There is described the use of a protic ionic liquid comprising a trialkylammonium salt as a solvent.
这里描述了一种包含三烷基铵盐的质子离子液体作为溶剂的使用。
Cyanohydridoborate anion as a selective reducing agent
作者:Richard F. Borch、Mark D. Bernstein、H. Dupont Durst
DOI:10.1021/ja00741a013
日期:1971.6
amines under acid catalysis. Reaction of a n aldehyde or ketone with ammonia, primary amine, or secondary amine a t p H -7 in the presence of BHaCNleads t o primary, secondary, or tertiary amines, respectively, uia reductive amination of the carbonyl group. Reaction of substituted pyruvic acids with ammonia and BH3CNaffords an excellent method for the synthesis of amino acids; l5N labeling can be accomplished
氰基氢化硼酸钠 (NaBH3CN) 以显着的选择性还原各种有机官能团。醛和酮的还原依赖于 pH,反应在 pH 3-4 下很容易进行。在酸催化下,肟 a 顺利还原为烷基羟胺,烯胺还原为胺。在 BHaCN 存在下,醛或酮与氨、伯胺或仲胺在 H -7 处的反应分别导致伯胺、仲胺或叔胺,以及羰基的还原胺化。取代丙酮酸与氨和 BH3CN 的反应提供了一种合成氨基酸的极好方法;15N 标记可以通过使用 I5NH3 来完成。BHICN 的氢可以很容易地交换为氘或氚,因此允许合成氘或氚标记的醇、胺和氨基酸。早期发现氰基氢硼酸锂的还原能力 4 和酸稳定性 5 ,并致力于研究改性硼氢化物作为有机官能团的选择性还原剂 。2.3 2127 (1962);(c) R. 保罗和 N。约瑟夫,布尔。SOC。化学 神父,550 (1952);(d) HC Brown 和 EJ Mead, J。阿米尔。化学 SOC., 75
N-Methylation of amines and nitroarenes with methanol using heterogeneous platinum catalysts
作者:Md.A.R. Jamil、Abeda S. Touchy、Md. Nurnobi Rashed、Kah Wei Ting、S.M.A. Hakim Siddiki、Takashi Toyao、Zen Maeno、Ken-ichi Shimizu
DOI:10.1016/j.jcat.2019.01.027
日期:2019.3
We report herein the selective N-methylation of amines and nitroarenes with methanol under basic conditions using carbon-supported Pt nanoparticles (Pt/C) as a heterogeneous catalyst. This method is widely applicable to four types of N-methylation reactions: (1) N,N-dimethylation of aliphatic amines under N2, (2) N-monomethylation of aliphatic amines under 40 bar H2, (3) N-monomethylation of aromatic
我们在此报告了在碱性条件下使用碳载Pt纳米颗粒(Pt / C)作为非均相催化剂,用甲醇对胺和硝基芳烃进行选择性N-甲基化的过程。该方法广泛适用于四种类型的Ñ -methylation反应:(1)N,N-氮气氛下脂族胺的-dimethylation 2,(2)Ñ -monomethylation下40巴脂族胺为h 2,(3)ñ -monomethylation N 2下的芳香胺的合成;(4)在2 bar H 2下由硝基芳烃和甲醇串联合成N-甲基苯胺。在相同的催化系统下,所有这些反应均显示出适用于多种底物的相应甲胺的收率高,周转率高(TON)和良好的催化剂可重复使用性。机理研究表明,反应是通过借用氢的方法进行的。动力学结果结合密度泛函理论(DFT)计算表明,Pt / C的高性能归因于Pt中等的金属-氢键强度。
Cyclic Polyolefins. I. Synthesis of Cycloöctatetraene from Pseudopelletierine<sup>1</sup>
作者:Arthur C. Cope、C. G. Overberger
DOI:10.1021/ja01184a041
日期:1948.4
This paper presents data amplifying our recent communication3 which reported duplication of the Willstatter synthesis of cyclooctatetraene from p~eudopelletierine.'~~ Indirect evidence of three kinds had been interpreted as indicating that the Willstatter product might not have been 1,3,5,7cyclooctatetraene6 : Similarity of the product to styrene ; the fact that catalytic dehydrogenation of cyclooctene
Efficient and Versatile Catalytic Systems for the N-Methylation of Primary Amines with Methanol Catalyzed by N-Heterocyclic Carbene Complexes of Iridium
作者:Ken-ichi Fujita、Genki Toyooka、Akiko Tuji
DOI:10.1055/s-0037-1610252
日期:2018.12
an appropriate catalyst). These findings can be used to develop methods for synthesizing useful amine compounds having N-methyl or N,N-dimethyl moieties. Efficient and versatile catalytic systems were developed for the N-methylation of both aliphatic and aromatic primary amines using methanol as the methylating agent. Iridium complexes bearing an N-heterocyclic carbene (NHC) ligand exhibited high catalytic