- 3 regioselectively at ambient temperature to give chiral hydroxylamines m 60 - 80% yield. In addition to these products of a formal ene reaction joined by a subsequent hydrolysis 2-substituted hydroxylamines 40 - 49 are also formed. The 2-substituted hydroxylamines 40, 41, 49 possess trans configurations exclusively. The product distribution is solvent dependent and susceptible to the addition of
A Versatile Tripodal Cu(I) Reagent for C–N Bond Construction via Nitrene-Transfer Chemistry: Catalytic Perspectives and Mechanistic Insights on C–H Aminations/Amidinations and Olefin Aziridinations
作者:Vivek Bagchi、Patrina Paraskevopoulou、Purak Das、Lingyu Chi、Qiuwen Wang、Amitava Choudhury、Jennifer S. Mathieson、Leroy Cronin、Daniel B. Pardue、Thomas R. Cundari、George Mitrikas、Yiannis Sanakis、Pericles Stavropoulos
DOI:10.1021/ja503869j
日期:2014.8.13
intermediates play a major role and are generated by hydrogen-atom abstraction from substrate C-H bonds or initial nitrene-addition to one of the olefinic carbons. Subsequent processes include solvent-caged radical recombination to afford the major amination and aziridination products but also one-electron oxidation of diffusively free carboradicals to generate amidination products due to carbocation
Heterobimetallic Rebound: A Mechanism for Diene-to-Alkyne Isomerization with M---Zr Hydride Complexes (M = Al, Zn, and Mg)
作者:M. J. Butler、A. J. P. White、M. R. Crimmin
DOI:10.1021/acs.organomet.7b00908
日期:2018.3.26
calculations, a heterobimetallic rebound mechanism for diene-to-alkyne isomerization has been proposed. This mechanism explains the origin of heterobimetallic control over selectivity: Mg---Zr complexes are too strongly bound to generate reactive fragments, while Al---Zr complexes are too weakly bound to compensate for the contrathermodynamic isomerization process. Zn---Zr complexes have favorable energetics