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. Author manuscript; available in PMC: 2012 Apr 15.
Published in final edited form as: J Org Chem. 2011 Mar 14;76(8):2913–2919. doi: 10.1021/jo200101q

Table 3.

Variation at R3, R4, and R5

graphic file with name nihms280785u4.jpg
entry R3 R4 R5 T (h) 11 yield (%)
1 p-MeO-C6H4 H CO2Et 10 a 45
2 Ph H CO2Et 12 b 42
3 Ph Me CO2Et 12 c 59
4 p-NO2-C6H4 H CO2Et 6 d 40a
5 PhCH=CH H CO2Et 20 e 41
6 n-C6H13 H CO2Et 12 f 40
7 Ph H COPh 12 g 41
8 Ph Bn H 12 h 40a
9 Ph H H 12 i 0
a

The compound was synthesized as a 2:1 mixture of regioisomers