期刊
ARKIVOC
卷 -, 期 -, 页码 111-121出版社
ARKAT USA INC
DOI: 10.3998/ark.5550190.0013.910
关键词
Pechmann; coumarins; phenols; beta-ketoesters; boric trisulfuric anhydride (BTSA); solvent-free reactions
资金
- Payame Noor University (PNU) research council
- Shiraz University research council
It is found that silica supported boric trisulfuric anhydride (BTSA. SiO2) is a novel, suitable and versatile catalyst for efficient and clean synthesis of coumarins via Pechmann cyclocondensation under mild and solvent-free conditions. Different kinds of phenols and beta-ketoesters were subjected to the cyclization reaction. Particularly, this catalyst makes the condensation of less activated phenols feasible. Besides the described benefits, the reported catalyst was applied successfully for the synthesis of novel coumarins from 3-acetyldihydrofuran-2(3H)-one as well as estradiol (sex hormone).
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