Lithium Hydroxide → 4-[3-(6-Amino-pyridin-3-ylethynyl)-2-ethyl-pyridin-4-yl]-2-chloro-benzoic acid

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Reaction Steps

The title compound is synthesized according to general procedure GP4 starting from 1.1 g (2.8 mmol) 4-[3-(6-Amino-pyridin-3-ylethynyl)-2-ethyl-pyridin-4-yl]-2-chloro-benzoic acid methyl ester (A-39) using 134 mg (5.6 mmoL) LiOH in a mixture of 100 mL THF and 20 mL water. After completion of the reaction, THF is removed under reduced pressure, the aqueous solution is acidified with 1N HCl to pH ˜1 before the pH is adjusted to 6 with saturated aqueous NaHCO3 solution. The precipitated product is collected by filtration, washed with water and methanol. Yield: 760 mg (72%).

Provenance & Evidence