Direct biocatalysed synthesis of first sulfur-, selenium- and tellurium- containing <scp>l</scp>-ascorbyl hybrid derivatives with radical trapping and GPx-like properties
作者:Damiano Tanini、Beatrice Lupori、Gianni Malevolti、Moira Ambrosi、Pierandrea Lo Nostro、Antonella Capperucci
DOI:10.1039/c9cc02427a
日期:——
6-O-l-Ascorbyl selenoesters, thioesters and telluroesters can be efficiently and directly prepared from l-ascorbic acid and suitable functionalised chalcogenoesters through lipase-catalysed transesterification reactions.
Concerted<i>vs.</i>Non-Concerted 1,3-Dipolar Cycloadditions of Azomethine Ylides to Electron-Deficient Dialkyl 2,3-Dicyanobut-2-enedioates
作者:Alexander F. Khlebnikov、Alexander S. Konev、Alexander A. Virtsev、Dmitry S. Yufit、Grzegorz Mlostoń、Heinz Heimgartner
DOI:10.1002/hlca.201300405
日期:2014.4
3‐triphenylaziridine with formation of the corresponding azomethine ylides of S‐, U‐, and W‐type as well as their cycloaddition to dimethyl acetylenedicarboxylate (DMAD) and dimethyl 2,3‐dicyanobut‐2‐enedioate, were performed at the DFT B3LYP/6‐31G(d) level of theory with the PCM solvation model. The calculations are in complete accordance with experimental results and explain the switch from the concerted to
Targeted synthesis of 2,3-dicyano-2-(2-oxoalkyl)succinates
作者:M. Yu. Ievlev、K. V. Lipin、O. V. Ershov、V. A. Tafeenko、O. E. Nasakin
DOI:10.1134/s1070428014050224
日期:2014.5
Unexpected Reaction Course of 3-Amino-5-aryl-1<i>H</i>-pyrazoles with Dialkyl Dicyanofumarates
作者:Korany A. Ali、Eman A. Ragab、Grzegorz Mlostoń、Małgorzata Celeda、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.201200633
日期:2013.4
On treatment of 3‐amino‐5‐aryl‐1H‐pyrazoles 1 with dialkyldicyanofumarates (=(E)‐but‐2‐enedioates) 4 in boiling 1,2‐dichloroethane, two competitive reactions occurred leading to 3‐aryl‐5‐cyano‐6,7‐dihydro‐6‐oxo‐1H‐pyrazolo[3,4‐b]pyridine‐4‐carboxylates 10 and 7‐amino‐2‐arylpyrazolo[1,5‐a]pyrimidine‐5,6‐dicarboxylates 11. In DMF at room temperature, as well as at 100°, only compounds 10 were isolated
在沸腾的1,2-二氯乙烷中用二氰基富马酸二烷基酯(=(E)-但是-2-烯二酸酯)4处理3-氨基-5-芳基-1 H-吡唑1时,发生了两个竞争反应,导致3-芳基- 5-氰基-6,7-二氢-6-氧代-1 H-吡唑并[3,4- b ]吡啶-4-羧酸酯10和7-氨基-2-芳基吡唑并[1,5 - a ]嘧啶-5, 6-二羧酸盐11。在室温以及100°C的DMF中,仅分离出化合物10。类型10的主要产品的形成通过将迈克尔加成1来合理化将C(4)-亲核试剂吸附到4上,然后消除HCN和内酰胺化。另一方面,次要产物11是通过经由NH 2基团在1至4上的迈克尔加成以及随后的HCN消除和环化而产生的。产品的结构已通过X射线晶体学确定。
Design and Synthesis of a Library of Molecule-Based Magnets: The Charge-Transfer Salt Approach
作者:Bharat B. Kaul、Bruce C. Noll、Gordon T. Yee
DOI:10.1006/jssc.2001.9174
日期:2001.7
The rules governing magnetic coupling in molecule-based materials are still being defined. Until they are clear, synthetic efforts should ideally yield many new candidate magnets for a minimal investment of time and effort. One approach that satisfies this requirement is the synthesis of magnetic charge-transfersalts from metallocenes and easily identifiable organic acceptors. This strategy offers