JPH044319B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is based on the general formula () (In the formula, R ₂ means a hydrogen atom or a hydroxyl group,
R ₁ means a hydrogen atom or a lower alkyl group having 1 to 2 carbon atoms which may be substituted with a hydroxyl group, and n
means an integer from 2 to 5) or a pharmaceutically acceptable salt thereof. The α-substituted ureidobenzylpenicillins represented by the general formula () above are new compounds that have not been described in any literature, and exhibit strong antibacterial activity against Gram-positive and Gram-negative bacteria, with particularly strong antibacterial activity against Pseudomonas bacteria. It is characterized by its superior in vivo activity compared to conventionally known compounds. That is, the compound represented by the above general formula () and its pharmaceutically acceptable salts are useful as antibacterial agents. Thus, an object of the present invention is to provide an excellent antibacterial compound represented by the general formula () and a pharmaceutically acceptable salt thereof. Since the α-substituted ureidobenzylpenicillins according to the present invention have a carboxyl group at the 3-position, they can form salts with various basic substances at the 3-position, and among them, salts can be formed with pharmaceutically acceptable basic substances. Salt is important. Examples of such salts include salts of inorganic bases, such as alkali metal salts such as sodium and potassium, alkaline earth metal salts such as calcium, and salts of organic bases such as procaine and dibenzylethylenediamine salts. These salts can be produced by conventional methods, ie, by treating the carboxyl group with an equimolar amount of the above-mentioned base. Optical isomers exist in the compounds of the present invention due to the asymmetric carbon atom in the 6-acetamido group. DL-, D-, and L-isomers, as well as optionally diastereomers, are present and are all within the scope of the present invention. The compound represented by the general formula () and α-substituted ureidobenzylpenicillins can be produced by various methods. For example, the general formula () (In the formula, R ₂₁ is a hydrogen atom, a hydroxyl group, or a protected hydroxyl group, R ₃ is a hydroxyl group or a protected hydroxyl group, and R ₁₁ is the same as R ₁ in the above general formula (), or in R ₁ When a hydroxyl group exists in , it means that it (etc.) is protected. n is the same as above.
Substituted ureido phenyl acetic acid or its reactive derivative and the general formula () (In the formula, R ₄ means a hydrogen atom or a protecting group.) is reacted with 6-aminopenicillanic acid or a reactive derivative thereof, and then R ₂₁ ,
If R ₃ , R ₄ or R ₁₁ has a protecting group, this production method is characterized by removing it (etc.). In the general formula (), the protecting group for the hydroxyl group contained in R ₂₁ , R ₃ and R ₁₁ may be any group that can be easily eliminated under mild conditions, such as formyl group, acetyl group, propionyl group, butyrin group. , an acyl group such as a chloroacetyl group, an aralkyl group such as a benzyl group, a benzhydryl group, or a trityl group, or a substituted aralkyl group having a substituent such as a methoxy group or a nitro group on the allyl nucleus thereof, a trimethylsilyl group, or a triethylsilyl group. , dimethylmethoxysilyl group, diethylmethoxysilyl group, trimethoxysilyl group, triethoxysilyl group, and also hydroxyl groups such as t-butyl group, methoxymethyl group, phenacyl group, tetrahydropyranyl group. The protective groups used can be mentioned. The reactive derivative of α-substituted ureidophenyl acetic acid represented by the general formula () means a derivative in which the carboxyl group involved in the reaction is activated. Examples include acid anhydrides, active esters, active amides, acid halides, and the like. Specifically, mixed anhydrides with aliphatic carboxylic acids such as pivalic acid, trichloroacetic acid, and pentanoic acid; alkyl carbonic acid mixed anhydrides; phenylphosphoric acid mixed anhydrides; aromatic carboxylic acid mixed anhydrides;
-Hydroxybenzotriazolyl ester, 2,
4-dinitrophenyl ester, N-hydroxysuccinimidyl ester, N-hydroxyphthalimidyl ester, pentachlorophenyl ester, phenylazophenyl ester, cyanomethyl ester, methoxymethyl ester; acid with imidazole, triazole, tetrazole, etc. Amide et al. In addition, when R ₄ means a protecting group, especially a group that can constitute an ester, the amide bond forming reaction is
N,N'-dicyclohexylcarbodiimide, N,N'-diethylcarbodiimide, N-cyclohexyl-N'-morpholinoethylcarbodiimide, N,N'-diisopropyl without converting substituted ureidophenylacetic acid into a reactive derivative, as a carboxylic acid. The reaction can also be carried out efficiently by using carbodiimides such as carbodiimide as a condensing agent. Furthermore, in the general formula (), R ₂₁ , R ₃ and
