Experimental and Computational Studies of the Iron‐Catalyzed Selective and Controllable Defluorosilylation of Unactivated Aliphatic
<i>gem</i>
‐Difluoroalkenes
The first iron‐catalyzeddefluorosilylation of unactivatedgem‐difluoroalkenes was developed, delivering gem‐disilylated alkenes and (E)‐silylated alkenes with excellent efficiency. This protocol features good functional group compatibility and excellent regio‐ and stereoselectivity, enabling the late‐stage silylation of biologically relevant compounds, thus providing good opportunities for applications
Synthesis of Trifluoromethyl-Substituted Cyclopropanes via Sequential Kharasch–Dehalogenation Reactions
作者:Julie Risse、Mariano A. Fernández-Zúmel、Yanouk Cudré、Kay Severin
DOI:10.1021/ol3011369
日期:2012.6.15
A two-step process for the synthesis of trifluoromethyl-substituted cyclopropanes is described. Halothane, an anesthetic agent, is added to olefins in a ruthenium-catalyzedKharaschreaction. The resulting 1,3-dihalides are converted into cyclopropanes by dehalogenation with magnesium. This procedure represents an alternative to metal-catalyzed cyclopropanations involving trifluoromethyl diazomethane
Nucleophilic substitution reactions of difluorormethyl phenyl sulfone with alkyl halides leading to the facile synthesis of terminal 1,1-difluoro-1-alkenes and difluoromethylalkanes
申请人:Prakash Surya G. K.
公开号:US20060052643A1
公开(公告)日:2006-03-09
(Benzenesulfonyl)difluoromethyl anion, in situ generated from difluoromethyl phenyl sulfone and a base, was found to easily undergo nucleophilic substitution reactions (S
N
2) with primary alkyl halides, elemental halogens, and perfluoroalkyl halides with good selectivity. The formed (benzenesufonyl)difluoromethylalkanes are useful intermediates for the facile preparation of 1,1-difluoro-1-alkenes and difluorometbylalkanes. Thus, difluoromethyl phenyl sulfone acts as both “CF
2
═” and “CF
2
H
−
” synthons.
[EN] NUCLEOPHILIC SUBSTITUTION REACTIONS OF DIFLUOROMETHYL PHENYL SULFONE WITH ALKYL HALIDES LEADING TO THE FACILE SYNTHESIS OF TERMINAL 1,1-DIFLUORO-1-ALKENES AND DIFLUOROMETHYLALKANES<br/>[FR] REACTIONS DE SUBSTITUTION NUCLEOPHILIQUE DU DIFLUOROMETHYL- PHENYLSULFONE PAR DES HALOGENURES D'ALKYLE CONDUISANT A UNE SYNTHESE FACILE DE 1,1-DIFLUORO-1-ALCENES ET DE DIFLUOROMETHYLALCANES
申请人:UNIV SOUTHERN CALIFORNIA
公开号:WO2005097739A2
公开(公告)日:2005-10-20
(Benzenesulfonyl)difluoromethyl anion, in situ generated from difluoromethyl phenyl sulfone and a base, was found to easily undergo nucleophilic substitution reactions (SN2 with primary alkyl halides, elemental halogens, and perfluoroalkyl halides with good selectivity. The formed (Benzenesulfonyl) difluoromethylalkanes are useful intermediates for the facile preparation of 1,1-difluoro-1alkenes and difluoromethylalkanes. Thus, difluoromethyl phenyl sulfone acts as both “CF2=” and CF2H” synthons.