Stereoselective reduction and reductive dephosphonylation of β-iminophosphonates
作者:Mohamed Amedjkouh、Jacques Grimaldi
DOI:10.1016/s0040-4039(02)00521-x
日期:2002.5
Proline-like 2,4-dialkyl-5-phosphonylpyrrolidines 2 were obtained stereoselectively by reduction of the corresponding beta-iminophosphonates 1 with NaBH4. The detailed characterization of compounds 2 was accomplished by H-1 and C-13 NMR as well as by crystal structure analysis. When 1 was reduced with LiAlH4 the reaction gave dephosphonylated pyrrolidines 3. The latter method is suitable for providing substituted pyrrolidines regioselectively. A possible mechanism for the dephosphonylation is proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.