2-Electron-withdrawing-group-substituted 2-bromoanilides can be converted to the corresponding 3,3-disubstituted oxindoles with high efficiency under visible light irradiation by using fac-Ir(ppy)3 as the photoredox catalyst. This protocol is suitable for the synthesis of oxindoles with chloro and bromo atoms attached to the phenyl ring.
在可见光照射下,通过将2-抽电子基团取代的2-溴苯胺可以高效转化为相应的3,3-二取代的羟吲哚。 fac -Ir(ppy)3作为光氧化还原催化剂。该方案适用于合成具有连接在苯环上的氯和溴原子的羟吲哚。
Intramolecular Dehydrogenative Coupling Approach to 2‐Oxindoles Using Fe(OAc)
<sub>2</sub>
/NaI/Na
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S
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O
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A novel method for the synthesis of 2‐oxindoles from 1,3‐dicarbonyl compounds based on ferrous salt and iodide catalyst was described. Through a new catalytic oxidation system, the intramolecular dehydrogenation coupling reaction was completed by using catalytic amount of iodine.