Remote Oxidation of Aliphatic C–H Bonds in Nitrogen-Containing Molecules
摘要:
Nitrogen heterocycles are ubiquitous in natural products and pharmaceuticals. Herein, we disclose a nitrogen complexation strategy that employs a strong Bronsted acid (HBF4) or an azaphilic Lewis acid (BF3) to enable remote, non-directed C(sp(3))-H oxidations of tertiary, secondary, and primary amine- and pyridine-containing molecules with tunable iron catalysts. Imides resist oxidation and promote remote functionalization.
Multinuclear NMR Spectra, <sup>1</sup>H-T<sub>1</sub> Relaxation, Conformational Behavior, and Intramolecular H<sup>δ</sup><sup>-</sup>····<sup>δ</sup><sup>+</sup>H Contacts of N−Borane Cyclic Adducts in Solution
作者:Marisol Güizado-Rodríguez、Angelina Flores-Parra、Sonia A. Sánchez-Ruiz、Rafael Tapia-Benavides、Rosalinda Contreras、Vladimir I. Bakhmutov
DOI:10.1021/ic000890j
日期:2001.6.1
The VT H-1 NMR and H-1-NOESY spectra revealed "frozen" envelope conformations in solutions of 1 and 2 with the BR3 groups in equatorial positions. The H-1-T-1 relaxation measurements provided determinations of the intramolecular proton-hydride contacts in solutions of adducts 1 and 8.