Catalytic Intermolecular Amination of C−H Bonds: Method Development and Mechanistic Insights
摘要:
y Reaction methodology for intermolecular C-H amination of benzylic and 3 degrees C-H bonds is described. This process uses the starting alkane as the limiting reagent, gives optically pure tetrasubstituted amines through stereospecific insertion into enantiomeric 3 degrees centers, displays high chemoselectivity for benzylic oxidation, and enables the facile preparation of isotopically enriched N-15-labeled compounds. Access to substituted amines, amino alcohols, and diamines is thereby made possible in a single transformation. Important information relevant to understanding the initial steps in the catalytic cycle, reaction chemoselectivity, the nature of the active oxidant, and pathways for catalyst inactivation has been gained through mechanistic analysis; these studies are also presented.
Dimethyldioxirane hydroxylation of a hypersensitive radical probe: Supporting evidence for an oxene insertion pathway
作者:Pavel A. Simakov、Seung-Yong Choi、Martin Newcomb
DOI:10.1016/s0040-4039(98)01871-1
日期:1998.11
Dimethyldioxirane oxidation of the hypersensitiveradicalprobe (rans-2-phenylcyclopropyl)ethane gave non-rearranged hydroxylation products consistent with an oxene insertion mechanism for the reaction.
Hypersensitive radical probe studies of Gif oxidations
作者:Martin Newcomb、Pavel A. Simakov、Seung-Un Park
DOI:10.1016/0040-4039(95)02330-5
日期:1996.2
Hypersensitiveprobes were employed in mechanistic studies of Gifoxidations. The results indicate that, unlike the case in enzyme catalyzed hydroxylation reactions, diffusively free radicals are formed in Gifoxidations of these substrates.
Selective Intermolecular Amination of CH Bonds at Tertiary Carbon Centers
作者:Jennifer L. Roizen、David N. Zalatan、J. Du Bois
DOI:10.1002/anie.201304238
日期:2013.10.18
C–H insertion: A method for intermolecularamination of tertiaryCHbonds is described that uses limiting amounts of substrate and a convenient phenol‐derived nitrogen source. Structure‐selectivity and mechanistic studies suggest that steric interaction between the substrate and active oxidant is the principal determinant of product selectivity.