Stereoselective synthesis of α-difluoromethyl-β-amino alcohols via nucleophilic difluoromethylation with Me3SiCF2SO2Ph
作者:Jun Liu、Chuanfa Ni、Fang Wang、Jinbo Hu
DOI:10.1016/j.tetlet.2008.01.034
日期:2008.3
A facile synthesis of anti-α-(difluoromethyl)-β-amino alcohols was accomplished by using a nucleophilic difluoromethylation strategy with Me3SiCF2SO2Ph reagent. Good to excellent chemical yields as well as modest to good diastereoselectivity were achieved in these reactions. We found that the solvent played a crucial role in controlling the diastereoselectivity of the reaction, and an apolar solvent
通过使用亲核性二氟甲基化策略和Me 3 SiCF 2 SO 2 Ph试剂,可以轻松合成抗-α-(二氟甲基)-β-氨基醇。在这些反应中,获得了良好至优异的化学产率以及适度至良好的非对映选择性。我们发现溶剂在控制反应的非对映选择性中起关键作用,而非极性溶剂(如甲苯)有助于改善反应的非对映选择性。的抗-α-(二氟甲基)-β-氨基醇3A被证明是中间以合成有用的合成difluoromethylated恶唑烷酮9。
<i>A</i>- and<i>B</i>-fluorinated aminophosphonates–Synthesis and properties
GRAPHICAL ABSTRACT ABSTRACT Interest in synthesis of fluorinated aminophosphonates has grown significantly in recent years due to their promising applications in medicinal and bioorganic chemistry. We report herein efficient and general methods for the synthesis of α- and β-monofluorinated aminophosphonates. Series of β-fluoro aminophosphonates were prepared in nucleophilic DAST-mediated fluorination