Photochemical Approach to Fused Quinoxaline Derivatives From Allomaltol‐Containing Terarylenes With 2‐Aminooxazole Bridge Fragment via Trapping of Unstable Cyclopentene‐1,2‐Dione Intermediates
The photochemical behavior of terarylenes bearing allomaltol and 2‐aminooxazole fragments has been investigated, providing the basis for an efficient strategy toward substituted cyclopenta[b]quinoxalines. Upon irradiation of starting compounds with 400 nm visible light, the allomaltol moiety undergoes selectively E...