[EN] 4,4-DISUBSTITUTED-1,4-DIHYDROPYRIMIDINES AND THE USE THEREOF AS MEDICAMENTS FOR THE TREATMENT OF HEPATITIS B [FR] 1,4-DIHYDROPYRIMIDINES 4,4-DISUBSTITUÉES ET LEUR UTILISATION EN TANT QUE MÉDICAMENTS POUR LE TRAITEMENT DE L'HÉPATITE B
Br, I, OAc, OTf) complexes, providing tertiary propargylic trifluoromethyl alcohols in high yields and with excellent chemoselectivity from a broad range of aryl‐ and more challenging alkyl‐substituted trifluoromethyl ketones (TFMKs). DFT calculations were performed to rationalize the correlation between the yield of catalytic alkynylation and the sterics of N‐heterocycliccarbenes (NHCs), expressed
The synthesis of monofluoroalkenes bearing a malonate or its derivatives at the β position is presented. The reaction can be performed with various 3,3-difluoropropenes. A preliminary result for an enantioselective variant is also reported. Further synthetic transformations of a monofluoroalkene were also accomplished.
Activation of Allylic CF bonds: Palladium-Catalyzed Allylic Amination of 3,3-Difluoropropenes
作者:Xavier Pigeon、Maxime Bergeron、Francis Barabé、Pascal Dubé、Heather N. Frost、Jean-François Paquin
DOI:10.1002/anie.200904747
日期:2010.2.1
keep one! A wide range of cyclic and acyclic β‐aminofluoroalkenes are prepared by the title reaction. The key fluorinated palladium π‐allyl intermediate is generated using a catalytic allylic CF bond activation.
The Use of Fluoride as a Leaving Group: SN2′ Displacement of a CF Bond on 3,3-Difluoropropenes with Organolithium Reagents To Give Direct Access to Monofluoroalkenes
Lithium is the key to activate the nucleofuge ability of fluoride in the title transformation (see scheme). This simple and straightforward approach not only provides a practical synthetic method for the preparation of monofluoroalkenes, an important fluorinated motif, but also demonstrates the ability of fluoride to act as a competent leaving group in nucleophilic substitution reactions.
Trifluorinated Tetralins via I(I)/I(III)‐Catalysed Ring Expansion: Programming Conformation by [CH
<sub>2</sub>
CH
<sub>2</sub>
] → [CF
<sub>2</sub>
CHF] Isosterism
作者:Jessica Neufeld、Timo Stünkel、Christian Mück‐Lichtenfeld、Constantin G. Daniliuc、Ryan Gilmour
DOI:10.1002/anie.202102222
日期:2021.6.7
discovery. To expand the current portfolio, the synthesis of novel trifluorinated tetralins has been achieved. Fluorinated methyleneindanes serve as convenient precursors and undergo efficient difluorinative ringexpansion with in situ generated p-TolIF2 (>20 examples, up to >95 %). A range of diverse substituents are tolerated under standard catalysis conditions and this is interrogated by Hammett analysis