On the rearrangement of N-aryl-N-Boc-phosphoramidates to N-Boc-protected o-aminoarylphosphonates
作者:Edyta Kuliszewska、Friedrich Hammerschmidt
DOI:10.1007/s00706-017-2058-x
日期:2018.1
phosphorus atom with its substituents from the nitrogen to the ortho-carbanionic carbon atom gave N-Boc-protected o-aminoarylphosphonates. The nature of the substituent of 3-substituted phenylphosphoramidates strongly influenced the regioselectivity of phosphonate formation. A crossover experiment with a deuterated phosphoramidate proved the intramolecular course of the rearrangement. Three representative
摘要各种芳胺分两步转化为N -Boc- N-芳基氨基磷酸酯。LiTMP 和 LDA在 -78 至 0 °C 的温度下诱导定向邻位金属化。随后磷原子及其取代基从氮迁移到邻碳负离子碳原子的[1,3]-迁移得到N -Boc-保护的邻氨基芳基膦酸酯。3-取代苯基磷酰胺的取代基性质强烈影响膦酸酯形成的区域选择性。使用氘代氨基磷酸酯的交叉实验证明了重排的分子内过程。三个代表N -Boc- o-氨基芳基膦酸酯被去保护以获得相应的邻氨基芳基膦酸。 图形概要