Use of the Mitsunobu reaction in the synthesis of orthogonally protected α,β-diaminopropionic acids
作者:Fintan Kelleher、Keith ó Proinsias
DOI:10.1016/j.tetlet.2007.05.064
日期:2007.7
Orthogonally protected α,β-diaminopropionic acids have been synthesised in good yields by the reaction of N-trityl l-serine esters with N-substituted sulfonamides under Mitsunobu reaction conditions (DEAD, PPh3, THF). The best isolated yields were obtained when N-Boc p-toluenesulfonamide was used as the nitrogen nucleophile precursor in the Mitsunobu reaction. Subsequently, the N-trityl group was efficiently
通过在Mitsunobu反应条件下(DEAD,PPh 3,THF)使N-三苯甲基1-丝氨酸酯与N-取代的磺酰胺反应,以高收率合成了正交保护的α,β-二氨基丙酸。当将N -Boc对甲苯磺酰胺用作Mitsunobu反应中的氮亲核试剂前体时,可获得最佳的分离产率。随后,将N-三苯甲基有效地替换为更稳定的烯丙氧羰基(alloc)基团。