When all of the hydroxyl groups contained in R ₁₁ are protected, the α-substituted ureidophenyl acetic acid can be subjected to the reaction in the form of a halide. Acid halides can be obtained by using commonly used halogenating agents such as oxalyl chloride, thionyl chloride, or by combining dimethylformamide or N-methylformanilide with thionyl chloride, phosphorus oxychloride, trichloromethylchloroform, etc. A method is used in which a Vilsmeier reagent obtained by reaction with mate or phosgene is used. When R ₄ of 6-aminopenicillanic acid represented by the general formula () is a protecting group, examples of the protecting group include salts of alkali metals, alkaline earth metals, triethylamine, N-methylpiperidine, pyridine, etc. Inorganic or organic bases that can form, chloromethyl group, 2,2,2-trichloroethyl group, 2,
a halogenated lower alkyl group such as a 2,2-trifluoroethyl group, an aralkyl group such as a benzyl group, a benzhydryl group, a trityl group, or a substituted aralkyl group having a substituent such as a methoxy group or a nitro group on the allyl nucleus thereof; Examples include silyl groups such as trimethylsilyl, triethylsilyl, dimethylmethoxysilyl, diethylmethoxysilyl, trimethoxysilyl, and triphenylsilyl. Moreover, the reactive derivative of 6-aminopenicillanic acid means a derivative in which the 6-amino group is activated. Activation is carried out, for example, by the introduction of a silyl group, such as a trimethylsilyl group. The amide bond-forming reaction is preferably carried out in a solvent, and the solvent used is an inert organic solvent such as acetone, tetrahydrofuran, dimethylformamide, pyridine, acetonitrile, dioxane, chloroform, dichloromethane, dicrylethane, or ethyl acetate. Among these, hydrophilic solvents can also be used in combination with water. The reaction is usually carried out at cooling or room temperature, but
It may also be done under heating. That is, usually -
Selected from the range of 30 to 30℃, preferably α
-0 to 10°C when the substituted ureidophenylacetic acid is used in the form of active esters and active amides, -15 to -5°C when used in the form of acid anhydrides, and -20 to -20°C when used in the form of acid halides. -10℃. The reaction time varies depending on the reaction temperature, the compound used in the reaction, the solvent, etc., but is usually appropriately selected within the range of 0.5 to 48 hours, preferably 1 to 24 hours. After carrying out the amide bond forming reaction, if the product has a protecting group, it is removed. In the case of an acyl group, the protective group for the hydroxyl group contained in R ₂₁ , R ₃ and R ₁₁ can be removed by treatment with an inorganic or organic base. Examples of the inorganic base include sodium hydroxide, hydroxide, etc. Alkali metal hydroxides such as potassium, potassium earth metal hydroxides such as magnesium hydroxide and calcium hydroxide, alkali metal carbonate salts such as sodium carbonate and potassium carbonate, alkaline earth metal carbonate salts such as magnesium carbonate and calcium carbonate, Examples include alkali metal bicarbonates such as sodium hydrogen carbonate and potassium hydrogen carbonate, alkaline earth metal phosphates such as calcium phosphate, alkali metal hydrogen phosphates such as disodium hydrogen phosphate and dipotassium hydrogen phosphate, ammonia, etc. Examples of the base include alkali metal acetates, trialkylamines such as trimethylamine and triethylamine, and alcohol amines such as diethylaminoethanol and triethanolamine. Removal of the acyl group with these bases is carried out using water or an organic solvent having an alcoholic hydroxyl group (eg, methanol, ethanol, ethanolamine), or a mixture thereof. Preferred examples include methanolic ammonia and a triethylamine-triethanolamine-dimethylformamide mixture. When the protecting group is an aralkyl group or a substituted aralkyl group, it can be removed by catalytic reduction, for example using palladium-carbon. Furthermore, t-butyl groups, methoxymethyl groups, phenacyl groups, tetrahydropyranyl groups, etc. and silyl groups can be removed using an inorganic acid such as hydrochloric acid. The protective group of the carboxyl group represented by R ₄ can be removed by reduction with a metal and an acid, such as zinc-acetic acid, in the case of a halogenated lower alkyl group, and by catalytic reduction, such as palladium-acetic acid, in the case of an aralkyl group and substituted aralkyl group. This can be carried out by catalytic reduction using carbon, and in the case of aralkyl groups and substituted aralkyl groups, acids such as formic acid, trifluoroacetic acid, benzenesulfonic acid, p-toluenesulfonic acid, hydrochloric acid, organic compounds such as cation exchange resins, etc. Alternatively, it can be carried out using an inorganic acid, and the silyl group can be further removed by treatment with the above-mentioned acid or an alcohol such as methanol. When R ₄ is a salt-forming base, it can be removed by treatment with an acid. Isolation and purification of the target product from the reaction mixture can be easily carried out according to conventional methods. For example, extraction with organic solvents such as dichloromethane, chloroform, ethyl acetate, or activated carbon, silica gel, ion exchange resins, dextran crosslinked polymers,
