); 1.95 (s, 3H: -CH ₃ 18 or 19); 1.88 [m, 2H:

-NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 2.2 to 2.70 [m, 15H: - (CH ₂ ) - 6, -CH ₂ - 14,

-CH ₂ N (CH ₃ ) ₂ , -N (CH ₃ ) ₂ , -COCH ₃ ]; 3.15 and 3.3 [2m, 2H: -NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 4.0 (d, 1H: -H 3); 4.2 and 4.38 (AB, 2H: -CH ₂ - 20);

4.68 (bs, 1H: -H 2 '); 4.96 (bd, 1H, J = 9 Hz: -H 5); 5.3 (bs, 1H: -H 3 '); 5.40 (dd, 1H, J = 11 and 7: -H 7); 5.5 [s + bs, 2H: -H 10 and -NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 5.7 [d + bs, 2H: -H 2 and -NHCOOC (CH ₃ ) ₃ ]; 6.22 (bt, 1H: -H 13); 7.2 to 7.4 (mt, 5H: -C ₆ H ₅ 3 '); 7.53 [t, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.65 [t, 1H: -OCOC ₆ H ₅ (-H4)]; 8.12 [d, 2H: -OCOC ₆ H ₅ -H 2 and -H 6)].

EXAMPLE 3

 By operating in a manner analogous to that described in Example 2, but starting from 6.95 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyI-3 propionate-

(2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 oxo-9 bis- (trichloro- 2,2,2 ethoxy) carbonyloxy-7β, 10β taxene-11 yle-13α and 0 , 94 g of (4-methyl-piperazinyl) -3 propylamine, after purification by high performance liquid chromatography, the methanol-ethanol-hexane-dichloromethane mixture (10-10-80-2 by volume) is obtained:

 - 1.37 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 {[(4-methyl piperazinyl) -3 propyl] carbamoyloxy} -10β oxo-9 (trichloro-2,2,2 ethoxy) carbonyloxy-7β taxene-11 yle-13α in the form of a white meringue,

2.17 g tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 {[(4-methyl piperazinyl) -3 propyl] carbamoyloxy} -7β oxo-9 (2,2,2-trichloroethoxy) carbonyloxy-10β taxene-11 yle-3α in the form of a white meringue.

 Tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 {[(methyl-4 piperazinyl) -3 propyl] carbamoyloxy} - 10β oxo-9 (2,2,2-trichloroethoxy) carbonyloxy-7β taxene-11 yle-13α is transformed into tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy -2α eρoxy-5β, 20 dihydroxy-1,7β {[(4-methylpiperazinyl) -3 propyl] carbamoyloxy} -10β oxo-9 taxene-11 yl-13α by the action of zinc in a mixture of methanol and acid acetic acid as described in Example 2 for tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 [(dimethylamino-propyl ) carbamoyloxy] -10β oxo-9 (trichloro-2,2,2 ethoxy) carbonyloxy-7β taxene-11 yl- 13α.

 The product thus obtained has the following characteristics:

- NMR spectrum (400 MHz; CDCI ₃ )

δ (ppm): 1.18 (s, 3H: -CH ₃ 16 or 17); 1.27 (s, 3H: -CH ₃ 16 or 17); 1.33 (s, 9H:

-C (CH ₃ ) ₃ ); 1.7 (s, 3H: -CH ₃ 19); 1.6 to 1.95 [mt, 3H: -OCONHC H ₂ CH ₂ CH ₂ N = and - (CH) -H 6]; 1.88 (s, 3H: -CH ₃ 18); 2.2 to 2.7 [mt, 13H:

-CH ₂ N (CH ₂ CH ₂ ) ₂ NCH ₃ , -CH ₂ - 14 and - (CH) - H 6]; 2.29 (s, 3H: = NCH ₃ ); 2.4 (s, 3H: -COCH ₃ ); 3.2 to 3.45 (mt, 2H: -OCONHCH ₂ CH ₂ CH ₂ N =); 3.8 (d, 1H, J = 7:

-H 3); 4.18 and 4.31 (2d, 1H each, J = 8: -CH ₂ - 20); 4.44 (dd, 1H, J = 11 and 7: -H

7); 4.63 (mf, 1H: -H 2 '); 4.97 (broad d, 1H, J = 10: -H 5); 5.27 (broad d, 1H, J = 9.5: -H 3 '); 5.4 [d, 1H, J = 9.5: -NHCOOC (CH ₃ ) ₃ ]; 5.67 (d, 1H, J = 7: -H 2);

6.20 (s, 1H: -H 10); 6.25 (mt, 1H: -H 13); 7.0 (mf, 1H: -NHC H ₂ CH ₂ N =); 7.25 to 7.45 (mt, 5H: -C ₆ H ₅ 3 '); 7.51 [t, 2H, J = 8: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.62

[t, 1H, J = 8: -OCOC ₆ H ₅ (-H 4)]; 8.13 [d, 2H, J = 8: -OCOC ₆ H ₅ (-H 2 and -H 6)].

To a solution of 5 mg of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, dihydroxy-1,7β {[(4-methyl piperazinyl ) -3 propyl] carbamoyloxy} -10β oxo-9 taxene- 11 yl-13α obtained previously, in 0.1 cm3 of a 0.1N aqueous solution of hydrochloric acid, 0.2 cm3 of distilled water is added and lyophilizes the solution obtained. 5 mg of tert-butoxycarbonylamino-3 hydroxy-2-phenyl-3 ρropionate- (2R, 3S) acetoxy-4-benzoyloxy-2α epoxy-5β, 20 αihydroxy-1,7β {[(methyl-4 piperazinyl) -3 propyl] carbamoyloxy} -10β oxo-9 taxene-11 yle-13α, the characteristics of which are as follows: - NMR spectrum (400 MHz; D ₂ O + ε CD ₃ COOD)

