1. Rodrı́guez, A. D. Tetrahedron 1995, 51, 4571–4618 and references cited therein.
2. Rodrı́guez, A. D.; Ramı́rez, C.; Rodrı́guez, I. I.; Barnes, C. L. J. Org. Chem. 2000, 65, 1390–1398.
3. Rodrı́guez, A. D.; Ramı́rez, C.; Rodrı́guez, I. I. Tetrahedron Lett. 1999, 40, 7627–7631.
4. For elisabetholide (3): a yellowish oil; [α]25D +21.9 (c 2.0, CHCl3); IR (neat) 3500–3300, 2963, 2925, 2853, 1740, 1720, 1466, 1377, 1261, 1183, 1141, 972, 795 cm−1; EIMS m/z [M]+ 392 (7), 374 (1), 347 (17), 275 (24), 247 (31), 237 (100), 219 (24), 205 (34), 163 (36), 109 (65); HREIMS m/z [M]+ 392.2184 (calcd for C22H32O6, 392.2199).
5. The program Insight II (version 98.0) was employed for the molecular modeling studies.