Synthesis of Conformationally Restricted and Optically Pure Analogues of Serine-Proline Dipeptide via Aldol Condensation - Bravin, Fabio Massimo; Busnelli, Gilberto; Colombo, Matteo; Gatti, Francesco; Manzoni, Leonardo; Scolastico, Carlo; Bravin, F M; Busnelli, G; Colombo, M; Gatti, F; Manzoni, L; Scolastico, C (Synthesis, 2004)