Catalytic Enantioselective Synthesis of Highly Functionalized Difluoromethylated Cyclopropanes
作者:Maxence Bos、Wei-Sheng Huang、Thomas Poisson、Xavier Pannecoucke、André B. Charette、Philippe Jubault
DOI:10.1002/anie.201707375
日期:2017.10.16
The first catalyticasymmetricsynthesis of highly functionalized difluoromethylated cyclopropanes is described. The method, based on a rhodium‐catalyzed cyclopropanation of difluoromethylated olefins, gives access to a broad range of cyclopropanes bearing ester, ketone, or nitro functional groups. By using Rh2((S)‐BTPCP)4 as a catalyst, the corresponding products were obtained in high yields and high
The synthesis of monofluoroalkenes using an SN2′ reaction of lithiumamides derived from aromatic amines or lithium thiolates with 3,3-difluoropropenes is reported. This transformation features the use of fluoride as a leaving group.
Biocatalytic Strategy for the Highly Stereoselective Synthesis of CHF
<sub>2</sub>
‐Containing Trisubstituted Cyclopropanes
作者:Daniela M. Carminati、Jonathan Decaens、Samuel Couve‐Bonnaire、Philippe Jubault、Rudi Fasan
DOI:10.1002/anie.202015895
日期:2021.3.22
Enantiodivergent selectivity and extension of the method to the stereoselective cyclopropanation of mono‐ and trifluoromethylated olefins was also achieved. This methodology represents a powerful strategy for the stereoselectivesynthesis of high‐value fluorinated building blocks for medicinal chemistry, as exemplified by the formal total synthesis of a CHF2 isostere of a TRPV1 inhibitor.
Catalytic Asymmetric Synthesis of α,α-Difluoromethylated and α-Fluoromethylated Tertiary Alcohols
作者:Wei-Sheng Huang、Marie-Léonie Delcourt、Xavier Pannecoucke、André B. Charette、Thomas Poisson、Philippe Jubault
DOI:10.1021/acs.orglett.9b02792
日期:2019.9.20
The catalyticasymmetricsynthesis of α,α-difluoromethylated tertiary alcohols is described, using an asymmetric dihydroxylation reaction. This protocol using either the AD-mix-α or AD-mix-β allowed an easy access to these valuable fluorinated chiral building blocks, which have been obtained with excellent yields and er. In addition, the reaction was extended to the α-fluoromethylated analogues.
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.