氮掺杂碳催化剂由于其在催化应用方面的诸多优势而吸引了越来越多的研究关注。在此,使用具有成本效益的可再生生物质壳聚糖来制备经氧化铁催化剂(Fe 2 O 3 @NC)改性的N掺杂碳,用于腈合成。氧化铁纳米颗粒均匀地包裹在N掺杂的碳基质中,以防止其聚集和浸出。Fe 2 O 3 @ NC-800在800°C的温度下碳化,在芳族醛催化氨氧化为芳族腈的过程中表现出出色的活性,选择性和稳定性。这项研究可能会提供一种新的方法来制造一种高效且具有成本效益的合成腈的催化剂体系。
Chemoselective Photoredox Synthesis of Unprotected Primary Amines Using Ammonia
作者:Jiawei Rong、Peter H. Seeberger、Kerry Gilmore
DOI:10.1021/acs.orglett.8b01637
日期:2018.7.6
radicals are produced as novel intermediates via a transformation that merges acid-promoted N–H imine generation and chemoselective photocatalytic single-electron reduction. Coupling ammonia and aldehydes/ketones allows the generation of primaryamines under mild conditions without the need for protecting groups. The key intermediate can be efficiently transformed into primary (di)amines by a formal dimerization
This invention relates to agents that are inhibitors or activators of variant forms of endogenous proteins and novel methods of identifying such variants. Of particular interest are inhibitors and activators of endogenous protein variants, encoded by genes which have mutated, which variants often arise or are at least first identified as having arisen following exposure to a chemical agent which is known to be an inhibitor or activator of the corresponding unmutated endogenous protein.
Metal-Free, One-Pot Oxidative Conversion of Aldehydes to Primary Thioamides in Aqueous Media
作者:Arvind K. Yadav、Vishnu P. Srivastava、Lal Dhar S. Yadav
DOI:10.1080/00397911.2013.808350
日期:2014.2
reactions of a variety of aldehydes with aqueous ammonia, molecular iodine, and O,O-diethyl dithiophosphoric acid readily afford the corresponding primarythioamides. This is an inexpensive, practical, and metal-free way of accessing various thioamides from aldehydes in aqueous media. The pure products are obtained simply by filtration followed by successive washing with aqueous sodium thiosulfate
We herein report a general, practical, and highly efficient method for asymmetricsynthesis of a wide range of chiral vicinal diamines via reductive coupling of imines templated by chiral diboron. The protocol features high enantioselectivity and stereospecificity, mild reaction conditions, simple operating procedures, use of readily available starting materials, and a broad substrate scope. The method
Kinetic Resolution of Secondary Allyl Boronates and Their Application in the Synthesis of Homoallylic Amines
作者:Laura Villar、Nikolai V. Orlov、Nikolay S. Kondratyev、Uxue Uria、Jose L. Vicario、Andrei V. Malkov
DOI:10.1002/chem.201804395
日期:2018.11.2
chromatographically‐stable secondary allyl boronates featuring a 1,1,2,2‐tetraethyl‐1,2‐ethanediol fragment (Epin) were obtained by kinetic resolution of their racemic mixtures. The Epin group at boron considerably improved stability of allyl boronates allowing them to be readily isolated by chromatography on silica. The resolved reagents were applied in stereoselective synthesis of homoallylic amines with an internal