新型的氮杂双环2-异恶唑啉,4,5-二氢异恶唑[5,4- b ]吡咯烷和4,5-二氢异恶唑[5,4- b ]哌啶以高度区域选择性的方式通过1,3-偶极合成5元和6元环内氨基甲酸酯和酰胺与几种腈氧化物的环加成反应,收率良好或优异。5元和6元Cbz-环加合物的氢解反应生成仲胺,具有独特的稳定性。通过N-苯甲酰化,然后仲胺的氨解,或直接从环加合物的氨解,以高收率获得了2-异恶唑啉双酰胺。
An activated carbon with OSGs (Oxygen Surface Groups) supported nickel catalyst shows high activity and chemoselectivity for hydrogenation of a variety of substituted nitroarenes under mild reaction conditions.
Deprotection Chemistry Mediated by ZrOCl<sub>2</sub> · 8H<sub>2</sub>O: An Efficient, Mild, and Green Method for the Conversion of Oximes to Carbonyl Compounds in Aqueous Acetone
Abstract Less-toxic, moisture-stable, inexpensive, and ecofriendly zirconium oxychloride octahydrate (ZrOCl2 · 8H2O) in aqueous acetone (1:1) mediates the conversion of oximes to carbonyl compounds in moderate to good yields. This green methodology is applicable to both aldoximes and ketoximes with tolerance to >C˭C<, -NO2, -OH, and -Cl groups. The reaction and workup are simple.
Homologation of arylaldehydes provides useful synthetic intermediates, but it requires multistep reactions and generates significant amounts of waste. We considered such reactions using nitromethane as a C1 source through nitroolefin formation, partial hydrogenation to oximes, and hydration of oximes; however, the control of selectivity in the second reaction is challenging. To achieve this pathway