Scheme 3.
Olefination reactions of 15 and the X-ray structure of 17 (CCDC number 1432194): i. Zn, TiCl4, THF, 0 °C to reflux, 12 h; ii. Pd/C, H2, EtOAc, 20 °C, 16 h, 76% over 2 steps. iii. Zn, CH2I2, TiCl4, THF, 0 °C to 20 °C, 12 h; 79%.
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