[HCo(CO)<sub>4</sub>]-Catalyzed Three-component Cycloaddition of Epoxides, Imines, and Carbon Monoxide: Facile Construction of 1,3-Oxazinan-4-ones
作者:Lixia Liu、Huailin Sun
DOI:10.1002/anie.201403998
日期:2014.9.8
The three‐component [3+2+1] cycloaddition of epoxides, imines, and carbon monoxide to produce 1,3‐oxazinan‐4‐ones has been developed by using [HCo(CO)4] as the catalyst. The reaction occurs for a wide variety of imines and epoxides, under 60 bar of CO pressure at 50 °C, to produce 1,3‐oxazinan‐4‐ones with different substitution patterns in high yields, and provides an efficient and atom‐economic route
通过使用[HCo(CO)4 ]作为催化剂,开发了环氧化物,亚胺和一氧化碳的三组分[3 + 2 + 1]环加成反应,生成1,3-恶二嗪-4-酮。反应发生在50°C的60 bar CO压力下的各种亚胺和环氧化物上,可高产率地生产具有不同取代方式的1,3-氧杂嗪酮-4-酮,并提供了高效且原子经济的从简单易用的起始原料过渡到杂环的方法。可能的机理涉及[HCo(CO)4 ]引起的环氧化物开环,然后依次添加一氧化碳和亚胺,然后闭环形成产物,并伴随[HCo(CO)4 ]的再生。
CO<sub>2</sub> Incorporation Reaction Using Arynes: Straightforward Access to Benzoxazinone
A zwitterion, generated from an aryne and an imine, has been demonstrated to serve as an excellent molecular scaffold for capturing CO2, which results in the straightforward formation of diverse benzoxazinones.
Efficient Synthesis of New 4-Arylideneimidazolin-5-ones Related to the GFP Chromophore by 2+3 Cyclocondensation of Arylideneimines with Imidate Ylides
作者:Janusz Kowalik、Anthony Baldridge、Laren Tolbert
DOI:10.1055/s-0029-1218796
日期:2010.7
A 2+3 condensation of a wide assortment of Schiff bases, prepared from aromatic aldehydes and primary amines, with methyl 2-(1-ethoxyethylideneamino)acetate allows convenient access to an extensive family of substituted 4-arylideneimidazolin-5-one analogues of the green fluorescent protein (GFP) chromophore. 4-arylideneimidazolin-5-one - azomethine ylide - Schiff bases - heterocycle - 2+3 cycloaddition
with different amine moieties, peculiar of σ2R ligands. Most of the new ligands exhibited a pan-affinity towards both σR subtypes and high affinity against GluN2b subunit. The most promising compounds belong to the dihydroquinolinone series, with the best affinity profile for the cyclohexylpiperazine derivative 28. Investigation on their biological activity showed that the newcompounds were able to