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2-Pyridinecarboxylic acid, 3-(ethylsulfonyl)- synthesis

2synthesis methods
-

Yield:-

Steps:

Multi-step reaction with 4 steps
1.1: thionyl chloride / toluene; N,N-dimethyl-formamide / 2 h / 80 °C / Inert atmosphere
1.2: 1.25 h / 20 - 60 °C / Inert atmosphere
2.1: sodium hydroxide / water / 0.53 h / 20 °C / Inert atmosphere
2.2: 6 h / 30 °C / Inert atmosphere
3.1: potassium tungstate dihydrate; edetate disodium dihydrate; sulfuric acid / water / 6 h / 80 °C
3.2: 3 h / 50 °C
4.1: 5%-palladium/activated carbon; hydrogen; sodium carbonate / methanol / 11 h / 40 °C

References:

TW2016/5803,2016,A