δ (ppm): 0.88 (s, 3H: -CH ₃ 16 or 17); 0.93 (s, 3H: -CH ₃ 16 or 17); 1.09 (s, 9H: -C (CH ₃ ) ₃ ); 1.4 (s, 3H: -CH ₃ 19); 1.4 to 1.9 (mt, 5H: -OCONHCH ₂ CH ₂ CH ₂ N =, -CH ₂ - 14 and - (CH) -H 6); 1.66 (s, 3H: CH ₃ 18); 2.09 (s, 3H: -COCH ₃ ); 2.32 (mt, 1H: - (CH) -H 6); 2.81 (s, 3H: -NCH ₃ ); 2.9 to 3.2 and 3.4 to 3.55 (2 mt 4H and 9H respectively: -OCONHCH ₂ CH ₂ CH ₂ N (CH ₂ CH ₂ ) ₂ NCH ₃ and -H 3); 4.01 (mt, 3H: -CH ₂ - 20 and -H 7); 4.36 (d, 1H, J = 6.6 Hz: -H 2 '); 4.6 to 4.8 (-H 3 ': signal canceled by the presaturation of the solvent signal); 4.84 (d broad, 1H, J = 9: -H 5): 5.34 (d, 1H, J = 7: -H 2); 5.82 (t, 1H, J = 9: -H 13); 6.01 (s, 1H: -H 10); 7.03 [t, 1H. J = 8: -C ₆ H ₅ 3 '(-H 4)]; 7.13 [d, 2H, J = 8: -C ₆ H ₅ 3 '(-H 2 and -H 6)]; 7.2 [t, 2H, J = 8:

-C ₆ H ₅ 3 '(-H 3 and -H 5)]; 7.38 [t, 2H, J = 8: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.51 [t, 1H,

J = 8: -OCOC ₆ H ₅ (-H 4)]; 7.8 [d, 2H, J = 8: -OCOC ₆ H ₅ (-H 2 and -H 6)].

 Tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 {[(methyl-4 piperazinyl) -3 propyl] carbamoyloxy} - 7β oxo-9 (2,2,2-trichloroethoxy) carbonyloxy-10β taxene-11 yle-13α is transformed into tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy -2α eρoxy-5β, 20 dihydroxy-1,10β {[(methyl-4 piρérazinyl) -3 propyl] carbamoyloxy} -7β oxo-9 taxene-11 yle-13α by the action of zinc in a mixture of methanol and acid acetic acid as described in Example 2 for tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 [(dimethylamino-propyl ) carbamoyloxy] - 10β oxo-9 (trichloro-2,2,2 ethoxy) carbonyloxy-7β taxene-11 yle-13α.

 The product thus obtained has the following characteristics:

- rotary power: [α] ²⁰ _D = -14 ° (c = 0.41; methanol)

- NMR spectrum (400 MHz; CDCI ₃ )

δ (ppm): 1.13 (s, 3H: -CH ₃ 16 or 17); 1.24 (s, 3H: -CH ₃ 16 or 17); 1.37 (s, 9H: -C (CH ₃ ) ₃ ); 1.6 to 2.0 [mt, 3H: -OCONHCH ₂ CH ₂ CH ₂ N = and - (CH) -H 6]; 1.84 (s, 3H: -CH ₃ 19); 1.92 (s, 3H: CH ₃ 18); 2.3 (d, 2H, J = 8.5: -CH ₂ - 14); 2.38 (s, 6H: = NCH ₃ and -COCH ₃ ); 2.3 to 2.8 [mt, 11H: -CH ₂ N (CH ₂ CH ₂ ) ₂ NCH ₃ and - (CH) - H 6]; 3.14 and 3.3 (2 mt, 1H each: -OCONHCH ₂ CH ₂ CH ₂ N =); 4.01 (d, 1H, J = 7: -H 3); 4.21 and 4.33 (2d, 1H each, J = 9: -CH ₂ - 20); 4.63 (br s, 1H: -H 2 ');

4.94 (d wide. 1H, J = 10: -H 5); 5.27 (broad d, 1H, J = 9.5: -H 3 '); 5.38 (dd, 1H, J = 11 and 7: -H 7); 5.44 [d, 1H, J = 9.5: -NHCOOC (CH ₃ ) ₃ ]; 5.51 (s, 1H: -H 10); 5.68

(d, 1H, J = 7: -H 2); 6.09 (mf, 1H: -NHCH ₂ CH ₂ CH ₂ N =); 6.21 (broad t, 1H, J = 8.5: -H 13); 7.25 to 7.45 (mt, 5H: -C ₆ H ₅ 3 '); 7.50 [t, 2H, J = 8: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.62 [t, 1H, J = 8: -OCOC ₆ H ₅ (-H 4)]; 8.10 [d, 2H, J = 8: -OCOC ₆ H ₅ (-H

2 and -H 6)].

 To a 5 mg solution of tert-butoxycprbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 dihydroxy-1,10β {[(4-methyl piperazinyl ) -3 propyl] carbamoyloxy} -7β oxo-9 taxene-11 yle-13α previously obtained, in 0.1 cm3 of an 0.1N aqueous solution of hydrochloric acid is added 0.3 cm3 of distilled water and lyophilize the solution obtained. 5 mg of tert-butoxycarbonylamino-3-hydroxy-2-phenyl-3-propionate- (2R, 3S) acetoxy-4-benzoyloxy-2α-epoxy-5β, 20 dihydroxy-1,10β {[(methyl-4) are thus obtained 5 mg ρipérazinyl) -3 propyl] carbamoyloxy} -7β oxo-9 taxene-11 yle-13α with the following characteristics:

- NMR spectrum (400 MHz; D ₂ O + ε CD ₃ COOD)

