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Asymmetric synthesis of α-methylene bis-γ-butyrolactone has been synthesized using titanocene(III) chloride as a radical source. Titanocene(III) chloride (Cp 2 TiCl) was prepared in situ from commercially available titanocene dichloride (Cp 2 TiCl 2 ) and zinc dust in THF.
A convenient enantioselective synthesis of 3-asymmetrically substituted oxindoles is reported. Compound (2) prepared by radical cyclisation of (1) was used for the synthesis of racemic and enantiomerically pure 3-asymmetrically substituted oxindoles. Desulfurisation of (2) using Raney Ni yielded the racemate (5). Addition of (S)-1-phenylethanol to compound (2) yielded the diastereoisomer (21) the...
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