N- and C-protected derivatives of 2,5-disubstituted trans- and cis-THF aminoacids 6 and 7 were prepared in enantiomericallypure form from L-alanine. Felkin–Anh-controlled reduction of the ketone 9 was achieved with a 85:15 diastereoselectivity. Epoxidation of 10 and subsequent intramolecular epoxide opening gave the trans- and cis-THF alcohols 11 and 12, which were further transformed into the corresponding