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. Author manuscript; available in PMC: 2009 Jul 22.
Published in final edited form as: Tetrahedron Lett. 2007 Jun 4;48(23):4047–4050. doi: 10.1016/j.tetlet.2007.04.021

Table 1.

Triflic acid catalyzed synthesis of N-phenylsulfonyl pyrrole, indole and carbazolea

graphic file with name nihms23907f3.jpg
Entry TfOH
(mole%)		 Yieldb(%)
a b c
1 3 85 0 0
2 5 98 0 0
3 50 40 60 0
4 100 5 95 0
5 200 0 30 70
6 300 0 15 85
7 325 0 11 89
8 350 0 8 92
a

Reaction conditions: sulfonamide (0.636 mmol), 2,5-dimethoxytetrahydrofuran (5 eqv.), RT, 2h.

b

Based on sulfonamide, determined by GCMS.