Controllable Intramolecular Unactivated C(sp3)-H Amination and Oxygenation of Carbamates
作者:Qihang Guo、Xiang Ren、Zhan Lu
DOI:10.1021/acs.orglett.8b03299
日期:2019.2.15
catalyst-controlled intramolecular unactivated C(sp3)-H amination and oxygenation of carbamates merging visible-light photocatalysis and earth-abundant transition metal catalysis have been reported. Useful amino alcohol and diol derivatives could be selectively obtained from readily available tertiary alcohol derivatives. The possible mechanisms have been proposed via a 1,5-HAT process followed by Lewis acid-controlled
Importance of C−N Bond Rotation in <i>N</i>-Acyl Oxazolidinones in their SmI<sub>2</sub>-Promoted Coupling to Acrylamides
作者:Rolf H. Taaning、Karl B. Lindsay、Birgit Schiøtt、Kim Daasbjerg、Troels Skrydstrup
DOI:10.1021/ja903401y
日期:2009.7.29
correlates with the activation barriers for C-N bond rotation may have implications for other useful synthetic organic reactions involving similar substrates. Finally, these studies were extrapolated to understanding the poor reactivity of N-acyl oxazolidinones, as those derived from Evans chiral auxiliaries, with N-tert-butyl acrylamide. These couplings appear to be dominated by the activation energy for addition
Synthesis of enantiomerically pure divinyl- and diallylcarbinols
作者:Bernd Schmidt、Holger Wildemann
DOI:10.1039/b200976e
日期:2002.4.9
Acylated oxazolidinones and bornane sultams can be cleaved to divinyl- and diallylcarbinols by treatment with vinyl- or allylmetal compounds. For the preparation of divinylcarbinols, acylated bornane sultams are the starting materials of choice, while for the preparation of diallylcarbinols acylated oxazolidinones and bornane sultams work equally well.
Samarium Diiodide as an Efficient Catalyst for the Conversion of <i>N</i>-Acyloxazolidinones into Esters
作者:Jacqueline Collin、Caroline Magnier-Bouvier、Iréna Reboule、Richard Gil
DOI:10.1055/s-2008-1072587
日期:2008.5
The transformation of N-acyloxazolidinones into esters is readily performed using catalytic amounts of samarium diiodide in tetrahydrofuran at room temperature. This method allows the isolation of various esters without racemization in the case of scalemic substrates and the recovery of oxazolidinones in good yields.
SmI2-promoted intra- and intermolecular C–C bond formation with chiral N-acyl oxazolidinones
作者:Rolf H. Taaning、Laura Thim、Jacob Karaffa、Araceli G. Campaña、Anna-Mette Hansen、Troels Skrydstrup
DOI:10.1016/j.tet.2008.09.044
日期:2008.12
The suitability of chiral oxazolidinones in the SmI2-mediated C–C bond generation between the imide functionality of an N-acyloxazolidinone unit and an olefinic radical acceptor, in both inter- and intramolecular reactions, was investigated. It was shown that the products from an Evans asymmetric alkylation can undergo direct carbon–carbon bond formation with an acrylamide providing chiral acyclic