δ (ppm): 0.82 (s, 3H: -CH ₃ 16 or 17); 0.92 (s, 3H: -CH ₃ 16 or 17); 1.1 (s, 9H: -C (CH ₃ ) ₃ ); 1.4 to 1.8 (mt, 5H: -OCONHCH ₂ CH ₂ CH ₂ N =, -CH ₂ - 14 and - (CH) -H 6); 1.48 (s, 3H: -CH ₃ 19); 1.6 (s, 3H: CH ₃ 18); 2.1 (s, 3H, -COCH ₃ ); 2.28 (mt, 1H: - (CH) -H 6); 2.78 (s, 3H: -NCH ₃ ); 2.8 to 3.1 and 3.42 (mt and mf, respectively 4H and 8H: -OCONHCH ₂ CH ₂ CH ₂ N (CH ₂ CH ₂ ) ₂ NCH ₃ ); 3.57 (d, 1H, J = 7: -H 3); 4.01 and 4.1 (2d, 1H each, J = 8: -CH ₂ - 20 -H 7); 4.3 to 4.4 (-H 2 ': signal masked by the band of the solvent); 4.73 (d, 1H, J = 7: -H 3 '); 4.85 (broad d, 1H, J = 9: -H 5); 5.02 (mt, 1H: -H 7); 5.24 (s, 1H: -H 10); 5.32 (d, 1H, J = 7: -H 2); 5.82 (t, 1H, J = 9: -H 13); 7.02 [t, 1H, J = 8: -C ₆ H ₅ 3 '(-H 4)]; 7.12 [d, 2H, J = 8: -C ₆ H ₅ 3 '

(-H 2 and -H 6)]; 7.22 [t, 2H, J = 8: -C ₆ H ₅ 3 '(-H 3 and -H 5)]; 7.41 [t, 2H, J = 8:

-OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.52 [t, 1H, J = 8 -OCOC ₆ H ₅ (-H 4)]; 7.8 [d, 2H, J =

8: -OCOC ₆ H ₅ (-H 2 and -H 6)]. EXAMPLE 4

 By operating in a manner analogous to that described in Example 2, but starting from 6.95 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy- 2α epoxy-5β, 20 hydroxy-1 oxo-9 bis- (trichloro- 2,2,2 ethoxy) carbonyloxy-7β, 10β taxene-11 yl-13α and 0.88 cm3 of morpholino-3 propylamine, we after purification by high performance liquid chromatography, the methanol- (propanol-2) -hexane mixture (20-5-75 by volume) is obtained as mobile phase:

- 1.53 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 [(3-morpholino propyl) carbamoyloxy] -10β oxo-9 (2,2,2-trichloroethoxy) carbonyloxy-7β taxene-11 yl-13α shape of a white meringue,

 -1.35 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 [(3-morpholino propyl) carbamoyloxy] - 7β oxo-9 (2,2,2-trichloroethoxy) carbonyloxy-10β taxene-11 yle-13α in the form of a white meringue.

 Tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 [(morpholino-3 propyl) carbamoyloxy] -10β oxo-9 ( 2,2,2-trichloroethoxy) carbonyloxy-7β taxene-11 yle-13α is transformed into tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β , 20 dihydroxy-1,7β [(3-morpholino-propyl) carbamoyloxy] -10β oxo-9 taxene-11 yl-13α by the action of zinc in a mixture of methanol and acetic acid as described in Example 2 for the tert-butoxycarbonyl- 3-amino-2-hydroxy-3-phenyl-propionate- (2R, 3S) 4-acetoxybenzoyloxy-2α epoxy-

5β, 20 hydroxy-1 [(3-dimethylamino propyl) carbamoyloxy] -10β oxo-9 (trichloro-

2,2,2 ethoxy) carbonyloxy-7β taxene-11 yle-13α.

 The product thus obtained has the following characteristics:

- NMR spectrum (400 MHz; CDCI ₃ )

δ (ppm): 1.15 (s, 3H: -CH ₃ 16 or 17); 1.28 (s, 3H: -CH ₃ 16 or 17); 1.35 (s, 9H: -C (CH ₃ ) ₃ ); 1.68 (s, 3H: -CH ₃ 19); 1.65 to 1.9 (mt, 2H: -OCONHCH ₂ CH ₂ CH ₂ N =); 1.88 (s. 3H: -CH ₃ 18); 1.9 (mt. 1H: - (CH) - H 6); 2.28 (mt, 2H: -CH ₂ - 14); 2.4 (s, 3H: -COCH ₃ ); 2.45 to 2.75 [mt, 7H: - CH ₂ N (CH ₂ CH ₂ ) ₂ O and - (CH) - H 6]; 3.28 and 3.42 (2 mt, 1H each: -OCONHCH ₂ CH ₂ CH ₂ N =); 3.8 [mt, 5H: -CH ₂ N (CH ₂ CH ₂ ) ₂ O and -H 3]; 4.18 and 4.31 (2d, 1H each, J = 8.5: -CH ₂ - 20); 4.44 (dd. 1H, J = 11 and 7: -H 7); 4.63 (br s, 1H: -H 2 '); 4.98 (broad d, 1H, J = 10: -H 5); 5.27 (broad d, 1H. J = 9: -H 3 '); 5.41 [d, 1H. J = 9: -NHCOOC (CH ₃ ) ₃ ]; 5.67 (d, 1H, J = 7: -H 2); 6.21 (s, 1H: -H

10); 6.25 (mt, 1H: -H 13); 6.58 (wide t, 1H, J = 5: -NHCH ₂ CH ₂ CH ₂ N =); 7.25 to 7.45 (mt, 5H: -C ₆ H ₅ 3 '), 7.52 [t, 2H, J = 8: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.62 [t, 1H, J = 8: -OCOC ₆ H ₅ (-H 4)]; 8.12 [d, 2H, J = 8: -OCOC ₆ H ₅ (-H 2 and -H 6)].

Tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α eρoxy-5β, 20 hydroxy-1 [(morpholino-3 propyl) carbamoyloxy] -7β oxo-9 ( 2,2,2-trichloroethoxy) carbonyloxy-10β taxene-11 yle-13α is transformed into tert-butyoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 dihydroxy-1,10β [(3-morpholino-propyl) carbamoyloxy] -7β oxo-9 taxene-11 yl-13α by the action of zinc in a mixture of methanol and acetic acid as described in example 2 for tert-butoxycarbonyl-amino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 [(dimethylamino -3 propyl) carbamoyloxy] -10β oxo-9 (trichloro-

2,2,2 ethoxy) carbonyloxy-7βtaxene-11 yle-13α.

