Synthesis of Electron-Deficient N1-(Hetero)aryl 3,3,5,5-Tetramethyl Piperazinones
作者:Stephen Stokes、Thomas Alanine、James Scott
DOI:10.1055/s-0036-1588903
日期:——
An alternative synthesis of N 1-(hetero)aryl 3,3,5,5-tetrasubstituted piperazin-2-ones is demonstrated using a copper-mediated Goldberg arylation of a common intermediate in good to fair yields. An improved synthesis of 3,3,5,5-tetramethyl piperazin-2-one is also described. This method allows for the synthesis of substituted piperazin-2-ones which are challenging or inaccessible using traditional Bargellini
N 1-(杂)芳基3,3,5,5-四取代哌嗪-2-酮的替代合成使用铜介导的普通中间体的Goldberg芳基化以良好到公平的产率进行证明。还描述了 3,3,5,5-四甲基哌嗪-2-one 的改进合成。这种方法允许使用传统的 Bargellini 化学合成具有挑战性或无法获得的取代哌嗪-2-酮。
Palladium-Catalyzed Enantioselective C–H Activation of Aliphatic Amines Using Chiral Anionic BINOL-Phosphoric Acid Ligands
作者:Adam P. Smalley、James D. Cuthbertson、Matthew J. Gaunt
DOI:10.1021/jacs.6b12234
日期:2017.2.1
design of an enantioselective Pd(II)-catalyzed C-H amination reaction is described. The use of a chiral BINOL phosphoric acid ligand enables the conversion of readily available amines into synthetically valuable aziridines in high enantiomeric ratios. The aziridines can be derivatized to afford a range of chiral amine building blocks incorporating motifs readily encountered in pharmaceutically relevant
Several novel syntheses have been discovered for preparation of 2-keto-1,4- diazacycloalkanes and their derivatives. Trans isomers of polysubstituted quinoxalin-2- ones may now be prepared.
This invention pertains to the polyurethane composition with hydrophilicity and hydrolysis resistance. The purpose of this invention is achieved by:
1) A polyurethane molecule containing at least one acidic hydrophilic group in the molecule is neutralized with piperidine derivatives or piperazinone derivatives, or
2) A mixture containing polyurethane and compound(s) having at least one acidic hydrophilic group is neutralized with piperidine derivatives or piperazinone derivatives.
The invention polyurethane compositions which have excellent hydrolysis resistance and rupture strength are useful for adhesives, paints, and binding agents for magnetic recording media.