通过可见光光氧化还原催化的催化脱氢(CD)为芳香族化合物的合成提供了一条有效的途径。然而,由于在光催化条件下难以控制胺的反应性,通过可见光诱导的环糊精来获得广泛使用的合成部分的N-芳基胺仍然是一个重大挑战。在这里,可见光诱导光催化合成N-芳基胺是通过烯丙胺的CD实现的。使用C 6 F 5 I作为氢原子受体的不寻常策略使得带有各种官能团和活化C-H键的胺能够温和且受控的CD,从而抑制反应性N-芳基胺产物的副反应。彻底的机理研究表明,单电子和氢原子转移以明确的顺序参与,以在控制反应性方面提供协同效应。值得注意的是,反电子转移过程可防止所需产物在氧化条件下进一步反应。
Robust Buchwald–Hartwig amination enabled by ball-milling
作者:Qun Cao、William I. Nicholson、Andrew C. Jones、Duncan L. Browne
DOI:10.1039/c8ob01781f
日期:——
An operationally simple mechanochemical method for the Pd catalysed Buchwald–Hartwig amination of arylhalides with secondary amines has been developed using a Pd PEPPSI catalyst system.
We have demonstrated that the unsupported nanoporous gold (AuNPore) was a green and highlyefficient heterogeneous catalyst for the reduction of amides to aminesusinghydrosilanes as reductants. A variety of tertiary amides with a broad functional groups were reduced to the corresponding tertiary amines in the presence of 2 mol% of AuNPore and PheMe2SiH or (Me2SiH)2O under mild conditions. AuNPore
benzyne intermediate accompanied with a proton transfer process, followed by an oxidative cyclization of the generated diphenylamine to furnish the corresponding carbazole products. A facile and efficient process for the preparation of various tertiary aminobenzenes and carbazole derivatives via photoinduced cross-coupling of amines with 1,2-diiodobenzene is reported. Mechanistic investigations indicate
METHOD FOR PRODUCING GLUCOSE BY ENZYMATIC HYDROLYSIS OF CELLULOSE THAT IS OBTAINED FROM MATERIAL CONTAINING LIGNO-CELLULOSE USING AN IONIC LIQUID THAT COMPRISES A POLYATOMIC ANION
申请人:Balensiefer Tim
公开号:US20100081798A1
公开(公告)日:2010-04-01
The present invention relates to a process for preparing glucose from a lignocellulose-comprising starting material, in which this is firstly treated with an ionic liquid and subsequently subjected to an enzymatic hydrolysis. The invention further relates to a process for preparing microbial metabolites, especially ethanol, in which the glucose obtained is additionally subjected to a fermentation.
Copper-Catalyzed Electrophilic Amination of Organoaluminum Nucleophiles with <i>O</i>-Benzoyl Hydroxylamines
作者:Shuangliu Zhou、Zhiyong Yang、Xu Chen、Yimei Li、Lijun Zhang、Hong Fang、Wei Wang、Xiancui Zhu、Shaowu Wang
DOI:10.1021/acs.joc.5b00767
日期:2015.6.19
A copper-catalyzed electrophilic amination of aryl and heteroaryl aluminums with N,N-dialkyl-O-benzoyl hydroxylamines that affords the corresponding anilines in good yields has been developed. The catalytic reaction proceeds very smoothly under mild conditions and exhibits good substrate scope. Moreover, the developed catalytic system is also well suited for heteroaryl aluminum nucleophiles, providing