A Practical and General Base-Catalyzed Carbonylation of Amines for the Synthesis of<i>N</i>-Formamides
作者:Wanfang Li、Xiao-Feng Wu
DOI:10.1002/chem.201502107
日期:2015.10.12
A highly practical and general base‐catalyzed carbonylation of amines to the corresponding N‐formamides has been realized. Cheap inorganic bases, including Group IA and IIA metal hydroxides, alkoxides, carbonates, and phosphates, were effective catalysts for the transformation. In the presence of 10–40 mol % of KOH or K2CO3, various amines were converted into the corresponding N‐formamides in good‐to‐excellent
已经实现了一种高度实用且通用的碱催化的胺羰基化为相应的N-甲酰胺的方法。廉价的无机碱,包括IA和IIA组金属氢氧化物,醇盐,碳酸盐和磷酸盐,是转化的有效催化剂。在存在10–40 mol%的KOH或K 2 CO 3的情况下,使用CO作为甲酰化试剂,可以将各种胺以良好或优异的产率转化为相应的N-甲酰胺。
Organocatalytic Decarboxylation of Amino Acids as a Route to Bio‐based Amines and Amides
作者:Laurens Claes、Michiel Janssen、Dirk E. De Vos
DOI:10.1002/cctc.201900800
日期:2019.9.5
Amino acids obtained by fermentation or recovered from protein waste hydrolysates represent an excellent renewable resource for the production of bio‐based chemicals. In an attempt to recycle both carbon and nitrogen, we report here on a chemocatalytic, metal‐free approach for decarboxylation of amino acids, thereby providing a direct access to primary amines. In the presence of a carbonyl compound
A more sustainable and highly practicable synthesis of aliphatic isocyanides
作者:K. A. Waibel、R. Nickisch、N. Möhl、R. Seim、M. A. R. Meier
DOI:10.1039/c9gc04070f
日期:——
A more sustainable and easier applicable synthesis of aliphatic isocyanides in DMC is introduced using non-hazardousp-toluenesulfonyl chloride as dehydration reagent.
Stereoselective Aldol Additions of Achiral Ethyl Ketone-Derived Trichlorosilyl Enolates
作者:Scott E. Denmark、Son M. Pham
DOI:10.1021/jo034092x
日期:2003.6.1
ethyl ketoneenolates have been developed. The addition of enoxy(trichlorosilanes) (trichlorosilylenolates) to aldehydes proceeds with good yields in the presence of catalytic amounts of chiral phosphoramides. The reaction of Z-trichlorosilyl enolates to aryl aldehydes affords aldol products with good to excellent diastereo- and enantioselectivities. Phosphoramide-catalyzed aldoladditions lacked
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。