Fungal metabolites. II. Structural elucidation of minor metabolites, valinotricin, cyclonerodiol oxide, and epicyclonerodiol oxide, from Trichoderma polysporum.
Metal‐free Carbon Monoxide (CO) Capture and Utilization: Formylation of Amines
作者:Hyeong‐Wan Noh、Youngjoon An、Seulchan Lee、Jaehoon Jung、Seung Uk Son、Hye‐Young Jang
DOI:10.1002/adsc.201900185
日期:2019.7.2
transition‐metal complexes. The reaction of TBD with CO afforded TBD‐CO adducts, which were converted to formylated TBD (TBD‐CHO). TBD‐CO adducts may include an interaction of CO with positively charged species based on NMR and IR analysis. In the presence of amines, CO was transferred from TBD‐CO to amines, producing formylated amines with good yields. The reaction mechanism involving TBD‐CO adducts
Chiral Isocyanoazides: Efficient Bifunctional Reagents for Bioconjugation
作者:Valentine G. Nenajdenko、Anton V. Gulevich、Nadezhda V. Sokolova、Andrey V. Mironov、Elizabeth S. Balenkova
DOI:10.1002/ejoc.200901326
日期:2010.3
Chiral scaffolds combining isocyanide and azide groups can be effectively synthesized to permit the efficient construction of both amino (hydroxy) acids and triazole derivatives, which enables the preparation of hybrid peptide molecules by Ugi/ click or click/Ugi strategies.
A long-range chiral relay via tertiary amide group in asymmetric catalysis: new amino acid-derived N,P-ligands for copper-catalysed conjugate addition
作者:Andrei V. Malkov、John B. Hand、Pavel Kočovský
DOI:10.1039/b304131j
日期:——
New N,P-ligands 4-6, derived from valinol and prolinol, respectively, have been developed for the asymmetric, copper(I)-catalysed conjugate addition of diethylzinc to unsaturated ketones; the tertiary amide group has been shown to effectively relay the chiral information from the ligand backbone to the active centre.
A Novel General Route for the Preparation of Enantiopure Imidazolines
作者:Nicola A. Boland、Mike Casey、Stephen J. Hynes、Jonathan W. Matthews、Martin P. Smyth
DOI:10.1021/jo0111006
日期:2002.5.1
A novel procedure for the preparation of enantiopure 1,4-disubstituted 2-imidazolines is reported. Enantiopure beta-amino alcohols are converted into N-hydroxyethylamides, which are reacted with excess thionyl chloride, or with thionyl chloride followed by phosphorus pentachloride to yield N-chloroethylimidoyl chlorides. These intermediates are treated with amines and anilines to produce N-chloroethylamidines