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Reductive radical cyclization of ketonitriles was catalyzed by Cp2TiCl2 in the presence of Me3SiCl, zinc powder and imidazole, giving the 2-amino-3-cyano-2-cyclopenten-1-ols in moderate to good yields with high trans selectivity (up to 94% trans). The influence of the catalyst, chlorosilane, co-reductant, solvent, and temperature on both the yield and diastereoselectivity of the cyclized products...
A catalytic cyclodimerization of arylidene malononitriles proceeded diastereoselectively with reversible redox between vanadium and zinc in the presence of chlorotrimethylsilane. The reductive coupling reaction strongly depended on the co-reductant, additive, solvent, and substrate.
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