Synthesis of benzimidazoles and quinoxalin-2(1H)-ones^a.

Entry	1, R1, R2	6, R6	7, yield (%)	8, yield (%)
1	1a, H, Bn	6a, Bn	7a, 9	8a, 76
2	1a, H, Bn	6b, t-Bu	7b, 11	8b, 73
3	1c, F, Bn	6b, t-Bu	7c, 12	8c, 71
4	1b, Me, Bn	6b, t-Bu	7d, 79	Trace
5	1d, H, Me	6a, Bn	7e, 69	Trace
6	1d, H, Me	6b, t-Bu	7f, 71	0
7	1e, Me, Me	6b, t-Bu	7h, 73	0
8	1f, F, Me	6b, t-Bu	7i, 59	0

^aReaction conditions: a mixture of 1 (0.6 mmol), 6 (0.6 mmol) and CF₃COOH (0.6 mmol) in MeCN (2.0 mmol) while stirring in open flask at room temperature.