Photosensitized, energy-transfer-mediated cyclization of 2-(1-arylvinyl)benzaldehydes to anthracen-9-(10H)-ones
A visible-light-induced photocatalytic intramolecular cyclization of 2-(1-arylvinyl)benzaldehydes is reported. The reaction is promoted in the presence of an IrIII photocatalyst and an amine base at room temperature under the irradiation of blue LEDs, affording 10-methylanthracen-9(10H)-one derivati...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/143359 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A visible-light-induced photocatalytic intramolecular cyclization of 2-(1-arylvinyl)benzaldehydes is reported. The reaction is promoted in the presence of an IrIII photocatalyst and an amine base at room temperature under the irradiation of blue LEDs, affording 10-methylanthracen-9(10H)-one derivatives in moderate to good yields with tolerance to various functional groups. A series of mechanistic experiments suggest that the reaction proceeds via energy transfer from the excited IrIII photocatalyst to the substrate to generate a diradical, which then undergoes 1,5-hydrogen shift, 6π electrocyclization, and aromatization leading to the cyclic product. |
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