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A general synthesis of N-hydroxyindoles
Audrey Wong1, Jeffrey T Kuethe, Ian W Davies
1Department of Process Research, Merck & Co., Inc., P.O. Box 2000, Rahway, New Jersey 07065, USA. audrey_wong@merck.com
The Journal of Organic Chemistry
|December 6, 2003
Summary
A novel lead-promoted method efficiently synthesizes N-hydroxyindoles via reductive cyclization. This operationally simple procedure yields N-hydroxyindoles with high purity and excellent yields, crucial for alkaloid synthesis.
Area of Science:
- Organic Chemistry
- Synthetic Methodology
Background:
- N-hydroxyindoles are valuable intermediates in organic synthesis.
- Existing methods for N-hydroxyindole formation can be complex or low-yielding.
Purpose of the Study:
- To develop a general, efficient, and operationally simple method for synthesizing N-hydroxyindoles.
- To demonstrate the utility of this method through the synthesis of a key alkaloid precursor.
Main Methods:
- Lead-promoted intramolecular reductive cyclization of o-nitrobenzyl ketones and aldehydes.
- Utilizing transfer hydrogenation conditions for the cyclization.
Main Results:
- High purity and excellent yields (>90%) of N-hydroxyindoles were achieved.
- A two-step synthesis of 1-methoxyindole-3-carboxaldehyde was successfully demonstrated.
- The developed method is operationally simple and broadly applicable.
Conclusions:
- The lead-promoted reductive cyclization offers a robust and efficient route to N-hydroxyindoles.
- This methodology provides a valuable tool for accessing complex indole derivatives, including natural products.