1141669-69-3Relevant articles and documents
Preparation 2 - amino - 5 - CBZ - 4, 5, 6, 7 - tetrahydro-thiazolo [5, 4 - C] pyridine of the new method (by machine translation)
-
, (2019/01/23)
The invention discloses a process for preparing 2 - amino - 5 - CBZ - 4, 5, 6, 7 - tetrahydro-thiazolo [5, 4 - C] pyridine of the new method, comprises the following steps: N - tert-butoxycarbonyl - 4 - piperidone in pyridine with sulfur and single cyanamide mixed heating reaction→cooling→filtering→washed with an organic solvent, and dried to obtain a pale yellow solid product→in dichloromethane in trifluoroacetic acid is mixed with low-temperature reaction, concentrated→with triethylamine in dichloromethane in the mixed low-temperature drop chlorination benzyl formate, stirring reaction→[...]→dichloromethane extraction, the organic phase water, salt water washing, drying, filtering and concentrated to obtain crude product→ethyl acetate beating, the final product is obtained yellow solid. The invention of cheap price for raw materials to replace the original high price of the raw material for preparing the final product, to avoid the original ring-brominated by-product when many routes, not only the operation is simple, convenient purification, the cost is reduced, high yield, favorable to the industrialized production and cost control. (by machine translation)