This can be carried out by applying various chromatographies using porous polymers of styrene or acrylic esters. The α-substituted ureidophenylacetic acid represented by the general formula () is a new compound, but for example, a corresponding N-substituted benzoyl-N-substituted alkylcarbamate halide with a protected hydroxyl group is added to the corresponding α-aminophenylacetic acid. It can be produced by reacting and then, if necessary, removing the protecting group. The protecting groups used here and their removal means are as described above for the protecting groups of R ₃ , R ₂₁ and R ₁₁ . Other methods for producing the compound represented by the general formula () and α-substituted ureidobenzylpenicillins include:
General formula () (In the formula, R ₅ means a protected hydroxyl group.
R ₁₂ is a group corresponding to OR1, and when a hydroxyl group is present, it means that it is protected. Z means a halogen atom. ) N-benzoylcarbamic acid halides represented by the general formula () (wherein R ₂₁ and R ₄ are the same as above) is reacted with an α-aminobenzylpenicillin or a reactive derivative thereof, and then the protecting group present in the product is removed. It's a method. In the general formula (), the protecting groups contained in R ₅ and R ₁₂ are the same as those described for R ₃ and R ₁₁ , respectively. α− represented by the general formula ()
Reactive derivatives of aminobenzylpenicillins are derivatives whose α-amino group has been activated, and the activation is carried out by introducing a silyl group such as a trimethylsilyl group into the amino group. . The reaction is preferably carried out in a solvent, and examples of the solvent include acetone, tetrahydrofuran, acetonitrile, dimethylformamide, pyridine,
Inert organic solvents such as dioxane, chloroform, dichloromethane, dichloroethane, ethyl acetate are used. Among these, hydrophilic solvents can also be used in combination with water. The reaction is usually carried out at cooling or room temperature, but
Preferably it is 0 to 10°C. Reaction time is usually 1~
48 hours, preferably selected in the range of 1 to 10 hours. Removal of the protecting groups present in the product includes R ₂₁ ,
This is carried out by the same means as described for the removal of the protecting groups of R ₃ , R ₄ and R ₁₁ . The thus obtained target product is isolated and purified from the reaction mixture by the same means as described above. N-benzoylcarbamic acid halides represented by the general formula () are new compounds, but the corresponding benzamide is reacted with a carbonylating agent such as phosgene or trichloromethyl chloroformate in a relatively low boiling point solvent such as dichloromethane. It can be manufactured by The production of an optical isomer, which is a kind of α-substituted ureidobenzylpenicillin represented by the general formula (), is carried out in the above production method by using α-substituted ureido phenyl acetic acid (general formula ()) having the desired optical activity, α -By using aminobenzylpenicillins (general formula ()), N-
This can be carried out efficiently by using benzoylcarbamic acid halides (general formula ()). The above-mentioned optically active substance can be obtained by applying a conventional optical resolution technique to a racemate. The object compound of the present invention, that is, the compound represented by the general formula () and its pharmaceutically acceptable salts, can be formulated into forms suitable for various administration methods, as in the case of other penicillin compounds. Accordingly, embodiments of the invention include a variety of pharmaceutical compositions suitable for use in human or veterinary medicine. These compositions are provided in conventional manner using the necessary pharmaceutical carriers or excipients. That is, when provided as an injectable composition, it can take the form of a suspension, solution, or emulsion in an oily or aqueous vehicle. Suppositories may also be provided, using conventional suppository substrates such as cocoa milk fat or other glycerides. These compositions contain 0.1% according to the method of administration.
For example, they can contain from 5 to 99% of active substance, preferably from 10 to 60%. The dose for humans is usually 100 to
Selected in the 3000mg range. For example, 500 doses per day depending on the administration route, frequency, weight, age, and symptoms.
