34595-91-0Relevant articles and documents
IMIDAZOPYRIDINE DERIVATIVES AS ALPHA4BETA7 INTEGRIN INHIBITORS
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Paragraph 0460, (2020/05/28)
The present disclosure provides a compound of Formula (I): or a pharmaceutically acceptable salt thereof as described herein. The present disclosure also provides pharmaceutical compositions comprising a compound of Formula (I), processes for preparing co
Synthetic method of 2,3,5-trimethyl-6-bromopyridine
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Paragraph 0014; 0015; 0018; 0022, (2017/11/18)
The invention relates to the field of organic chemistry, in particular to a synthetic method of 2,3,5-trimethyl-6-bromopyridine. The synthetic method comprises the following steps: enabling diethyl malonate to react with alkali metal to generate salt, dropwise adding a toluene solution of 2,3-dimethyl-6-nitro-5-chloropyridine for condensation reaction and then decarboxylating under an acidic condition to obtain 2,3,5-trimethyl-6-nitropyridine; performing hydrogenation reduction on the 2,3,5-trimethyl-6-nitropyridine by taking methanol as a solvent under Pd/C catalysis, performing suction filtration and concentrating a filtrate to obtain 2,3,5-trimethyl-6-aminopyridine; enabling the 2,3,5-trimethyl-6-aminopyridine and acid to generate salt, cooling to 9 DEG C below zero to 4 DEG C, dropwise adding liquid bromine, dropwise adding a sodium nitrite aqueous solution after the completion of dropwise adding, regulating the pH of the solution to be alkaline after the completion of dropwise adding, extracting, drying and concentrating to obtain the 2,3,5-trimethyl-6-bromopyridine. The synthetic method provided by the invention has the benefits of being mild in reaction condition, high in yield, readily-available in raw material, lower in cost and short in process route and has industrial prospect.