Copper(II) tetrafluroborate-promoted Meinwald rearrangement reactions of epoxides
作者:Mathew W.C. Robinson、Kathryn S. Pillinger、Ian Mabbett、David A. Timms、Andrew E. Graham
DOI:10.1016/j.tet.2010.08.078
日期:2010.10
Epoxides undergo a highly efficient Meinwald rearrangement in the presence of catalytic quantities of copper(II) tetrafluoroborate to give carbonyl compounds in high yields and with excellent selectivity. The low toxicity and ease of handling of this reagent make it an attractive alternative to the more corrosive or costly Lewis acids frequently employed.
Generation of Sulfur Ylides from Sulfonium Salts and Their Reactions. Comparative Study of Electrochemical Reduction with the Base Method and Mechanism Elucidation by the MO Method
作者:Yuichi Okazaki、Fumio Ando、Jugo Koketsu
DOI:10.1246/bcsj.76.2155
日期:2003.11
The cathodic reduction of sulfoniumsalts in acetonitrile in the presence and absence of benzaldehyde was carried out. Results were compared with results of the base method. In the presence of benzaldehyde, the electrochemical reduction gave epoxides as a result of the Corey–Chaykovsky reaction, thus confirming ylide formation. The electrochemical reduction of sulfoniumsalts without benzaldehyde yielded
Synthesis of Chiral Spiro-Aziridine Oxindoles via Aza-Corey–Chaykovsky Reaction of Isatin Derived <i>N-tert</i>-Butanesulfinyl Ketimines
作者:Saumen Hajra、Sk Mohammad Aziz、Bibekananda Jana、Prosenjit Mahish、Dhiraj Das
DOI:10.1021/acs.orglett.5b03564
日期:2016.2.5
A general and direct strategy for the synthesis of chiral spiro-aziridine oxindoles has been developed via an aza-Corey–Chaykovsky reaction of isatin-derived N-tert-butanesulfinyl ketimines with excellent selectivity (dr = 98:2 to >99:1). The method is explored for the synthesis of chiral 3-substituted spiro-aziridine oxindoles with high (2S,3S)-selectivity over (2S,3R).
Sequential- and tandem-oxidation–epoxidation reactions employing guanidine bases
作者:David J. Phillips、Joseline L. Kean、Andrew E. Graham
DOI:10.1016/j.tet.2013.05.036
日期:2013.7
1,5,7-Triazabicyclo[4.4.0]dec-1-ene (TBD) and 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-1-ene (MTBD) promote the efficient formation of sulfonium ylides from sulfonium salts in the Corey-Chaykovsky epoxidation of aldehydes and provide excellent yields of the corresponding epoxides. This reaction protocol can be further adapted to allow for the development of both sequential and tandem-oxidation-epoxidation protocols from aldehydes generated in situ by manganese dioxide (MnO2) or barium manganate (BaMnO4) mediated oxidation reactions. (C) 2013 Elsevier Ltd. All rights reserved.