Preparation method of duloxetine key intermediate
A thienyl and methylamino technology, applied in the field of organic synthesis, can solve the problems of difficult separation and purification, unfavorable long-term use, cumbersome steps, etc., and achieves the effects of fewer reaction steps, economical savings, and simple process route.
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Embodiment 1
[0020] Example 1 Preparation of 3-N-methylamino-1-(2-thienyl)-1-acetone hydrochloride
[0021] Put 20ml of 2-acetylthiophene into a three-necked flask, add 160-200ml of methanol, 0.01-0.02g of concentrated hydrochloric acid, 16.2-25.7g of methylamine hydrochloride, and 6.8-8.6g of paraformaldehyde, and heat to reflux for reaction. After 9-10 hours, Crystals were precipitated, filtered, and recrystallized with pure water to obtain 32-33 g.
Embodiment 2
[0022] Example 2 Preparation of 3-N-methylamino-1-(2-thienyl)-1-acetone hydrochloride
[0023] Put 20ml of 2-acetylthiophene into a three-necked flask, add 160-200ml of ethanol, 0.01-0.02g of concentrated hydrochloric acid, 16.2-25.7g of methylamine hydrochloride, and 6.8-8.6g of paraformaldehyde, and heat to reflux for reaction. After 8-9 hours, Crystals were precipitated, filtered, and recrystallized with pure water to obtain 34-35 g.
Embodiment 3
[0024] Example 3 Preparation of 3-N-methylamino-1-(2-thienyl)-1-acetone hydrochloride
[0025] Put 20ml of 2-acetylthiophene in a three-necked flask, add 160-200ml of ethanol, 0.01-0.02g of concentrated sulfuric acid, 16.2-25.7g of methylamine hydrochloride, and 6.8-8.6g of paraformaldehyde, and heat to reflux for 9-10 hours. Crystals were precipitated, filtered, and recrystallized with pure water to obtain 35-36 g.
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