Synthesis of Imidazolidinone, Imidazolone, and Benzimidazolone Derivatives through Oxidation Using Copper and Air
作者:Dazhi Li、Thierry Ollevier
DOI:10.1021/acs.orglett.9b00973
日期:2019.5.17
synthetic method of urea derivativesusing copper and air was developed. These mild conditions provided moderate to very good yields for 15 examples (53–93%), while low yields were obtained with sterically hindered substrates (3 examples). The reaction was found to go through an in situ generated copper–N-heterocyclic carbene, which was then oxidized into cyclic urea derivatives possessing alkyl, benzyl
Correction to Halogen-Bonding-Induced Hydrogen Transfer to C═N Bond with Hantzsch Ester
作者:Wei He、Yi-Cen Ge、Choon-Hong Tan
DOI:10.1021/acs.orglett.9b02822
日期:2019.9.20
The structure of C1 has been revised in the Graphical Abstract/Table of Contents graphic. The structures of C1, C2, and C3 have been revised in Figure 1. Figure 1. Halogen-bond donors C1–C7. The structure of neutral iodoimidazoline has been revised in Scheme 1. The structure of C1 has been revised in Figure 3. Figure 3. 13C NMR spectra of C1 and 1a in CD2Cl2: (a) C1; (b) C1 + 1a (1:1); (c) 1a. The
[reaction: see text] Formamidineureas display a rich manifold of reactivity. Thiols induce substitution at the carbonyl carbon to give thiolcarbamates; base-mediated alkylation and acylation occurs at the terminal urea nitrogen, and a new fragmentation/acylation pathway has been uncovered with isocyanates.
photoluminescence originates from multiple emissive excited states as a result of the existence of varied Au(I)···Au(I) distances in ground state. The steric properties of the NHC ligand are crucial to the tuning of Au(I)···Au(I) distances. We also demonstrate an anti-counterfeiting application using these two salts. This unique Ex-De CPL mechanism of the metal complex double salts opens a new avenue for the
Direct Catalytic Asymmetric Mannich-Type Reaction of Benzyl Isocyanide: Stereoselective Synthesis of 1,2-Diarylethylenediamines
作者:Keiji Tamura、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1002/ejoc.201500336
日期:2015.5
A directcatalyticasymmetricMannich-typereaction of benzyl isocyanide using a CuI catalyst and N-(diphenylthiophosphinoyl)imines was developed. The simultaneous activation strategy by soft–soft interaction was the key to promote the reaction using a weakly acidic pronucleophile, benzyl isocyanide. The spontaneous cyclization of the Mannich adduct afforded the corresponding enantioenriched imidazolines
开发了使用 CuI 催化剂和 N-(二苯基硫代膦酰基) 亚胺的苄基异氰化物的直接催化不对称曼尼希型反应。通过软-软相互作用的同时激活策略是使用弱酸性亲核试剂苄基异氰化物促进反应的关键。曼尼希加合物的自发环化得到相应的对映体富集的咪唑啉,它可能是各种 1,2-二芳基乙二胺的前体。