A dosage of ˜2000 mg is a preferred example. In order to show the pharmaceutical characteristics of the target compounds of the present invention, we will examine the minimum inhibitory concentration (MIC, μg/ml) against various bacteria and the results of experiments on the treatment of infection with Pseudomonas bacteria in mice (ED50). 6-[D(-)-α-(4-ethyl-2,3-dioxo-1-piperazinylcarbonylamino)phenylacetamide]penicillanic acid, which is conventionally known to be effective against the bacteria. (generic name piperacillin) and 6-[D(-)-
α-{3-(3,4-dihydroxybenzoyl)-
A comparison with 3-methyl-1-ureido}-α-phenylacetamido]penicillanic acid (hereinafter also referred to as compound Z, described in West German Patent Publication No. 2921324) is shown. 1. MIC measurement results (1) Test method In vitro antibacterial activity was measured by the agar plate multiple dilution method described below. One loopful of the test strain, cultured overnight in Heart Infusion Pros and diluted 100 to 1000 times, was inoculated onto Heart Infusion Agar (HI agar) containing each concentration of compound, and incubated at 37°C. After culturing for 20 hours, MIC was measured. (2) Results are shown in Table-1. Symbols (A, B, ...) indicating test compounds correspond to the symbols in Examples (the same applies hereinafter).

[Table] 2 ED ₅₀ measurement results (1) Test method ddY male mice 5 weeks old and weighing 21 to 25 g 5
The animals were used as one group. The bacterial strain to be tested is
The cells were cultured overnight at 37°C on Brain Heart Infusion Agar, suspended in 5% mucin, and administered intraperitoneally to mice. Test compounds were prepared at various concentrations and injected subcutaneously into mice 1 and 3 hours after inoculation. After 5 days, the ED ₅₀ value was calculated from the number of surviving mice at each dose. (2) Test results

[Table] The above results indicate that the target compound of the present invention has superior in vivo activity against bacteria, even though it is inferior to the target compound in in vitro activity. Examples are given below to specifically explain the method for producing the target compound of the present invention. Example 1 (1) 40 ml of a dry dichloromethane solution containing 11.5 g of triethylamine was added to a suspension of 70 ml of dry dichloromethane containing 5.0 g of N-(3-hydroxypropyl)-3,4-dihydroxybenzamide and 12.9 g of trimethylsilyl chloride on ice. -Drop with water cooling. The mixture is heated to reflux in a nitrogen atmosphere for 40 minutes, and then 2.8 ml of trichloromethyl chloroformate are added dropwise at -10 to -5°C while cooling. After gradually increasing the liquid temperature and stirring at 0 to 5°C for 2 hours, excess phosgene and the solvent are distilled off under reduced pressure. 80 ml of cooled dry dichloromethane is added to the residue, insoluble materials are removed by gravity filtration, and the mixture is subjected to the reaction described below. (2) 10.8g of anhydrous ampicillin and triethylamine
7.8 g of trimethylsilyl chloride is added dropwise to 100 ml of a dry dichloromethane solution containing 7.1 g at 5-10°C. After stirring at the same temperature for 1 hour, the above (1)
The dichloromethane solution prepared above is added dropwise at 0 to 5° C. while stirring. After stirring for 1 hour at 5-10°C, the mixture was evaporated to dryness under reduced pressure at room temperature, a mixture of 300 ml of ethyl acetate and 100 ml of cold 1N hydrochloric acid was added to the residue, and the organic layer was separated. The organic layer was added to cold saturated saline solution.
Wash with 300 ml and then extract in two portions with 300 ml of cold saturated aqueous sodium bicarbonate solution. The separated aqueous layer was washed with 100 ml of ethyl acetate, 250 ml of ethyl acetate was added thereto, the pH value was adjusted to approximately 1.5 with cold 6N hydrochloric acid, the aqueous layer was saturated by further addition of common salt, and the organic layer was separated. do. The organic layer was washed with 100 ml of cold saturated brine, dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue is subjected to column chromatography on activated carbon (for chromatography) and eluted with ethyl acetate. The eluate was collected and concentrated under reduced pressure until the volume was approximately 30 ml, and then added to 300 ml of n-hexane.
