i -Pr-pybox-diPh 2b或s -Bu-pybox-diPh 2c的铜(I)络合物已有效催化了在末端炔烃存在下一锅三醛的醛和胺偶联反应。该方法是简单的并且允许以良好至优异的对映选择性(高达99%ee)和更高的产率合成各种炔丙基胺。与亚胺连接的取代基的性质对获得的对映选择性具有至关重要的作用。宝石的存在发现手性配体的恶唑啉环的C-5位上的-二苯基基团和C-4手性中心上的仲烷基取代基对于更高的对映选择性是至关重要的。还提出了一种涉及π–π堆积的过渡态模型以用于立体化学结果。
Iron-Catalyzed Hydrogen Transfer Reduction of Nitroarenes with Alcohols: Synthesis of Imines and Aza Heterocycles
作者:Jiajun Wu、Christophe Darcel
DOI:10.1021/acs.joc.0c02505
日期:2021.1.1
A straightforward and selective reduction of nitroarenes with various alcohols was efficiently developed using an iron catalyst via a hydrogentransfer methodology. This protocol led specifically to imines in 30–91% yields, with a good functional group tolerance. Noticeably, starting from o-nitroaniline derivatives, in the presence of alcohols, benzimidazoles can be obtained in 64–72% yields when the
Synthesis of Novel β-Lactams from Phenothiazin-10-ylacetic Acid
作者:Zahra Omidvari、Maaroof Zarei
DOI:10.1002/jhet.3138
日期:2018.5
The first synthesis of 3‐phenothiazine‐β‐lactams is herein reported. Thirteen new derivatives of β‐lactams were synthesized using various Schiff bases and (phenothiazin‐10‐yl)acetic acid, which in turn was prepared starting from phenothiazine. The sole product of the Staudinger ketene–imine [2 + 2] cycloaddition reaction is the trans‐β‐lactam. All the synthesized compounds were characterized by elemental
A synthesis of α-amino acids via direct reductive carboxylation of imines with carbon dioxide
作者:Ajay A. Sathe、Douglas R. Hartline、Alexander T. Radosevich
DOI:10.1039/c3cc42057d
日期:——
A method for the synthesis of alpha-amino acids by direct reductive carboxylation of aromatic imines with CO2 is described. The protocol employs readily available commercial reagents and serves as a one-step alternative to the Streckersynthesis.
have developed a novel and practicalmethod for the preparation of α-amino acid derivatives under mild conditions. In this approach, the photoexcited naphthalene thiolate acts simultaneously as a photoexcited single-electron reductant and a hydrogen atom transfer (HAT) catalyst, enabling efficient metal-free radical–radical cross-coupling of formate with ketimines and aldimines.
Highly enantio- and diastereoselective three-component inverse electron-demand aza-Diels-Alder reaction of aldehydes, anilines, and isoeugenol derivatives catalyzed by a chiral phosphoric acid catalyst are reported. A wide variety of 2,3,4-trisubstituted tetrahydroquinolines containing an aryl group at the 4-position were obtained in a one-pot process with good to high yields and excellent stereoselectivities (>95:5 dr and up to >99% ee).