Controlled α-mono- and α,α-di-halogenation of alkyl sulfones using reagent–solvent halogen bonding
作者:Christopher M. Poteat、Vincent N. G. Lindsay
DOI:10.1039/c9cc00550a
日期:——
The direct and selective α-mono-bromination of alkylsulfones was achieved through base-mediated electrophilic halogenation. The appropriate combination of solvent and electrophilic bromine source was found to be critical to control the nature of the products formed, where reagent–solvent halogen bonding is proposed to control the selectivity via alteration of the effective size of the electrophilic
Ag-catalyzed sulfonylation-peroxidation of alkenes with sulfonyl hydrazides and T-hydro
作者:Ran Xu、Zhiping Li
DOI:10.1016/j.tetlet.2018.09.045
日期:2018.10
The sulfonylation-peroxidation of alkenes with sulfonyl hydrazides and T-hydro was developed. The Ag-catalyzed three-component peroxidation provides a method for synthesis of a variety of β-sulfonyl peroxides, which could be converted into various sulfone derivatives.
Organosilicon compounds with functional groups proximate to silicon
作者:John J. Eisch、James E. Galle
DOI:10.1016/0022-328x(88)89085-5
日期:1988.3
(OEt)2PO and Ph; the groups R and R′ were H, Ph and n-C6H13; and the lithiating reagents were n-butyllithium, t-butyllithium and lithium diisopropylamide in donor media of THF or TMEDA. The lithiation occurs with retention of configuration and the resulting lithio-epoxide is unstable above 0°C, decomposing in a carbenoid manner. The lithiation is facile except for compounds where Z and R (an alkyl
Asymmetric epoxidation of some arylalkenyl sulfones using a modified Juliá–Colonna procedure
作者:Jose-Maria Lopez-Pedrosa、Michael R. Pitts、Stanley M. Roberts、Shanthini Saminathan、John Whittall
DOI:10.1016/j.tetlet.2004.04.190
日期:2004.6
A modified procedure for performing the Juliá–Colonnaepoxidationreaction effects the oxidation of some vinyl sulfones to generate the corresponding epoxides 5–8 in good to excellent optical purity.
[EN] PROCESS FOR THE PRODUCTION OF ASYMMETRIC EPOXIDES UNDER NON-AQUEOUS CONDITIONS AND CATALYTIC COMPOSITION FOR USE THEREIN<br/>[FR] PROCEDE DE PRODUCTION D'EPOXYDES ASYMETRIQUES DANS DES CONDITIONS NON AQUEUSES ET COMPOSITION CATALYTIQUE UTILISEE A CET EFFET
申请人:STYLACATS LTD
公开号:WO2004085415A1
公开(公告)日:2004-10-07
A process for the asymmetric epoxidation of α,β-unsaturated carbonyl or sulphonyl compounds comprising : providing, in the absence of an aqueous phase, a catalyst/reagent composition comprising a poly-amino acid catalyst effective for catalysing the asymmetric epoxidation reaction, the poly-amino acid catalyst encapsulating an expoxidation reagent effective for epoxidation of α,β-unsaturated carbonyl or sulphonyl compounds; contacting the catalyst/reagent composition with an α,β-unsaturated carbonyl or sulphonyl compound substrate under conditions effective to provide at least partial asymmetric epoxidation of the substrate by the epoxidation reagent; and recovering the resulting asymmetric epoxide.