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A mixture of 2.6 g (0.04 mole) of zinc dust, 7.2 g (0.047 mole) of TiCl3, and 50 mL of DME was held at reflux for 2 h and cooled to room temperature. To this mixture was added 2.4 g (8.6 mmole) of 17 in 20 mL of DME in 10 min. The reaction mixture was stirred at room temperature for 2 h and held at reflux for 1 h then was let standing at room temperature over weekend. The reaction mixture was poured into dilute HCl and was stirred with methylene chloride. The methylene chloride-water mixture was filtered through Celite. The methylene chloride layer was washed with brine, dried over MgSO4, and concentrated in vacuo to give 3.0 g of residue. Purification by HPLC gave 0.41 g (20%) of 18 as an oil in the early fraction.

1. temperatureat reflux for 2 h
2. temperatureat reflux for 1 h
3. waitthen was let standing at room temperature over weekend
4. filtrationThe methylene chloride-water mixture was filtered through Celite
5. washThe methylene chloride layer was washed with brine
6. dry with materialdried over MgSO4
7. concentrationconcentrated in vacuo