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. 2010 Feb 6;66(13):2316–2321. doi: 10.1016/j.tet.2010.02.017

Table 3.

Synthesis of symmetrical 3,3-di(indolyl)indolin-2-ones from indoles and isatin derivatives in TMGT

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Entry R1 R2 R3 Product Yield (%)
1 H H H 4a 93
2 Me H OMe 4b 91
3 Me H Br 4c 86
4 H Me H 4d 90
5 Me H NO2 4e 88