Method of preparing 3-methylindole derivatives through hydrogenation
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United States of America Patent
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Issued Date -
Jul 10, 2003
app pub date -
Jan 2, 2003
filing date -
Jan 7, 2002
priority date (Note) -
Abandoned
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Abstract
There is disclosed a preparation method of 3-methylindole derivatives by reducing the aldehyde moiety in indole-3-carboxaldehyde derivatives in the presence of the copper or copper oxide-based hydrogenation catalyst. This process is performed in solvent under the condition of 50-300.degree. C. and 50-1,000 psig in the presence of a solvent with a hydrogen atmosphere. The method is advantageous in the economic aspects because of the employment of a relatively inexpensive hydrogenation catalyst and the easy regeneration thereof. Further, this process is environmentally safe because the intended addition of the sulfur components is not required therefor.
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