 The product thus obtained has the following characteristics:

- NMR spectrum (400 MHz; CDCI ₃ )

δ (ppm): 1.11 (s, 3H: -CH ₃ 16 or 17); 1.24 (s, 3H: -CH ₃ 16 or 17); 1.37 (s, 9H: -C (CH ₃ ) ₃ ); 1.6 to 1.9 (mt, 2H: -OCONHC H ₂ CH ₂ N =); 1.81 (s, 3H: -CH ₃ 19);

1.93 (s, 3H: CH ₃ 18); 1.93 (mt. 1H: - (CH) -H 6); 2.3 (d, 2H, J≈ 8: -CH ₂ - 14);

2.4 (s, 3H: -COCH ₃ ); 2.4 to 2.7 [mt, 7H: -CH ₂ N (CH ₂ CH ₂ ) ₂ O and - (CH) -H 6]; 3.12 and 3.31 (2 mt, 1H each: -OCONHCH ₂ CH ₂ CH ₂ N =); 3.5 (mf, 1H: -OH 2 '); 3.8

[mf, 4H: -CH ₂ N (CH ₂ CH ₂ O]; 4.0 (d, 1H, J = 7: -H 3); 4.2 and 4.33 (2d, 1H each, J = 8 , 5: -CH ₂ - 20); 4.64 (mf, 1H: -H 2 '); 4.94 (d wide, 1H, J = 9.5: -H 5); 5.28 (d wide , 1H, J = 9: -H 3 '); 5.38 (dd, 1H, J = 10 and 7: -H 7); 5.45 [d wide, 1H, J = 9: -NHCOOC (CH ₃ ) ₃ ]; 5.51 (s, 1H: -H 10); 5.68 (d, 1H, J = 7: -H 2); 5.8 (t, 1H, J =

5: -NHCH ₂ CH ₂ CH ₂ N =); 6.21 (t, 1H, J = 8: -H 13); 7.25 to 7.45 (mt, 5H: -C ₆ H ₅

3 '); 7.51 [t, 2H, J≈ 8: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.62 [t, 1H, J≈ 8: -OCOC ₆ H ₅ (-H 4)]; 8.12 [d, 2H, J = 8: -OCOC ₆ H ₅ (-H 2 and -H 6)].

EXAMPLE 5

To a solution of 0.29 g of tert-butoxycarbonylamino-3 hydroxy-2 ρhenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 oxo-9 bis- (trichloro -2.2.2 ethoxy) carbonyloxy-7β, 10β taxene-11 yl-13α in 100 cm3 of acetomtrile, maintained under an argon atmosphere, 0.31 cm3 of 3-dimethylaminopropylamine is added. The reaction medium is heated with stirring for 3 hours at a temperature in the region of 60 ° C, then cooled to a temperature in the region of 20 ° C and concentrated to dryness under reduced pressure (2.7 kPa) at 40 ° C. 0.32 g of a white meringue is obtained which is purified by chromatography on 30 g of alumina (0.12-0.15 mm) contained in a column 1.5 cm in diameter [eluent: dichloromethane -methanol (95-5 by volume)] by collecting 10 cm 3 fractions. Fractions 7 to 15 are combined and concentrated to dryness under reduced pressure (2.7 kPa) at a temperature in the region of 40 ° C. 0.12 g of tert-butoxycarbonylamino-3-hydroxy-2-phenyl-3-propionate- (2R, 3S) of acetoxy-4-benzoyloxy-2α-epoxy-5β, 20 hydroxy-1 bis - [(dimethylamino-propyl) is thus obtained ) carbamoyloxy] -7β, 10β oxo-9 taxene-11 yle-13α in the form of a white meringue, the characteristics of which are as follows:

- rotary power: [α] ²⁰ _D = - 26 ° (c = 0.75; methanol)

- NMR spectrum (400 MHz; CDCI ₃ )

δ (ppm): 1.17 (s, 3H: -CH ₃ 16 or 17); 1.20 (s, 3H: -CH ₃ 16 or 17); 1.36 (s, 9H: C (CH ₃ ) ₃ ); 1.6 to 1.8 [mt, 4H: -NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 1.78 (s, 3H: -CH ₃ 19); 1.83 (mt, 1H :-( CH) -H 6); 1.96 (s, 3H: CH ₃ 18); 2.26 [s, 6H: -N (CH ₃ ) ₂ ]; 2.36 (s, 3H: -COCH ₃ ); 2.2 to 2.6 [mt, 6H: -CH ₂ - 14 and -CH ₂ N (CH _{3) 2];} 2.66 (mt, 1H: - (CH) -H6); 3.24 [mt, 4H: -NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 3.92 (d, 1H, J = 7: -H 3); 4.16 and 4.3 (2d, 1H each, J = 8: -CH ₂ - 20); 4.62 (broad s, 1H: -H 2 '); 4.93

(d, 1H, J = 9: -H 5); 5.27 (mt, 1H: -H 3 '); 5.4 (mt, 1H: -H 7); 5.48 and 5.76 [2 mt, 1H each: -NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 5.55 [broad d, 1H: -NHCOOC (CH ₃ ) ₃ ];

5.64 (d, 1H, J = 7: -H 2); 6.16 (broad t, 1H, J = 9: -H 13); 6.32 (s, 1H: -H 10); 7.3 to 7.5 (mt, 5H: -C ₆ H ₅ 3 '); 7.5 [t, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.61 [t. 1H. J = 7.5: -OCOC ₆ H ₅ (-H 4)]; 8.1 [d, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 2 and -H 6)].

