| 主权项 |
1. A method for preparing the salts of kukoamine B, the method comprising:
(1) reacting compound I with hydrobromic acid at 100-160° C, to generate compound II, wherein a stoichiometric ratio of compound I to hydrobromic acid is 1:2-5, (2) dissolving compound II in N, N-dimethylformamide to make a reaction system in a N, N-dimethylformamide solution environment, and then adding potassium carbonate and benzyl chloride, wherein the reaction is carried out at 60-100° C. to generate compound III, and wherein a stoichiometric ratio of compound II:potassium carbonate:benzyl chloride is 1:3-6:3-5; (3) adding compound III into sodium hydroxide solution, then adding methanol to make a reaction system in a methanol solution environment, wherein the reaction is carried out at 40-90° C. to generate compound IV, and wherein a stoichiometric ratio of compound III to sodium hydroxide is 1:1-3; (4) dissolving compound IV in dichloromethane, and then adding N, N-dimethylformamide to make a reaction system in an environment of a mixed solution containing N, N-dimethylformamide and dichloromethane, then adding thionyl chloride, wherein the reaction is carried out at 45-65° C. to generate compound V, and wherein a stoichiometric ratio of compound IV to thionyl chloride is 1:1-2; (5) combining compound VI with sodium hydroxide solution, and then adding ethanol solution of Di-tert-butyl dicarbonate, wherein the reaction is carried out at room temperature to generate compound VII, and wherein a stoichiometric ratio of sodium hydroxide:compound VI:Di-tert-butyl dicarbonate is 1-2:1:0.5-1; (6) dissolving compound VII in methanol to make a reaction system in a methanol solution environment, and then adding a methanol solution of acrylon, wherein the reaction is carried out at room temperature to generate compound VIII, and wherein a stoichiometric ratio of compound VII to acrylon is 1:1-2; (7) combining compound VIII with tetrahydrofuran and triethylamine to make a reaction system in an environment of mixed solution containing tetrahydrofuran and triethylamine, and then adding a tetrahydrofuran solution of benzyl chloroformate wherein the reaction is carried out at room temperature to generate compound IX, and wherein a stoichiometric ratio of compound VIII to benzyl chloroformate is 1:1-2; (8) placing compound IX into an autoclave, and adding saturated methanol solution of ammonia until compound IX is completely dissolved and then adding Raney nickel, a mass of which is equivalent to 10-50% of the compound IX, into the reaction solution, wherein aeration is applied to ensure the reaction system in hydrogen under 1-10 MPa, and wherein the reaction is carried out at 35-50° C. to generate compound X, (9) dissolving compound X in dichloromethane, and then adding triethylamine to make a reaction system in an environment of mixed solution containing dichloromethane and triethylamine, then adding the dichloromethane solution of compound V into a reaction solution at a temperature below 0° C., wherein the reaction generates compound XI, and wherein a stoichiometric ratio of compound X to compound V is 1:1-1.5; (10) dissolving compound XI in dichloromethane to make a reaction system in a dichloromethane environment, and then adding trifluoroacetic acid wherein the reaction is carried out at room temperature to generate compound XII, and wherein a stoichiometric ratio of compound XI to trifluoroacetic acid is 1:2-5; (11) dissolving compound XII in methanol, and then adding triethylamine to make a reaction system in an environment of mixed solution containing methanol and triethylamine, heating the reaction system to 50-80° C. and adding methanol solution of acrylon, cooling the reaction solution down to room temperature to carry out the reaction, which generates compound XIII, wherein a stoichiometric ratio of compound XII to acrylon is 1:1-2; (12) dissolving compound XIII in dichloromethane, and then adding triethylamine to make a reaction system in an environment of mixed solution containing dichloromethane and triethylamine, adding the dichloromethane solution of compound V into the reaction system at a temperature below 0° C., wherein the reaction generates compound XIV, and wherein a stoichiometric ratio of compound XIII to compound V is 1:1-1.5; (13) placing compound XIV into an autoclave, and adding mixed solution containing saturated methanol solution of ammonia and tetrahydrofuran until compound XIV is completely dissolved, such that the reaction system is in environment of solution thereof, and then adding Raney nickel, the mass of which is equivalent to 10-50% of the compound XIV, into the reaction system, wherein aeration is applied to ensure the reaction system in hydrogen under 1-10MPa, wherein the reaction is carried out at 35-50° C. to generate compound XV, and (14) placing, into an autoclave, compound XV and an inorganic acid including at least one of a hydrogenacid and an oxacid, or an organic acid including at least one of a carboxylic acid, hydroxy acid, sulfoacid and acidic amino acid, and adding a mixed solution containing methanol, tetrahydrofuran and water until compound XV is completely dissolved, such that a reaction system is in an environment of solution thereof, and then adding a palladium-carbon catalyst, the mass of which is equivalent to 10-30% of the compound XV, into the reaction system, wherein aeration is applied to ensure the reaction system in hydrogen under 1-10MPa, wherein the reaction is carried out at 25-45° C. to generate salt of kukoamine B, wherein a stoichiometric ratio of compound XV to acid is 1:1-8, the salt of kukoamine B having the chemical structure: wherein A comprises an inorganic acid including at least one of a hydrogenacid and oxacid, or an organic acid including at least one of carboxylic acid, hydroxy acid, sulfoacid and acidic amino acid. |
