A biocatalyticapproach towards a range of 4‐aryloxazolidinones is developed using a halohydrin dehalogenase from Ilumatobacter coccineus (HheG) as biocatalyst. The method is based on the HheG‐catalyzed α‐position regioselective ring‐opening of styrene oxide derivatives with cyanate as a nucleophile, producing the corresponding 4‐aryloxazolidinones in moderate to good yields. Synthesis of enantiopure
enantio‐ and regioselective ring‐opening of styrene oxides with cyanate was developed by using the halohydrin dehalogenase HheC from Agrobacterium radiobacter AD1, generating the corresponding chiral 5‐aryl‐2‐oxazolidinones in up to 47% yield and 90% ee. Additionally, the origin of enantioselectivity and regioselectivity of the HheC‐catalyzed cyanate‐mediatedring‐opening process was uncovered by single
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-catalyzed metal-free hydrogenation of 2-oxazolones
作者:Guangyu Cui、Xiangqing Feng、Haifeng Du
DOI:10.1039/d2ob01950g
日期:——
A metal-free hydrogenation of 2-oxazolones was successfully realized by using 10 mol% of B(C6F5)3 as the catalyst, giving a variety of 2-oxazolidinones in 70–98% yields. An enamine to imine process was believed to be involved in this reaction.
以10 mol%的B(C 6 F 5 ) 3为催化剂,成功实现了2-恶唑酮的无金属加氢反应,得到多种2-恶唑烷酮,收率为70-98%。烯胺到亚胺的过程被认为参与了该反应。
Synthesis of Chiral 2‐Oxazolidinones by Ruthenium‐Catalyzed Asymmetric Transfer Hydrogenation of 2‐Oxazolones
An asymmetric transfer hydrogenation of 2-oxazolones in the presence of a chiral diamine ruthenium catalyst with potassium formate as a hydrogen source and potassium carbonate as an additive in 2,2,2-trifluoroethanol is described. A series of chiral 2-oxazolidinones were obtained with 29%–95% yields and 86%–>99% ee's. Furthermore, gram-scale synthesis of chiral 2-oxazolidinone and its downstream derivatizations