Scheme 3.
Comparison of the reactivity of C-2 substituted indoles 1j and 1k. Conditions: a) (Ph3P)AuCl/AgSbF6 (5 mol %), CH2Cl2, rt; b) [(2,4-(t-Bu)2C6H3O)3P]AuCl/AgOTf (5 mol %), toluene, 0 °C.
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