The current invention offers a process for the production of N-Boc-2-amino-3,3-dimethylbutyric acid by a reaction of tert-Leucine with di-tert-butyl-dicarbonate, the process comprising (i) contacting the tert-Leucine with di-tert-butyl-dicarbonate in an aqueous medium, opti0nally comprising a first organic solvent, in the presence of an inorganic base, (ii) optionally removing the first organic solvent, (iii) optionally extracting the resulting N-Boc-2-amino-3,3-dimethylbutyric acid into a second organic solvent, (iv) isolating the product by precipitation from the reaction mixture at acidic p H, and (v) optionally reuse the first and/or second organic solvents recovered from step (ii) and/or step (iv) for the next production cycle. The process is sufficiently short, uses preferably environmental friendly solvents, avoids waste and leads to good yields.
该发明提供了一种通过tert-亮
氨酸与双叔丁基二
碳酸酯反应制备N-Boc-2-
氨基-3,3-二甲基
丁酸的方法,该方法包括(i)在
无机碱存在下,在含有第一有机溶剂的
水介质中将tert-亮
氨酸与双叔丁基二
碳酸酯接触,(ii) 可选地去除第一有机溶剂,(iii) 可选地将产生的N-Boc-2-
氨基-3,3-二甲基
丁酸提取到第二有机溶剂中,(iv) 在酸性pH下从反应混合物中沉淀分离产物,(v) 可选地再利用从步骤(ii)和/或步骤(iv)回收的第一和/或第二有机溶剂进行下一个生产周期。该方法时间短,使用环保的溶剂,避免废弃物产生且产率高。