Abstract
The synthesis of limettin is studied. 5,7-dihydroxycoumarin was synthesized through phloroglucin and ethyl propionate by the catalysis of ZnCl2, with a yield of 97.7%. 5,7-dihydroxycoumarin was reacted with methylation reagents giving limettin. The conditions of methylation reaction were studied in detail and the optimization conditions determined with a yield of 75.7%: dimethyl sulfate was used as the methylation reagent, while dimethyl sulfate and 30% NaOH solution was dropped in alternatively. The mechanism of methylation reaction is discussed.
Original language | English |
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Pages (from-to) | 743-744+752 |
Journal | Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology |
Volume | 25 |
Issue number | 8 |
Publication status | Published - Aug 2005 |
Keywords
- Coumarin
- Methylation
- Synthesis