Organocatalyzed cross-dehydrogenative coupling for C(sp3)–O bonds formation: a rapid access to α-aminoxyl isochromans
摘要:
Tetrabutyl ammonium iodide catalyzed cross-dehydrogenative coupling reaction between -C(sp(3))-H of isochromans and N-hydroxyphathalimide has been achieved using tert-butylhydroxyperoxide as theterminal oxidant. This method offers rapid access to prevalent -aminoxyl isochroman architectures. A diverse of synthetic isochromans was tolerated with this protocol, giving the corresponding product in moderate to good yields.[GRAPHICS].
Formation of C–O Bond via Cross-Dehydrogenative Coupling between Isochroman and Oxime under Metal-Free Oxidation Conditions
摘要:
DDQ-mediated C-O bond formation through cross-dehydrogenative coupling (CDC) reaction without any metal catalyst under mild conditions was developed. Series of isochromans and oximes could be employed as substrates, and the products were obtained in good yields.
Photoinduced Electron-Transfer-Promoted Redox Fragmentation of <i>N</i>-Alkoxyphthalimides
作者:Maria Zlotorzynska、Glenn M. Sammis
DOI:10.1021/ol202740w
日期:2011.12.2
new photoinduced electron-transfer-promoted redox fragmentation of N-alkoxyphthalimides has been developed. Mechanistic experiments have established that this reaction proceeds through a unique concerted intramolecular fragmentationprocess. This distinctive mechanism imparts many synthetic advantages, which are highlighted in the redox fragmentation of various heterocyclic substrates.
An efficient oxidative aminooxyarylation of alkenes under a transition-metal-free condition was described. Under the reaction conditions, N-hydroxyphthalimide (NHPI) reacted readily with N-arylacrylamides to produce cyclic products via a radical C–H functionalization process, achieving both C–O and C–C bonds formation in one pot. This reaction provided a facile access to the valuable aminooxylated
A novel, sustainable, environmentally friendly, solvent-free and metal catalyst-free method for the CDC reaction between NHPI and benzyl/ether compounds is described.
Cu-Facilitated C−O Bond Formation Using <i>N</i>-Hydroxyphthalimide: Efficient and Selective Functionalization of Benzyl and Allylic C−H Bonds
作者:Ji Min Lee、Eun Ju Park、Seung Hwan Cho、Sukbok Chang
DOI:10.1021/ja8031218
日期:2008.6.1
A highly efficient protocol for the benzyl or allylic C-H functionalization of simple hydrocarbons has been developed using stoichiometric amounts of N-hydroxyphthalimide and Phl(OAc)(2) in the presence of CuCl catalyst. The reaction was revealed to proceed via a radical pathway, in which phthalimide N-oxyl (PINO) radical plays a dual role, serving as a catalytic hydrogen abstractor from hydrocarbons as well as a stoichiometric reagent to couple with the resultant alkyl radicals.