A simple approach to indeno-coumarins via visible-light-induced cyclization of aryl alkynoates with diethyl bromomalonate?
Organic Chemistry Frontiers Pub Date: 2019-07-29 DOI: 10.1039/C9QO00795D
Abstract
Visible-light-induced triple-domino cyclization between aryl alkynoates and diethyl bromomalonate was developed for the synthesis of indeno-coumarins. This one-pot method substantially simplified the production process for indeno-coumarins and a series of indeno-coumarins could be isolated in moderate to high yields. It was found that the obtained indeno-coumarins could be used as additional photosensitizers to initiate this transformation. A possible radical mechanism accompanying the processes of electron transfer and energy transfer is proposed based on the results of ESI-MS analysis, cyclic voltammetry, Stern–Volmer quenching experiments and control experiments. The photoluminescence properties (emission spectra and quantum yields) of the obtained indeno-coumarins were investigated.
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Journal Name：Organic Chemistry Frontiers
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CAS no.: 89640-58-4
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