 To a solution of 10.6 mg of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 bis- [(dimethylamino-3 propyl) carbamoyloxy] -7β, 10β oxo-9 taxene-11 yle-13α previously obtained, in 0.2 cm3 of a 0.1N aqueous solution of hydrochloric acid, 0.4 cm3 of distilled water is added and lyophilized solution obtained. 10 mg of tert-butoxycarbonylamino-3-hydroxy-2-phenyl-3-propionate- (2R, 3S) acetoxy-4-benzoyloxy-2α-epoxy-5β, 20 hydroxy-1 bis- [(dimethylamino-3 propyl) are thus obtained. ) carbamoyloxy] -7β, 10β oxo-9 taxene-11 yle-13α, the characteristics of which are as follows:

- NMR spectrum (400 MHz; D ₂ O / CH ₃ COOD 90/10 by volume)

δ (ppm): 0.85 (s, 3H: -CH ₃ 16 or 17); 0.9 (s, 3H: -CH ₃ 16 or 17); 1.10 (bs, 9H:

-C (CH ₃ ) ₃ ); 1.5 (s, 3H: -CH ₃ 19); 1.6 to 1.8 [m. 10H: -CH ₃ 18.

-NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ , -CH _2- 14, - (CH) -H 6]; 2.10 (s, 3H: -COCH ₃ ); 2.3 (m, 1H: - (CH) - H 6); 2.65 [2s, 6H each: -N (CH ₃ ) ₂ ]; 2.8 to 3.1 [vbm, 8H: -CH ₂ N (CH ₃ ) ₂ , -NHCH ₂ CH ₂ CH ₂ N (CH ₃ ) ₂ ]; 3.6 (bd, 1H: -H 3); 4 and 4.15 (2d, AB,

2H: -CH ₂ - 20); 4.40 (bd, 1H: -H 2 '); 4.70 (vbs, 1H: -H 3 '); 4.90 (bd, 1H: -H 5);

5.10 (bdd, 1H: -H 7); 5.35 (bd, 1H: -H 2); 5.8 (bt, 1H: -H 13); 6.05 (s, 1H: -H 10); 7.0 to 7.25 (mt, 5H: -C ₆ H ₅ 3 '); 7.4 [t.2H, J = 7.5: -OCOC ₆ H ₅ (-H 3 and -H 5)];

7.5 [t, 1H, J = 7.5: -OCOC ₆ H ₅ (-H 4)]; 7.80 [d, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 2 and -H 6)]. EXAMPLE 6

 By following a procedure analogous to that described in Example 5, but starting with 1.18 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy- 2α epoxy-5β, 20 hydroxy- 1 oxo-9 bis- (trichloro- 2,2,2 ethoxy) carbonyloxy-7β, 10β taxene-11 yl-13α and 1.6 g of (4-methylpiperazinyl) -3 propylamine we obtain 1.1 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy- 1 bis- {[(methyl -4 piperazinyl) -3 propyl] carbamoyloxy} -7β, 10β oxo-9 taxene-11 yle-13α in the form of a white meringue, the characteristics of which are as follows:

- rotary power: [α] ²⁰ D = -22.9 ° (c = 0.51; methanol)

- NMR spectrum (400 MHz; CDCI ₃ )

δ (ppm): 1.24 (s, 3H: -CH ₃ 16 or 17); 1.28 (s, 3H: -CH ₃ 16 or 17); 1.4 (s, 9H: -C (CH ₃ ) ₃ ); 1.6 to 1.85 (mt, 4H: -OCONHCH ₂ CH ₂ CH ₂ N =); 1.83 (s, 3H: -CH ₃ 19); 1.87 (ddd, 1H, J = 15, 11 and 2: - (CH) -H 6); 2.01 (s, 3H: CH ₃ 18); 2.3 to 2.7 [mt, 31H: -CH ₂ N (CH ₂ CH ₂ ) ₂ NCH ₃ , -COCH ₃ and -CH ₂ - 14]; 2.7 (mt, 1H: - (CH) -H 6); 3.15 and 3.45 (mt, 4H: -OCONHCH ₂ CH ₂ CH ₂ N =); 4.0 (d, 1H, J = 7: -H 3); 4.21 and 4.32 (2d, 1H each, J = 8: -CH ₂ - 20); 4.66 (d, 1H, J = 2: -H 2 '); 4.98 (broad d, 1H, J = 9: -H 5); 5.28 (mt, 1H: -H 3 '); 5.4 to 5.5 [mt, 2H: -H 7 and -NHCOOC (CH ₃ ) ₃ ]; 5.7 (d, 1H, J = 7: -H 2); 6.0 and 6.4 (2 mf, 1H each: -NHCH ₂ CH ₂ CH ₂ N =); 6.21 (t, 1H, J = 9: -H 13); 6.4 (s, 1H: -H 10); 7.3 to 7.5

(mt, 5H: -C ₆ H ₅ 3 '); 7.51 [t, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.64 [t, 1H,

J = 7.5: -OCOC ₆ H ₅ (-H 4)]; 8.12 [d, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 2 and -H 6)].

 A solution of 0.35 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 bis- {[(methyl-4 ρipérazinyl) -3 propyl] carbamoyloxy} -7β, 10β oxo-9 taxene-11 yle-13α previously obtained, in 12 cm3 of a 0.1N aqueous solution of hydrochloric acid is lyophilized. 0.365 g of tert-butoxycarbonylamino-3-hydroxy-2-phenyl-3-propionate- (2R, 3S) acetoxy-4-benzoyloxy-2α epoxy-5β, 20 hydroxy-1 bis- {[(methyl -4 piperazinyl) -3 propyl] carbamoyloxy} - 7β, 10β oxo-9 taxene-11 yle-13α, the characteristics of which are as follows:

- rotary power: [α] ²⁰ _D = -22 ° (c = 0.41; methanol)

- NMR spectrum (400 MHz; D ₂ O)

δ (ppm): 1.1 (s, 3H: -CH ₃ 16 or 17); 1.14 (s, 3H: -CH ₃ 16 or 17); 1.36 (s, 9H:

