Abstract:
A process for producing alkyl group-substituted aromatic hydrocarbons, which comprises reacting an aromatic hydrocarbon (i) with an alkylating agent (ii) selected from the group consisting of an olefin, an aliphatic lower alcohol, and a alkyl halide in the presence of a mordenite zeolite catalyst treated with a fluorine-containing compound. This process enables raising the conversion of the aromatic compound and introducing a specific number of alkyl groups into specific positions of the aromatic compound. When biphenyl and propylene are used as the aromatic hydrocarbon and the alkylating agent, respectively, p,p'-diisopropylbiphenyl can be obtained in a high yield and a high selectivity.
Abstract:
A method for producing 3',4'-anhydrovinblastine, which comprises reacting catharanthine with vindoline in the presence of Fe , removing or inactivating the Fe , and reacting the reaction product with a reducing agent. 3',4'-Anhydrovinblastine is useful as an antineoplastic drug.
Abstract:
A method for producing 3',4'-anhydrovinblastine, which comprises reacting catharanthine with vindoline in the presence of Fe , removing or inactivating the Fe , and reacting the reaction product with a reducing agent. 3',4'-Anhydrovinblastine is useful as an antineoplastic drug.
Abstract:
The present invention relates to a process for the preparation, from e.g. anhydrovinblastine, of binary indole alkaloids effective as an anti-cancer drug, such as vinblastine, leurosidine, etc., wherein a trivalent iron source and hydride source are added in the presence of oxygen, thereby increasing a yield of an object compound. The yield of an object compound is improved still more by further addition, to the reaction system, of an oxalic acid ion source, malonic acid ion source, inorganic anion source, amino acid, etc.
Abstract:
This improved process for producing alkyl group-substd. aromatic hydrocarbons comprises reacting an aromatic hydrocarbon (1) with an alkylating agent (2) in the presence of a mordenite zeolite catalyst treated with a fluorine-contg. cpd. The alkylating agent (2) is selected from olefins, aliphatic lower alcohols, and alkyl halides (pref. propylene). The pref. aromatic hydrocarbon (1) is biphenyl, dibiphenyl or naphthalene. The typical product is p,p'-diisopropylbiphenyl. The fluorine-contg. cpds. can be hydrogen fluoride, ammonium fluoride, CF3Cl, SF6. As an example, 4,4'-dihydroxybiphenyl is produced by the acid-decomposition of 4,4'-diisopropyl biphenyldihydroperoxide which is obtd. by oxidising 4,4'-diisopropylbiphenyl with oxygen molecules. The above 4,4'-diisopropylbiphenyl is reacted with acylising agent to obtain 4,4'-diacyloxybiphenyl.
Abstract:
A method for producing 3',4'-anhydrovinblastine, which comprises reacting catharanthine with vindoline in the presence of Fe , removing or inactivating the Fe , and reacting the reaction product with a reducing agent. 3',4'-Anhydrovinblastine is useful as an antineoplastic drug.
Abstract:
This invention concerns a method for the production of dimeric alkaloid, characterized by a procedure which comprises causing reaction of catharanthine with vindoline in the presence of Fe3+ and (1) removing or inactivating the Fe3+ and allowing the reaction product to react with a reducing agent or (2) allowing presence of oxygen and a dicarboxylic acid or a derivative thereof in the reaction system and allowing the reaction product to react with a hydride source. In accordance with this invention, such dimeric alkaloid as vinblastine, leurocidin, and 3',4'-anhydrovin-blastine which are useful as antineoplastic drugs can be produced in high yields.
Abstract:
The present invention relates to a process for the preparation, from e.g. anhydrovinblastine, of binary indole alkaloids effective as an anti-cancer drug, such as vinblastine, leurosidine, etc., wherein a trivalent iron source and hydride source are added in the presence of oxygen, thereby increasing a yield of an object compound. The yield of an object compound is improved still more by further addition, to the reaction system, of an oxalic acid ion source, malonic acid ion source, inorganic anion source, amino acid, etc.
Abstract:
An improvement in a method of producing a keto acid having the general formula of (see formula I) wherein R1 and R2 independently represent an alkyl of 1-6 carbons or a cycloalkyl of 4-8 carbons, in an organic solvent, which comprises reacting a m-aminophenol having the general formula of (see formula II) wherein R1 and R2 are the same as above, with phthalic anhydride, the improvement comprising depositing the resultant keto acid in the solvent while effecting the reaction in a slurry.