SEARCH Articles Figures Tables Indole N-oxides Indoles N-methylation N Boc indoles N acetyl indoles N- indole N- indole N-Acyl indoles N-Phenylsulfonyl indole N-Pivaloyl-2- indole N-Protected indole N-Substituted indole Tri-n-butylphosphine catalysis 3-(2-methyl-2-nitropropyl)indole