Abstract
Low-valent titanium and zirconium reagents in situ prepared from metallocene dichlorides (Cp 2MCl 2: M = Ti, Zr) and magnesium powder activated by 1,2-dibromoethane smoothly reacted with allyl propargyl ethers to afford 3-methylenetetrahydrofurans in good yields. It is noteworthy that the Cp 2Zr- and Cp 2Ti-mediated cyclizations proceed with inverse stereoselectivity.
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