-C (CH ₃ ) ₃ ); 1.72 and 1.92 (2s, 3H each: -CH ₃ 18 and -CH ₃ 19); 1.65 to 2.05 (mt, 7H: -OCONHCH ₂ CH ₂ CH ₂ N =, -CH ₂ - 14 and - (CH) -H 6); 2.38 (s, 3H: -COCH ₃ ); 2.55 (mt, 1H: - (CH) -H 6); 2.92 and 2.94 (2s, 6H: -NCH ₃ ); 3.0 to 3.7 (mt, 24H: -OCONHCH ₂ CH ₂ CH ₂ N (CH ₂ CH ₂ ) ₂ NCH ₃ ); 3.79 (d, 1H, J = 7: -H 3); 4.23 and 4.4 (2d, 1H each, J = 9: -CH ₂ - 20); 4.67 (d, 1H, J = 7: -H 2 '); 4.98 (mf, 1H: -H 3 ');

5.16 (broad d, 1H, J = 9: -H 5); 5.33 (dd, 1H, J = 11 and 7: -H 7); 5.58 (d, 1H, J = 7: -H 2); 6.07 (t, 1H, J = 9: -H 13); 6.28 (s, 1H: -H 10); 7.27 [t, 1H, J = 7.5: -C ₆ H ₅

3 '(-H 4)]; 7.38 [d, 2H, J = 7.5: -C ₆ H ₅ 3 '(-H 2 and -H 6)]; 7.48 [t, 2H, J = 7.5:

-C ₆ H ₅ 3 '(-H 3 and -H 5)]; 7.67 [t, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.78 [t, 1H, J = 7.5: -OCOC ₆ H ₅ (-H 4)]; 8.18 [d, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 2 and -H 6)].

EXAMPLE 7

 By operating in a manner analogous to that described in Example 5, but starting from 0.58 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R.3S) of acetoxy-4 benzoyloxy- 2α epoxy-5β, 20 hydroxy-1 oxo-9 bis- (trichloro- 2,2,2 ethoxy) carbonyloxy-7β, 10β taxene-11 yl-13α and 0.73 cm3 of morpholino-3 propylamine, we obtains 0.4 g of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 proρionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 bis- [(morpholino-3 propyl) carbamoyloxy -7β, 10β oxo-9 taxene-11 yle-13α in the form of a white meringue, the characteristics of which are as follows:

- rotary power: [α] ²⁰ _D = -24.7 ° (c = 0.52; methanol)

- NMR spectrum (400 MHz; CDCI ₃ )

δ (ppm): 1.25 (s, 3H: -CH ₃ 16 or 17); 1.28 (s, 3H: -CH ₃ 16 or 17); 1.41 (s, 9H: -C (CH ₃ ) ₃ ); 1.6 to 1.85 (mt, 4H: -OCONHCH ₂ CH ₂ CH ₂ N =); 1.81 (s, 3H: -CH ₃ 19); 1.89 (ddd, 1H, J = 15, 11 and 2: - (CH) -H 6); 2.0 (s, 3H: CH ₃ 18); 2.36 (mt, 2H: -CH ₂ - 14); 2.36 (s, 3H: -COCH ₃ ); 2.4 to 2.6 [mt, 12H: -CH ₂ N (CH ₂ ) ₂ O]; 2.7 (mt, 1H: - (CH) -H 6); 3.15 to 3.45 (mt, 4H: -OCONHCH ₂ CH ₂ CH ₂ N =); 3.76 [mt, 8H: -CH ₂ N (CH ₂ CH ₂ ) ₂ O]; 3.98 (d, 1H, J = 7: -H 3); 4.20 and 4.31 (2d, 1H each, J = 8: -CH ₂ - 20); 4.65 (d, 1H, J = 2: -H 2 '); 4.98 (broad d, 1H, J = 10: -H 5); 5.3 (broad d, 1H, J = 9: -H 3 '); 5.4 [d, 1H, J = 9: -NHCOOC (CH ₃ ) ₃ ]; 5.45 (mt, 1H: -H 7); 5.7 (d, 1H, J = 7: -H 2); 5.6 to 6.2 (mf, 2H: -NHCH ₂ CH ₂ CH ₂ N =); 6.22 (t, 1H, J = 9: -H 13); 6.38 (s, 1H: -H 10); 7.3 to 7.5 (mt, 5H: -C ₆ H ₅ 3 '); 7.51 [t, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.62 [t, 1H, J = 7.5: -OCOC ₆ H ₅ (-H 4)]; 8.11 [d, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 2 and -H 6)].

To a solution of 11.5 mg of tert-butoxycarbonylamino-3 hydroxy-2 phenyl-3 propionate- (2R, 3S) acetoxy-4 benzoyloxy-2α epoxy-5β, 20 hydroxy-1 bis- [morpholino-3 propyl ) carbamoyloxy] -7β, 10β oxo-9 taxene-11 yle-13α previously- ment obtained in 0.2 cm3 of a 0.1N aqueous hydrochloric acid solution, 0.4 cm3 of distilled water is added and the solution obtained is lyophilized. 12 mg of tert-butoxycarbonylamino-3-hydroxy-2-phenyl-3-propionate- (2R, 3S) acetoxy-4-benzoyloxy-2α-epoxy-5β, 20 hydroxy-1 bis- [3-morpholino-propyl) are thus obtained. carbamoyloxy] -7β, 10β oxo-9 taxene-11 yle-13α, the characteristics of which are as follows:

- NMR spectrum (400 MHz; D ₂ O / CH ₃ COOD: 90/10 by volume)

δ (ppm): 0.85 (s, 3H: -CH ₃ 16 or 17); 0.9 (s, 3H: -CH ₃ 16 or 17); , 1.1 (s, 9H: -C (CH ₃ ) ₃ ); 1.5 (s, 3H: -CH ₃ 19); 1.6 to 1.8 (m, 10H: -CH ₃ 18, -OCONHC _H2 CH ₂ CH ₂ N =, -CH2-14, - (CH) -H 6); 2.1 (s, 3H: -COCH ₃ ); 2.3 (m, 1H: - (CH) -H 6); 2.8 to 3.10 (vbm, 12H: -CH ₂ N (CH ₂ CH ₂ ) ₂ O); 3.3 (bm, 4H: -OCONHCH ₂ CH ₂ CH ₂ N =); 3.6 (bm, 4H: -CH ₂ N (CH ₂ CH2 _{) 2} O); 3.85 (bm, 4H: -CH ₂ N (CH ₂ CH2) ₂ O); 4 and 4.15 (bd, AB, 2H: -CH ₂ - 20); 4.4 (bd, 1H: -H 2 ');

