The asymmetricsynthesis of Maraviroc (UK‐427,857), a chemochine receptor 5 (CCR‐5) receptor antagonist, based on an expeditious organocatalytic enantioselective assembly of the chiral β‐amino aldehyde key fragment is presented. The reactions were performed on a gram‐scale and allow for the rapid construction of new Maraviroc analogues.
Immobilization of <i>cis</i>
-4-Hydroxydiphenylprolinol Silyl Ethers onto Polystyrene. Application in the Catalytic Enantioselective Synthesis of 5-Hydroxyisoxazolidines in Batch and Flow
作者:Junshan Lai、Sonia Sayalero、Alessandro Ferrali、Laura Osorio-Planes、Fernando Bravo、Carles Rodríguez-Escrich、Miquel A. Pericàs
DOI:10.1002/adsc.201800572
日期:2018.8.6
A new family of polystyrene‐supported cis‐4‐hydroxydiphenylprolinol silyl ethers has been prepared, and the resulting polymers have been evaluated as organocatalysts to promote the tandem reaction between N‐protected hydroxylamines and α,β‐unsaturated aldehydes in batch and flow. The new PS‐supported catalysts compare favorably with well‐established immobilized Jørgensen‐Hayashi catalysts, affording
Application of the Tf2O/2-chloropyridine couple in the synthesis of novel 4,5-unsubstituted N-carbamoyl-2,3-dihydroisoxazoles
作者:Ondrej Záborský、Michal Šoral、Róbert Fischer
DOI:10.1016/j.tetlet.2015.03.048
日期:2015.4
Novel, non-racemic 4,5-unsubstituted N-carbamoyl-2,3-dihydroisoxazoles are prepared in moderate to good yields from the corresponding 5-hydroxyisoxazolidines under mild reaction conditions using the Tf2O/2-chloropyridine couple in N-methyl-2-pyrrolidone. (C) 2015 Elsevier Ltd. All rights reserved.