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. Author manuscript; available in PMC: 2012 Jun 1.
Published in final edited form as: J Am Chem Soc. 2011 May 11;133(21):8150–8153. doi: 10.1021/ja2032635

Scheme 4. Completion of the Total Synthesis of 8,8′-epi-ent-Rostratin B (4)a.

Scheme 4

aReagents and conditions. a) O2, TPP (0.02 equiv), CH2Cl2, 400W Philips-MH400/U sunlamp, 0 °C, 2 h; then Et3N (5.0 equiv), 0→25 °C, 3 h, 55% for the two steps; b) [CuH(PPh3)]6 (10.0 equiv), benzene, 25 °C, 0.5 h; then aq. KI3 (1.4 M), 82%.