4.75 (bs, 1H: -H 3 '); 4.9 (bd, 1H: -H 5); 5.1 (bdd, 1H: -H 7); 5.35 (bd, 1H: -H 2); 5.8 (bt, 1H: -H 13); 6.04 (s, 1H: -H 10); 7.0 to 7.25 (m. 5H: -C ₆ H ₅ 3 '); 7.4 [t,

2H, J = 7.5: -OCOC ₆ H ₅ (-H 3 and -H 5)]; 7.52 [t, 1H, J = 7.5: -OCOC ₆ H ₅ (-H 4)];

7.8 [d, 2H, J = 7.5: -OCOC ₆ H ₅ (-H 2 and -H 6)].

The new products of general formula (la) present particularly interesting biological activities.

The new products of general formula (la) show a significant inhibitory activity against abnormal cell proliferation and have therapeutic properties allowing the treatment of patients with pathological conditions associated with abnormal cell proliferation. Pathological conditions include abnormal cell proliferation of malignant or non-malignant cells of various tissues and / or organs including, but not limited to, muscle, bone or connective tissue, skin, brain, lungs, sexual organs, lymphatic or renal systems, mammary or blood cells, liver, digestive system, pancreas and thyroid or adrenal glands. These pathological conditions may also include psoriasis, solid tumors, ovarian, breast, brain, prostate, colon, stomach, kidney or testicular cancer, Kaposi's sarcoma, cholangio-carcinoma, choriocarcinoma, neuroblastoma, Wilms tumor, Hodgkin's disease, melanomas, multiple myelomas, chronic lymphocytic leukemias, acute or chronic granulocytic lymphomas. The new products according to the invention are particularly useful for the treatment of cancer of the ovary. The products according to the invention can be used to prevent or delay the onset or recurrence of pathological conditions or to treat these pathological conditions.

The products according to the invention can be administered to a patient in different forms adapted to the chosen route of administration which, preferably, is the parenteral route. Parenteral administration includes intravenous, intraperitoneal, intramuscular or subcutaneous administration. More particularly preferred is intraperitoneal or intravenous administration.

The present invention also includes pharmaceutical compositions which contain at least one product of general formula (Ia) in a sufficient amount suitable for use in human or veterinary therapy. The compositions can be prepared according to the usual methods using one or more pharmaceutically acceptable adjuvants, carriers or excipients. Suitable carriers include diluents, sterile aqueous media and various non-toxic solvents. Preferably the compositions are in the form of aqueous solutions or suspensions, injectable solutions which may contain emulsifying agents, dyes, preservatives or stabilizers.

The choice of adjuvants or excipients can be determined by the solubility and chemical properties of the product, the particular mode of administration and good pharmaceutical practices.

For parenteral administration, aqueous or non-aqueous sterile solutions or suspensions are used. For the preparation of non-aqueous solutions or suspensions can be used natural vegetable oils such as olive oil, sesame oil or paraffin oil or injectable organic esters such as ethyl oleate . The sterile aqueous solutions can consist of a solution of a pharmaceutically acceptable salt dissolved in water. The aqueous solutions are suitable for intravenous administration as long as the pH is suitably adjusted and the isotonicity is achieved, for example, by a sufficient amount of sodium chloride or glucose. Sterilization can be carried out by heating or by any other means which does not alter the composition.

It is understood that all the products entering into the compositions according to the invention must be pure and non-toxic for the quantities used. The compositions can contain at least 0.01% of therapeutically active product. The amount of active ingredient in a composition is such that a suitable dosage can be prescribed. Preferably, the compositions are prepared in such a way that a unit dose contains from 0.01 to 1000 mg approximately of active product for parenteral administration.

Therapeutic treatment can be carried out concurrently with other therapeutic treatments including antineoplastic drugs, monoclonal anti-coφs, immunological therapies or radiotherapies or modifiers of biological responses. Response modifiers include, but are not limited to, lymphokines and cytokines such as interleukins, interferons (α, β or δ) and TNF. Other chemotherapeutic agents useful in the treatment of disorders due to abnormal cell proliferation include, but are not limited to, alkylating agents such as nitrogen mustards such as mechloretamine, cyclophosphamide, melphalan and chlorambucil, alkyl sulfonates such as busulfan, nitrosoureas such as carmustine, lomusine, semustin and streptozocin, triazenes such as dacarbazine, antimetabolites such as folic acid analogs such as methotrexate, pyrimidine analogs such as fluorouracil and cytarabine, purine analogs like mercaptopurine and thioguanine, natural products like vinca alkaloids like vinblastine, vincristine and vendesine, epipodophyllotoxins like etoposide and teniposide, antibiotics like dactinomycin , daunorubicin, doxorubicin, bleomycin, plicamycin and mitomycin, enzymes c like L-asparaginase, various agents such as platinum coordination complexes such as cisplatin, substituted ureas such as hydroxyurea, methylhydrazine derivatives such as procarbazine, adrenocotic suppressants such as mitotane and amino-glutethymide , hormones and antagonists like adrenocorticosteroids like prednisone, progestins like hydroxyprogesterone caproate, methoxyprogesterone acetate and megestrol acetate, estrogens like diethylstilbestrol and ethynylestradiol, antioestrogens like tamoxifen, androgens like testosterone propionate and fluoxymesterone.

