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. 2011 Jul 8;7:951–959. doi: 10.3762/bjoc.7.106

Table 2.

Effect of N-substitutents.

graphic file with name Beilstein_J_Org_Chem-07-951-i002.jpg
entry R Au cat. (mol %) solvent temp. (°C) time (h) convn. (%)a yield of 5 (%)a
1 Ns (4b) 0.5 CH2Cl2 25 18 0 n. d.
2 Ns (4b) 2.5 DCE 80 18 100 76b
3 Cbz (4c) 2.5 DCE 80 24 97 33
4 Ac (4d) 2.5 DCE 80 24 63 18
5 Boc (4e) 2.5 DCE 80 24 17 n. d.
6 PMB (4f) 2.5 DCE 80 24 0 n. d.

aDetermined by 1H NMR. bIsolated yield.