[CH2:1]([C:3]([CH2:10][S:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=1[CH:18]=O)([CH:6]=[CH:7][CH2:8][CH3:9])[CH:4]=O)[CH3:2].Cl.C(Cl)Cl>COCCOC.[Zn]>[CH2:6]([C:3]1([CH2:1][CH3:2])[CH:4]=[CH:18][C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][C:12]=2[S:11][CH2:10]1)[CH2:7][CH2:8][CH3:9]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 a residue. Purification by HPLC gave 0.41 g (20%) of 18 as an oil in the early fraction.
불러오는 중…
