期刊
RSC ADVANCES
卷 4, 期 101, 页码 57658-57661出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra10372f
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资金
- CSIR, New Delhi
- DST, New Delhi [SR/S1/OC-67/2010]
A facile and novel approach to the synthesis of 3-carbethoxy-isocoumarins and 3-alkylidenephthalides is described. The methodology employs DEAD/PPh3/TBHP as the reagent system proceeding through unprecedented 1,2-shift intramolecular ring expansion or simple elimination depending upon substituents present on 3-substituted phthalides, with broader substrate scope. This strategy is amply demonstrated in the short synthesis of bioactive molecules such as cytogenin and (Z)-3-butylidene-7-hydroxy-5-methoxyphthalide.
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