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. 2020 Mar 11;11(14):3719–3726. doi: 10.1039/d0sc00361a

Conversion of indoles to dihydroacridines^a.


Entry	Substrate	Product	Yield%
1	22, R¹ = R² = R³ = H	30, R¹ = R² = R³ = H	58
2	23, R¹ = R² = H, R³ = Me	31, R¹ = R² = H, R³ = Me	77
3	24, R¹ = R² = H, R³ = Et	32, R¹ = H, R² = R³ = Me	66
4	25, R¹ = H, R² = R³ = Me	32, R¹ = H, R² = R³ = Me	53
5	26, R¹ = R² = H, R³ = Ph	33, R¹ = R² = H, R³ = Ph	92
6	27, R¹ = R² = H, R³ = C₈H₁₇	34, R¹ = R² = H, R³ = C₈H₁₇	55
7	28, R¹ = R² = H, R³ = C₄H₉	35, R¹ = R² = H, R³ = C₄H₉	71
8	29, R¹ = 4-Me, R² = R³ = H	36, R¹ = 2-Me, R² = R³ = H	38

^a

Reactions were carried out neat (i.e. without added solvent).