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. Author manuscript; available in PMC: 2011 Dec 5.
Published in final edited form as: Tetrahedron. 2009 Apr 18;65(16):3096–3101. doi: 10.1016/j.tet.2008.08.055

Table 1.

Screen of acids for the interrupted Ugi reaction

graphic file with name nihms105783u1.jpg
Entry Acid Equivalents Yield %
1 None N.A. NR
2 HCl 1.0 50
3 Amberlyst-15 1.0 NR
4 HBF4•OEt2 1.0 86
5 Tf2NH 1.1 46
6 TfOH 1.1 62
7 TfOH 0.3 42
8 2 1.1 96
9 Sc(OTf)3 0.1 34