这里描述的是路易斯酸性硼烷催化剂介导的α,β-不饱和醛的还原胺化/氢化硅烷化级联。本反应系统提供了一种单罐合成路线,可通往其他先前催化无法达到的β-甲硅烷基化仲胺。对亚胺的甲硅烷基化还原进行的比较1 H NMR研究表明,伯胺反应物的空间体积极大地影响了催化效率和区域选择性。该策略适用于广泛的底物,并适用于一锅克级合成。此外,还发现非对映选择性地引入β-甲硅烷基是可行的(dr高达71:29)。
simplicity: Easily available imidazole-based substrates were coupled with β-aryl enals via eliminative [4+2] cycloaddition under mild aminocatalytic conditions to access rare chiral [d]-fused imidazole ringsystems with optimal enantio- and regioselectivity and good potential for post-cycloaddition functional group editing.
Silylative Reductive Amination of α,β-Unsaturated Aldehydes: A Convenient Synthetic Route to β-Silylated Secondary Amines
作者:Eunae Kim、Sehoon Park、Sukbok Chang
DOI:10.1002/chem.201800958
日期:2018.4.17
Described here is a reductive amination/hydrosilylation cascade of α,β‐unsaturated aldehydes mediated by a Lewisacidic borane catalyst. The present reaction system provides an one‐pot synthetic route towards β‐silylated secondary amines that have not been accessible by other previous catalysis. Comparative 1H NMR studies on the silylative reduction of enimines revealed that steric bulkiness of primary
这里描述的是路易斯酸性硼烷催化剂介导的α,β-不饱和醛的还原胺化/氢化硅烷化级联。本反应系统提供了一种单罐合成路线,可通往其他先前催化无法达到的β-甲硅烷基化仲胺。对亚胺的甲硅烷基化还原进行的比较1 H NMR研究表明,伯胺反应物的空间体积极大地影响了催化效率和区域选择性。该策略适用于广泛的底物,并适用于一锅克级合成。此外,还发现非对映选择性地引入β-甲硅烷基是可行的(dr高达71:29)。
Perfluorophenyl phosphonate analogues of aromatic amino acids: Synthesis, X-ray and DFT studies
Novel perfluorophenyl phosphonate analogues of phenylglycine and homophenylalanine were prepared in good to excellent yields, and subjected to solid state characterization by single-crystal X-ray diffraction analysis, and to investigations with the use of DFT methods. The α-aminophosphonates have a big potential for biological activity, and through SNAr reactions may give an entrance to further structurally
制备了苯甘氨酸和高苯丙氨酸的新型全氟苯基膦酸酯类似物,收率很高,并通过单晶X射线衍射分析进行了固态表征,并使用DFT方法进行了研究。 α-氨基膦酸酯具有很大的生物活性潜力,并且通过S N Ar反应可以为这两种氨基酸的进一步结构可变的类似物提供入口。