The doses used to implement the methods according to the invention are those which allow a prophylactic treatment or a maximum therapeutic response. The doses vary according to the form of administration, the particular product selected and the specific characteristics of the subject to be treated. In general, doses are those which are therapeutically effective for the treatment of disorders due to abnormal cell proliferation. The products according to the invention can be administered as often as necessary to obtain the desired therapeutic effect. Some patients may respond quickly to relatively large or low doses and may require low or no maintenance doses. Generally, low doses will be used at the start of treatment and, if necessary, increasing doses will be administered until an optimum effect is obtained. For other patients it may be necessary to administer maintenance doses 1 to 8 times a day, preferably 1 to 4 times, depending on the physiological needs of the patient concerned. It is also possible that for some patients it is necessary to use only one or two daily administrations.

In humans, the doses are generally between 0.01 and 200 mg / kg. Intraperitoneally, the doses will generally be between 0.1 and 100 mg / kg and, preferably between 0.5 and 50 mg / kg and, even more specifically between 1 and 10 mg / kg. Intravenously, the doses are generally between 0.1 and 50 mg / kg and, preferably between 0.1 and 5 mg / kg and, even more specifically between 1 and 2 mg / kg. It is understood that, in order to choose the most appropriate dosage, the route of administration, the patient's weight, his general state of health, his age and all the factors which may influence the effectiveness of the treatment must be taken into account.

The following example illustrates a composition according to the invention.

EXAMPLE

 40 mg of the product obtained in Example 1 are dissolved in 1 cm 3 of Emulphor EL 620 and 1 cm 3 of ethanol then the solution is diluted by adding 18 cm 3 of physiological saline.

 The composition is administered by introduction into an infusion of a physiological solution for 1 hour.

Claims

 CLAIMS 1 - New derivatives of taxol analogues of general formula

in which :

Ar represents an aryl radical,

R represents

 - a radical of general formula:

R ₇ O- (II)

in which R ₇ represents a straight or branched alkyl radical containing 1 to 8 carbon atoms, alkenyl containing 2 to 8 carbon atoms, alkynyl containing 3 to 8 carbon atoms, cycloalkyl containing 3 to 6 carbon atoms, cycloalkenyl containing 4 to 6 carbon atoms or bicycloalkyl containing 7 to 10 carbon atoms, these radicals being optionally substituted by one or more substituents chosen from halogen atoms and hydroxy radicals, alkyloxy containing 1 to 4 carbon atoms, dialkoylamino of which each alkyl part contains 1 to 4 carbon atoms, piperidino, moφholino, piperazinyl-1 (optionally substituted at-4 by an alkyl radical containing 1 to 4 carbon atoms or by a phenylalkyl radical in which the alkyl part contains 1 to 4 carbon atoms), cycloalkyl containing 3 to 6 carbon atoms, cycloalkenyl containing 4 to 6 carbon atoms, phenyl, cyano, carboxy or alkyloxycarbonyl of which the alk part oyle contains 1 to 4 carbon atoms,

 - or a phenyl radical optionally substituted by one or more atoms or radicals chosen from halogen atoms and alkyl radicals containing 1 to 4 carbon atoms or alkyloxy containing 1 to 4 carbon atoms,

- or a saturated or unsaturated nitrogen heterocyclyl radical containing 4 or 6 members and optionally substituted by one or more alkyl radicals containing 1 to 4 carbon atoms, it being understood that the cycloalkyl, cycloalkenyl or bicycloalkyl radicals may be optionally substituted by one or more alkyl radicals containing 1 to 4 carbon atoms,

R ₁ and R ₂ , identical or different, represent a hydrogen atom or a radical of general formula:

in which R ₃ and R ₄ , identical or different, represent a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms in an optionally substituted straight or branched chain:

a) by a hydroxy, carboxy or alkyloxycarbonyl radical, the alkyl part of which contains 1 to 4 carbon atoms and is optionally substituted by a phenyl radical, b) by a radical of general formula:

in which R ₅ and R ₆ , identical or different, represent a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms in a straight or branched chain, or alternatively R ₅ and R ₆ form together with the atom nitrogen to which they are linked a saturated or unsaturated 5 or 6-membered heterocycle optionally containing a second heteroatom chosen from nitrogen atoms (optionally substituted by an alkyl radical containing 1 to 4 carbon or benzyl atoms), oxygen or of sulfur, or else R ₃ and R ₄ form together with the nitrogen atom to which they are linked a saturated or unsaturated 5 or 6-membered heterocycle optionally containing a second heteroatom chosen from nitrogen atoms (optionally substituted by an alkyl radical containing 1 to 4 carbon or benzyl atoms), of oxygen or of sulfur, it being understood that at least one of the symbols R ₁ or R ₂ represents a radical of general formula (II) as well as, when they exist tent, their addition salts with acids.

2 - Process for the preparation of the new derivatives according to claim 1 characterized in that an amine of general formula is made to act:

in which R ₃ and R ₄ are defined as in claim 1 on a taxane derivative of general formula:

in which R and Ar are defined as in claim 1, to obtain a product of general formula:

in which R, Ar are defined as above, G ₁ and G ₂ each represent a radical of general formula (II) or a protective group (CCI ₃ CH ₂ OCO-), it being understood that at least one of the radicals G ₁ and G ₂ represents a radical of general formula (II), followed, if necessary, by the replacement of the protective group or groups (CCI ₃ CH ₂ OCO-) with a hydrogen atom, separates the products of general formula (I) from mixing them and isolating the product obtained optionally in the form of a salt. 3 - Process according to claim 2 characterized in that the amine of general formula (I) is reacted with the taxane derivative of general formula (III) by operating in an inert organic solvent such as a halogenated aliphatic hydrocarbon such as methylene chloride at a temperature between 0 ° C and the boiling temperature of the reaction mixture. 4 - Process according to claim 3 characterized in that the replacement of the 2,2,2-trichloroethoxycarbonyl protecting group with a hydrogen atom is carried out by means of zinc in acetic acid optionally in the presence of methanol at a temperature comprised between 30 and 80 ° C. 5 - Pharmaceutical composition characterized in that it contains a sufficient amount of a product according to claim 1 in combination with one or more diluents or pharmaceutically acceptable inert or pharmacologically active adjuvants.