Synthesis of visible-light mediated tryptanthrin derivatives from isatin and isatoic anhydride under transition metal-free conditions?
Organic Chemistry Frontiers Pub Date: 2017-09-18 DOI: 10.1039/C7QO00740J
Abstract
Visible-light mediated synthesis of diverse tryptanthrin derivatives catalyzed by an organic dye has been achieved. An energy transfer reaction process leads to the self-condensation of isatin, as well as the cross-condensation of isatin and isatoic anhydride. The irradiation of the reaction mixture with a 23 W fluorescent bulb in the presence of Rose Bengal provides a transition metal-free, environmentally friendly and inexpensive alternative approach to synthesize this important heterocycle.
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Journal Name：Organic Chemistry Frontiers
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CAS no.: 89640-58-4
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