A Lewis acid catalyzed reaction of in situ generated 2H-indol-2-one (9) with various 2π and other electron-rich substrates has been developed. A variety of electron-rich substrates such as allyl/methallyltrimethylsilane, phenylacetylene, styrenes, acetophenone, and indoles have been used. The methodology provides a straightforward approach for the synthesis of 2-oxindoles with an all-carbon quaternary center at the pseudobenzylic position.
我们开发了一种
路易斯酸催化的原位生成
2H-吲哚-2-酮(9)与各种 2π 和其他富电子底物的反应。该方法使用了多种富电子底物,如烯丙基/甲基烯丙基三甲基
硅烷、
苯乙炔、
苯乙烯、
苯乙酮和
吲哚。该方法为合成在假苄基位置具有全碳季中心的 2-氧代
吲哚提供了直接的途径。