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Simple preparation of alpha-diazo esters
Douglass F Taber1, Ritesh B Sheth, Pramod V Joshi
1Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716, USA. taberdf@udel.edu
The Journal of Organic Chemistry
|March 25, 2005
Summary
This study presents a simplified method for synthesizing alpha-diazo esters. The efficient process yields high quantities of these valuable organic compounds.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Alpha-diazo esters are versatile synthetic intermediates.
- Existing methods for their preparation can be complex or low-yielding.
Purpose of the Study:
- To develop a simplified and high-yielding procedure for the synthesis of alpha-diazo esters.
- To enable the preparation of gram quantities of alpha-diazo esters.
Main Methods:
- Titanium tetrachloride (TiCl4)-mediated benzoylation of esters.
- Diazo transfer using p-acetoamidobenzenesulfonyl azide.
Main Results:
- High yields of alpha-benzoylated esters were achieved.
- Subsequent diazo transfer afforded alpha-diazo esters in good yield.
- The procedure is amenable to large-scale (gram quantity) synthesis.
Conclusions:
- A straightforward and efficient method for alpha-diazo ester synthesis has been established.
- This protocol facilitates the accessible preparation of significant quantities of alpha-diazo esters.