Cu-Catalyzed carbamoylation<i>versus</i>amination of quinoline<i>N</i>-oxide with formamides
作者:Yan Zhang、Shiwei Zhang、Guangxing Xu、Min Li、Chunlei Tang、Weizheng Fan
DOI:10.1039/c8ob02844c
日期:——
An efficient, direct carbamoylation and amination of quinoline N-oxides with formamides to access 2-carbamoyl and 2-amino quinolines has been developed throughcopper-catalyzed C–C and C–N bond formations via cross-dehydrogenative coupling reactions. The reaction proceeds smoothly over a broad range of substrates with excellent functional group tolerance under mild conditions. Mechanistic studies suggest
A general method for one-potsynthesis of thioamides without transition metals or external oxidants is developed through a three-component reaction involving chlorohydrocarbon, amide and elementalsulfur. Both alkyl and aryl thioamides could be obtained in moderate to excellent yields through this protocol. A high tolerance regarding various substituents on chlorohydrocarbon or amide was justified
Catalytic N-diphosphonomethylation of amino alkanols and bisamino alkanes using tris(trimethylsilyl) phosphite as a convenient synthon
作者:Andrey A. Prishchenko、Roman S. Alekseyev、Olga P. Novikova、Mikhail V. Livantsov、Ludmila I. Livantsova、Valery S. Petrosyan
DOI:10.1016/j.jorganchem.2021.122143
日期:2022.1
The new mono- and bis(aminomethylenediphosphonic) acids are synthesized for the first time via unique reaction of tris(trimethylsilyl) phosphite and various N-formyl amino alkanols or bis(N-formyl amino) alkanes at the presence of effective catalyst – trimethylsilyl triflate under mild conditions. The further treatment of initially formed trimethylsilyl intermediates with the methanol excess resulted
Reaction of bidentate isonitrile ligands with iron carbonyls
作者:James A. S. Howell、Anthony J. Rowan
DOI:10.1039/dt9810000297
日期:——
Reaction of the bidentate isonitriles CN(CH2)nNC (n= 2, 3, 4, or 6) with [Fe2(cp)2(CO)4](cp =η-cyclopentadienyl) yields exclusively [Fe2(cp)2(CO)3}2CN(CH2)nNC}] derivatives which are fluxional in solution and exist in three isomeric forms (bridged–bridged, bridged–terminal, and terminal–terminal with respect to the bonding mode of the bidentate isonitrile). The proportion of the isomers containing
Hydrolysis of Aliphatic
<i>Bis</i>
‐isonitriles in the Presence of a Polar Super Aryl‐Extended Calix[4]pyrrole Container
作者:Qingqing Sun、Luis Escobar、Pablo Ballester
DOI:10.1002/anie.202101499
日期:2021.4.26
We report binding studies of an octa‐pyridinium superaryl‐extendedcalix[4]pyrrole receptor with neutral difunctional aliphatic guests in water. The guests have terminal isonitrile and formamide groups, and the complexes display an inclusion binding geometry and 1:1 stoichiometry. Using 1H NMR titrations and ITC experiments, we characterized the dissimilar thermodynamic and kinetic properties of the
我们报告了八-吡啶超级芳基延伸的杯[4]吡咯受体与中性双官能脂肪族客体的结合研究。来宾具有末端异腈和甲酰胺基团,并且该络合物显示出夹杂物结合几何形状和1:1化学计量比。使用1 H NMR滴定和ITC实验,我们表征了配合物的不同热力学和动力学性质。所述双-isonitriles具有独立反应基团,然而,在1个当量水解反应产生非统计组成和反应速率的降低显著的混合物的受体的存在。对于双甲酰胺,单甲酰胺产品的选择性得到了特别提高。腈具有一个带有五个亚甲基的间隔基。动力学数据的分析表明,观察到的反应速率和选择性的改变与高度稳定的包合物的形成有关,在该包合物中,异腈被大量水分子所掩盖。通过与受体结合,显着降低本体溶液中反应底物的浓度。继而,结合的底物的异腈基团的水解速率比本体溶液中的水解速率慢。该受体既充当螯合基团,又充当超分子保护基团。