[reaction: see text] Elusive nitroaceticacidesters and amides were obtained through a halogen exchange reaction of the corresponding bromoacetic acid derivatives with polymer-supported nitrite anion. The process is flawed by a side product catalyzed degradation of the products. Domino processes turned out to be a powerful tool for overcoming such drawbacks, converting a substandard reaction into
Organocatalytic Michael Addition of Nitro Esters to α,β-Unsaturated Aldehydes: Towards the Enantioselective Synthesis of<i>trans</i>-3-Substituted Proline Derivatives
作者:Man-Yi Han、Yong Zhang、Huai-Zhen Wang、Wan-Kai An、Bao-Chun Ma、Yuan Zhang、Wei Wang
DOI:10.1002/adsc.201200538
日期:2012.10.8
five-step strategy has been developed for the enantioselective synthesis of trans-3-substituted proline derivatives with high diasteroselectivity (dr>20:1) and enantioselectivity (up to 97% ee). The key step is the asymmetric organocatalyticMichaeladdition of nitro esters to α,β-unsaturatedaldehydes, which affords the chiral Michael adducts in high yields (up to 96%) and excellent enantioselectivity
The reaction of carbanions with 2-substituted-2-nitropropanes
作者:Glen A. Russell、Boguslaw Mudryk、Francisco Ros、Mikolaj Jawdosiuk
DOI:10.1016/0040-4020(82)80123-3
日期:1982.1
The reaction of mono-enolate anions with O2NCMe2X where X = Cl, NO2, p-MePhSO2 yield coupling (RCOCH(R′)(CMe2NO2) and enolate dimerization products (RCOCH(R′)CH(R′)COR) by free radical chain mechanisms involving bimolecular substitution or electrontransferreactions between the enolate anion and the intermediate nitro alkane radical anion (XCMe2NO2−).
单烯酸根阴离子与X = Cl,NO 2,p -MePhSO 2的O 2 NCMe 2 X反应产生偶联(RCOCH(R')(CMe 2 NO 2)和烯醇二聚产物(RCOCH(R')CH (R')COR)通过涉及烯醇阴离子和中间体硝基烷烃自由基阴离子之间的双分子取代或电子转移反应的自由基链机构(XCMe 2 NO 2 - )。
The synthesis of furoquinolinedione and isoxazoloquinolinedione derivatives as selective Tyrosyl-DNA phosphodiesterase 2 (TDP2) inhibitors
Based on our previous study on the development of the furoquinolinedione and isoxazoloquinolinedione TDP2 inhibitors, the further structure-activity relationship (SAR) was studied in this work. A series of furoquinolinedione and isoxazoloquinolinedione derivatives were synthesized and tested for enzyme inhibitions. Enzyme-based assays indicated that isoxazoloquinolinedione derivatives selectively showed
Enantioselective Copper(I/II)-Catalyzed Conjugate Addition of Nitro Esters to β,γ-Unsaturated α-Ketoesters
作者:Sheng Zhang、Kun Xu、Fengfeng Guo、Yanbin Hu、Zhenggen Zha、Zhiyong Wang
DOI:10.1002/chem.201303512
日期:2014.1.20
A highly enantioselective Michael addition of nitroacetates to β,γ‐unsaturatedα‐ketoesters was developed by using chiral copper catalysts. The Michael addition products can be obtained in high yields with up to 99 % ee. With these densely functionalized products, the chiral cyclic nitrones, which are important synthetic intermediates, can be obtained in one step.