Late-Stage Deoxyfluorination of Alcohols with PhenoFluor
作者:Filippo Sladojevich、Sophie I. Arlow、Pingping Tang、Tobias Ritter
DOI:10.1021/ja3125405
日期:2013.2.20
An operationally simple protocol for the selective deoxyfluorination of structurally complex alcohols is presented. Several fluorinated derivatives of natural products and pharmaceuticals have been prepared to showcase the potential of the method for late-stage diversification and its functional group compatibility. A series of simple guidelines for predicting the selectivity in substrates with multiple alcohols is given.
Synthesis of α-trifluoromethylated amides by Eschenmoser–Claisen-type rearrangement of allylic alcohols
A new, mild method to prepare alpha-trifluoromethylated amides bearing an additional trans-configured double bond in gamma-position is described. Treatment at room temperature of fluorinated and non-fluorinated allylic alcohols 1 and 2 with the 1,1,3,3,3-pentafluoropropene-diethylamine adduct (PFPDEA) in the presence of triethylamine as base gave the products of [3,3]-sigmatropic Eschenmoser-Claisen-type rearrangements with good yields and excellent diastereoselectivity due to chair-like conformations of transition states. Starting with enantiomerically enriched allylic alcohols chirality transfer from carbon 3 of the allylic system to carbon 2 of the final alpha-trifluoromethyl carboxamides was observed. This methodology was applied to both simple and more complex, including terpenic, allylic alcohols and might be developed to an alternative strategy to the well-known electrophilic alpha-trifluoromethylation of carbonyl compounds. (C) 2012 Elsevier B.V. All rights reserved.
PREPARATION OF (THREO)-1-ARYL-2-ACYLAMIDO-3-FLUORO-1-PROPANOLS
申请人:SCHERING CORPORATION
公开号:EP0200739A1
公开(公告)日:1986-11-12
FLUORINE AND PHOSPHOROUS-CONTAINING AMPHIPHILIC MOLECULES WITH SURFACTANT PROPERTIES
申请人:APPLICATIONS ET TRANSFERTS DE TECHNOLOGIES AVANCEES ATTA