N-Cbz sulfilimines as valuable intramolecular nucleophiles for the stereoselective synthesis of (−)-deoxocassine and (+)-desoxoprosophylline
作者:Sadagopan Raghavan、Shaik Mustafa
DOI:10.1016/j.tet.2008.08.031
日期:2008.10
sulfilimine, prepared from the corresponding sulfoxide using the Burgess reagent, has been employed as an intramolecular nucleophile for the regio- and stereoselective preparation of a bromo-carbamate from an alkene. The bromo-carbamate has been utilized as an advanced common synthon for the synthesis of deoxocassine and desoxoprosophylline employing the ene and amidomercuration as key reactions.
An asymmetric synthesis of (+)-desoxoprosophylline
作者:Sadagopan Raghavan、Shaik Mustafa
DOI:10.1016/j.tetlet.2008.06.074
日期:2008.8
An efficient synthesis of (+)-desoxoprosophylline is described. The key steps in the reaction sequence include the preparation of an N-Cbz-sulfilimine from the corresponding sulfoxide using the Burgess reagent, regio- and stereoselective hetero-functionalization of an alkene Using the pendant sufilimine as the nucleophile and a stereoselective amidomercuration to form the cis-2,6-disubstituted piperidine ring. (C) 2008 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of α-hydroxy-β-amino acid derivatives from β-hydroxy-γ,δ-unsaturated sulfilimine
作者:Sadagopan Raghavan、Shaik Mustafa
DOI:10.1016/j.tetlet.2008.03.114
日期:2008.5
The first report on the use of N-sulfinyl benzylcarbamate for the preparation of N-Cbz sulfiliminefrom the corresponding sulfoxide is reported. The sulfilimine moiety is utilized as an intramolecular nucleophile for the regio- and stereoselective heterofunctionalization of an alkene to furnish a bromo carbamate which is used as a key advanced intermediate in the synthesis of representative α-hydroxy-β-amino