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. Author manuscript; available in PMC: 2009 Dec 15.
Published in final edited form as: Bioorg Med Chem. 2008 Nov 1;16(24):10270–10280. doi: 10.1016/j.bmc.2008.10.048

Table 2.

Yields for converting 4–6.

Compound Yield Compound Yield Compound Yield Compound Yield
6a 65 6e 60 6i 62 6m 53
6b 17a 6f 67 6j 60 6n 65
6c 25a 6g 37 6k 50 6o 51
6d 69 6h 58 6l 68
a

DMF at 100 °C; the others involved THF at rt.