Atom-Economical Synthesis of <i>N</i>-Heterocycles via Cascade Inter-/Intramolecular C−N Bond-Forming Reactions Catalyzed by Ti Amides
作者:Hao Shen、Zuowei Xie
DOI:10.1021/ja101796k
日期:2010.8.25
Direct and efficient catalytic reactions with excellent regioselectivity for the preparation of a series of substituted isoindoles, isoquinolines, and imidazoles are reported. Reaction of C(6)H(4)(2-CN)C[triple bond]C-R with an array of amines, catalyzed by 10 mol % of [sigma:eta(1):eta(5)-(OCH(2))(Me(2)NCH(2))C(2)B(9)H(9)]Ti(NMe(2)) (1), gives a series of substituted isoindoles in very high yields
Ni@Pd nanoparticles supported on ionic liquid-functionalized KCC-1 as robust and recyclable nanocatalysts for cycloaddition of propargylic amines and CO<sub>2</sub>
heterogeneous catalyst systems comprised of a fibrous nanosilica‐supported nano‐Ni@Pd‐based ionic liquid (KCC‐1/IL/Ni@Pd) are described for the cyclization of propargylic amines with CO2 to provide 2‐oxazolidinones. KCC‐1 with highsurfacearea was functionalized with IL acting as a robust anchor so that the nano‐Ni@Pd was well dispersed on the fibres of the KCC‐1 microspheres, without aggregation. Because
描述了一种新型的非均相催化剂体系,该体系由纤维纳米二氧化硅支撑的基于纳米Ni @ Pd的离子液体(KCC-1 / IL / Ni @ Pd)组成,用于将炔丙基胺与CO 2环化以提供2-恶唑烷酮。高表面积的KCC-1被IL用作坚固的锚定物进行了功能化,因此nano-Ni @ Pd很好地分散在KCC-1微球的纤维上,没有聚集。由于IL的放大作用,实现了纳米催化剂的高负载能力。报告的合成方法包括无溶剂条件,操作简便,反应时间短,对环境无害的反应条件,成本效益,高原子经济性和优异的收率等诸多优点,使其成为真正的绿色方案。
NHC–Gold(I) Complexes as Effective Catalysts for the Carboxylative Cyclization of Propargylamines with Carbon Dioxide
作者:Shun Hase、Yoshihito Kayaki、Takao Ikariya
DOI:10.1021/om400949m
日期:2013.10.14
NHC–gold(I) complexes promote carboxylative cyclization of a range of propargylic amines to afford (Z)-5-alkylidene-1,3-oxazolidin-2-ones in methanol under neutral and mild conditions. The highly active and robust catalyst permits CO2 utilization under a mixed gas atmosphere containing CO or H2. As a key intermediate, a new alkenylgold(I) complex was successfully identified from a stoichiometric reaction
Direct Functionalization of Lithium Phosphine Oxides Bearing an Alkyne Chain
作者:Hamdi Sanaa、Ali Samarat、Muriel Durandetti
DOI:10.1002/ejoc.202200738
日期:2022.9.20
Selective hydrophosphorylation of carbonyl bonds was developed via a lithium phosphineoxide intermediate, resulting in intermolecular addition to an aldehyde, instead of the intramolecular cyclisation pathway. Valuable alkynyl phosphorated alcohols were obtained in good yields and moderate diastereoselectivity.