80638-08-0Relevant articles and documents
Synthesis method of bromhexine drug intermediate N-methyl-N-o-nitro benzyl cyclohexylamine
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Paragraph 0013; 0014, (2017/03/08)
The invention relates to a synthesis method of bromhexine drug intermediate N-methyl-N-o-nitro benzyl cyclohexylamine. The method comprises the following steps: feeding 600-650ml of cyclohexane and 0.69mol of N-methyl cyclohexylamine into a reaction vessel provided with a stirrer, a temperature gauge and a reflux condenser, and then slowly feeding 0.71-0.73mol of o-nitro benzyl amine into the reaction vessel; after that, continuously carrying out a reaction for 7-8 hours; feeding 200ml of sodium chloride solution into the reaction vessel, distilling to remove the cyclohexane, cooling the obtained solution to 10-13 DEG C, and feeding sodium sulfite solution into the cooled solution to adjust the pH of the solution to be 8-9; extracting the obtained solution by ethyl acetate, carrying out dehydration by a dehydrating agent, decoloring by a molecular sieve, and carrying out reduced pressure distillation to remove the ethyl acetate to obtain oily liquid; carrying out reduced pressure distillation, and collecting fraction at 105-110 DEG C to obtain the N-methyl-N-o-nitro benzyl cyclohexylamine, wherein the mass fraction of the sodium chloride solution is 15-20%, and the mass fraction of the sodium sulfite solution is 35-40%.