Synthesis of 1,3-Aminoalcohols and Spirocyclic Azetidines via Tandem Hydroxymethylation and Aminomethylation Reaction of β-Keto Phosphonates with <i>N</i>-Nosyl-<i>O</i>-(2-bromoethyl)hydroxylamine
作者:Binyu Wu、Hongbing Chen、Min Gao、Xiangnan Gong、Lin Hu
DOI:10.1021/acs.orglett.1c01091
日期:2021.6.4
α-aminomethylation reaction of aromatic cyclic β-keto phosphonates with N-nosyl-O-(2-bromoethyl)hydroxylamine in the presence of DBU base has been developed, affording a range of 1,3-aminoalcohols in good yields. The resultant products could be flexibly transformed into the spirocyclic and bispirocyclic azetidines via one step of Mitsunobu reaction. Mechanistic study revealed that hydroxylamine in situ generated
在 DBU 碱存在下,芳香环 β-酮膦酸酯与N - nosyl - O-(2-溴乙基)羟胺的前所未有的串联 α-羟甲基化和 α-氨基甲基化反应被开发出来,得到了一系列 1,3-氨基醇收益良好。所得产物可以通过Mitsunobu反应一步灵活地转化为螺环和双螺环氮杂环丁烷。机理研究表明,羟胺原位生成甲醛和诺磺酰胺,进而引发连续的 Horner-Wadsworth-Emmons、Michael 和 aldol 反应。