6-[D(-)-α-{3
-(3,4-dihydroxybenzoyl)-3-
(3-hydroxypropyl)-1-ureido}-
5.0 g of α-phenylacetamide penicillanic acid (hereinafter also referred to as compound A) is obtained as a white powder. IR ν ^KBr _nax (cm ^-1 ): 3700~2300, 1775, 1675,
1600, 1515 NMR (DMSO−d ₆ , 60MHz) δ (ppm):
1.41 (3H, s), 1.55 (3H, s), 1.4~2.0
(2H, br), 3.36 (2H, t, J=6Hz), 3.75
(2H, br), 4.20 (1H, s), 5.3~5.8 (3H,
m), 6.7-7.5 (8H, m), 9.2 (2H, br), UV λ ^EtOH _nax nm (ε): 209 (3.1×10 ⁴ ), 295 (6.3
×
10 ³ ), 225 (shoulder), 271 (6.1×10 ³ ) Ferric chloride color reaction: positive (dark green) (a) In Example 1 (1), N-(3-hydroxypropyl)-3, 4-dihydroxybenzamide
N-(2-hydroxyethyl) instead of 5.0g
Using 5.0 g of -3,4-dihydroxybenzamide and following the same treatment, 6-[D(-)-α
-{3-(3,4-dihydroxybenzoyl)-
3-(2-hydroxyethyl)-1-ureido}
4.9 g of -α-phenylacetamide] penicillanic acid (hereinafter also referred to as compound B) is obtained as a white powder. IR ν ^KBr _nax (cm ^-1 ): 3700~2200, 1755, 1675,
1600, 1515 NMR (DMSO−d ₆ , 60MHz) δ (mmp):
1.42 (3Hs), 1.56 (3H, s), 3.2~4.0 (4H,
m), 4.21 (1H, s) 5.3-5.8 (3H, m), 6.7
~7.6 (8H, m), 9.2 (2H, br) UV λ ^EtOH _nax nm (ε): 208 (2.8×10 ⁴ ), 221 (shoulder),
262 (6.8×10 ³ ), 295 (5.2×10 ³ ) Ferric chloride color reaction: Positive (dark green) (b) In Example 1 (1), N-(3-hydroxypropyl)-3,4 -dihydroxybenzamide
5.0 g of N-(5-hydroxybentyl)-3,4-dihydroxybenzamide instead of 5.0 g
Using , and following similar processing, 6-[D(-)-
α-{3-(3,4-dihydroxybenzoyl)
5.2 g of -3-(5-hydroxybentyl)-1-ureido}-α-phenylacetamide] penicillanic acid (hereinafter also referred to as compound C) is obtained as a white powder. IR ν ^KBr _nax (cm ^-1 ): 3700~2200, 1770, 1675,
1600, 1515 NMR (DMSO-d ₆ , 60MHz) δ (ppm): 1.3
(6H, brs), 1.41 (3H, s), 1.55 (3H, s),
3.1~3.9 (4H, m), 4.21 (1H, s), 5.3~5.8
(3H, m), 6.7-7.5 (8H, m), 9.14 (1H,
d, J=7Hz), 9.24 (1H, d, J=7Hz) UV λ ^EtOH _nax nm (ε): 207 (2.2×10 ⁴ ), 225 (shoulder),
272 (4.0×10 ³ ), 293 (4.3×10 ³ ) Ferric chloride color reaction: Positive (dark green) (c) N-(3-hydroxypropyl)-3,4 in Example 1(1) -dihydroxybenzamide
If 5.0 g of N-{2-(2-hydroxyethoxy)ethyl}-3,4-dihydroxybenzamide is used instead of 5.0 g and treated in the same manner, 6
-[D(-)-α-{3-(3,4-dihydroxybenzoyl)-3-{2-(2-hydroxyethoxy)ethyl}-1-ureido]-α-phenylacetamide]penicillanic acid (hereinafter 5.2 g (also referred to as compound D) are obtained as a white powder. IR ν ^KBr _nax (cm ^-1 ): 3700~2200, 1775, 1675,
1600, 1515, 1050, NMR (DMSO-d ₆ , 60MHz) δ (ppm):
1.41 (3H, s), 1.55 (3H, s), 3.3~4.1
(8H, m), 4.20 (1H, s) 5.3~5.8 (3H,
m), 6.7-7.6 (8H, m), 9.08 (1H, d, J
= 7Hz), 9.20 (1H, d, J = 7Hz) UV λ ^EtOH _nax nm (ε): 207 (2.8×10 ⁴ ), 224 (shoulder),
270 (4.6×10 ³ ), 295 (4.6×10 ³ ) Ferric chloride color reaction: Positive (dark green) (d) In Example 1 (1), N-(3-hydroxypropyl)-3,4 -dihydroxybenzamide
N-(2-methoxyethyl)- instead of 5.0g
Using 5.0 g of 3,4-dihydroxybenzamide and 9.7 g of trimethylsilyl chloride,
Using 8.6g of triethylamine and following the same treatment, 6-[D(-)-α-{3-(3,4-
7.0 g of dihydroxybenzoyl)-3-(2-methoxyethyl)-1-ureido}-α-phenylacetamide] penicillanic acid (hereinafter also referred to as compound E) are obtained as a white powder. IR ν ^KBr _nax (cm ^-1 ): 3700~2300, 1775, 1675,
