WANG Zhou, MA Yinhui, QIN Lulu, MAO Yuhong, WANG Wei*
College of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi′an 710119, Shaanxi,China)
Abstract:
In the process of the synthesis of (4R)Benzyloxy(2S)proline from NBoc(4R)Hydroxy(L)Proline methyl ester by Williamson reaction and after removing the BOC group, it was found that the part racemization of the chiral carbon atom C2 could occur in case of NaH used as a basic reagent, resulting in simultaneous formation of (4R)Benzyloxy(2S)proline and diastereoisomer (4R)Benzyloxy(2R)proline in one pot. The target compounds are characterized by 1H NMR, 13C NMR, HRMS, IR, specific rotation and melting point.Based on this research, a simple, effective and reliable method for the synthesis of Dproline derivatives could be constructed.
KeyWords:
synthesis; diastereoisomers; proline derivatives