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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Bioorg Med Chem Lett. 2009 Nov 14;20(1):83–86. doi: 10.1016/j.bmcl.2009.11.036

Scheme 2.

Scheme 2

Reagents and conditions: 3·2HCl, 7e-h, H2O/EtOH, Na2CO3, 1 d, 23 °C: products 4e (86%), 4f (70%), 4g (85%), and 4h (60%). 5, 7a′ or 7b′, Sc(OTf)3, EtOH, 23 °C, 1 d: products 6a′ (21%) or 6b′ (22%); 5, 7c′-h, EtOH, 23 °C, 1 d: products 6c′ (32%), 6d (40%), 6e (63%), 6f (51%), 6g (36%), 6h (38%).