1600, 1515, 1055, NMR (DMSO-d ₆ , 60MHz) δ (ppm):
1.41 (3H, s), 1.56 (3H, s), 3.18 (3H,
s), 3.40 (2H, br), 3.85 (2H, br), 4.20
(1H, s), 5.3~5.8 (3H, m), 6.7~7.6
(8H, m), 9.11 (1H, d, J=7Hz), 9.15
(1H, d, J=7Hz) UV λ ^EtOH _nax nm (ε): 208 (2.8×10 ⁴ ), 224 (shoulder),
272 (5.9×10 ³ ), 295 (5.9×10 ³ ) Ferric chloride color reaction: Positive (dark green) Example 2 A suspension of 12.9 g of amoxicillin trihydrate in 70 ml of dry dichloromethane was 12.9 g of N,O-bis(trimethylsilyl)acetamide is added at 15°C, stirred until uniform, and the dichloromethane solution prepared in Example 1 (1) is added dropwise thereto at 5-10°C.
After stirring at the same temperature for 1 hour and evaporating to dryness under reduced pressure at room temperature, a mixture of 250 ml of ethyl acetate, 50 ml of tetrahydrofuran and 100 ml of cold 1N hydrochloric acid was added to the residue, and the organic layer was separated. The organic layer was added to cold saturated saline solution.
Wash with 300 ml, and then extract the target product in two portions with 300 ml of cold saturated aqueous sodium bicarbonate solution.
Add to this 250ml of ethyl acetate and 50ml of tetrahydrofuran.
ml of mixed solvent and adjust the pH value to approx. with cold 6N hydrochloric acid.
1.5 and then add common salt to saturate the aqueous layer, and then separate the organic layer. The separated organic layer is washed with 100 ml of cold saturated brine, dried over anhydrous magnesium sulfate, and the solvent is distilled off under reduced pressure. The residue is subjected to column chromatography on activated carbon (for chromatography) and eluted with acetone.
The eluate was collected and concentrated under reduced pressure until the liquid volume was about 30 ml. Then, this was added to 300 ml in ethyl ether with stirring to give 6-[D(-)-α{3-(3,4-
4.5 g of dihydroxybenzoyl)-3-(3-hydroxypropyl)-1-ureido}-α-(4-hydroxyphenyl)acetamide]penicillanic acid (hereinafter also referred to as compound F) is obtained as a white powder. IR ν ^KBr _nax (cm ^-1 ): 3700~2300, 1770, 1680,
1610, 1515, NMR (DMSO−d ₆ , 60MHz) δ (ppm):
1.42 (3H, s), 1.56 (3H, s), 1.3~1.9
(2H, br), 3.1~4.0 (4H, m), 4.20 (1H,
s), 5.3 to 5.7 (3H, m), 6.5 to 7.3 (7H, m),
9.0 (2H, br) UV λ ^E+OH _nax nm (ε): 206 (2.8×10 ⁴ ), 224 (2.2
×
10 ⁴ ), 276 (6.6×10 ³ ), 283 (6.4×10 ³ ), 295
(5.4×10 ³ ) Ferric chloride color reaction: Positive (dark green)

Claims (1)

[Claims] 1. General formula (In the formula, R ₂ means a hydrogen atom or a hydroxyl group,
R ₁ means a hydrogen atom or a lower alkyl group having 1 to 2 carbon atoms which may be substituted with a hydroxyl group, and n
means an integer of 2 to 5) or a pharmaceutically acceptable salt thereof. (In the formula, R ₅ means a protected hydroxyl group. R ₁₂
is a group corresponding to OR1, and when a hydroxyl group is present, it means that it is protected. Z means a halogen atom. ) N-benzoylcarbamic acid halides and general formula (In the formula, R ₂₁ represents a hydrogen atom, a hydroxyl group, or a protected hydroxyl group, and R ₄ represents a hydrogen atom or a protective group.) A production method characterized in that protecting groups present in the product are removed.