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. Author manuscript; available in PMC: 2011 Jul 12.
Published in final edited form as: Chemistry. 2010 Jul 12;16(26):7678–7682. doi: 10.1002/chem.201001474

Scheme 2.

Scheme 2

[2+2] Photocycloaddition series with 4-epi-hyperolactone C (5). Reagents and conditions: 5 (1.0 equiv), 3, 7, ent-7 and ent-3 (4.0 equiv), 2′-acetonaphthone (1.0 equiv), CH2Cl2, 320 nm, 5 °C, 12 h; 52 % yield (6); 37 % yield (8); 39 % yield (9); 44 % yield (10).