allyl/propargyl carbonates using bis(pinacolato)diboron (B2pin2) as a reactant is described. The reaction proceeds under relatively mild reaction conditions, providing conjugated gem-difluoroalkenes in moderate to good yields. Applications of the resulting 1,1-difluoro-1,3-dienes by [4 + 2] cycloadditionreactions with maleimide led to cyclic fluorinated products efficiently.
Novel reductive olefination mediated by Ti(O-i-Pr)4 and Ph3P. One-pot synthesis of trifluoromethylated trans-allylic alcohols
作者:Yanchang Shen、Yuming Zhang、Yuefen Zhou
DOI:10.1039/a806271d
日期:——
A novel reductive olefination mediated by Ti(O-i-Pr)4 and Ph3P and its application to the ‘one-pot’ synthesis of perfluoroalkylated trans-allylic alcohols are described.
Synthesis and Properties of
<scp>
CF
<sub>3</sub>
</scp>
(
<scp>
OCF
<sub>3</sub>
</scp>
)
<scp>CH‐Substituted</scp>
Arenes and Alkenes
<sup>†</sup>
作者:Wen‐Qi Xu、Xiu‐Hua Xu、Feng‐Ling Qing
DOI:10.1002/cjoc.202000062
日期:2020.8
developed to access novel CF3(OCF3)CH‐containing compounds. Deprotonation of CF3(OCF3)CH‐substitutedarenes afforded synthetically useful CF3O‐substituted gem ‐difluoroalkenes. Furthermore, evaluation of the lipophilicities (log P ) indicated that CH(OCF3)CF3 is more lipophilic than the common fluorinated motifs such as CF3, OCF3, and SCF3, thus rendering the CH(OCF3)CF3 motif appealing in drug discovery
Trifluoromethylated allyl alcohols: acid-promoted reactions with arenes and unusual ‘dimerization’
作者:Anna N. Kazakova、Roman O. Iakovenko、Vasiliy M. Muzalevskiy、Irina A. Boyarskaya、Margarita S. Avdontceva、Galina L. Starova、Aleksander V. Vasilyev、Valentine G. Nenajdenko
DOI:10.1016/j.tetlet.2014.10.083
日期:2014.12
An unusual 'dimerization' of CF3-allyl alcohols [ArCH=CHCH(OH)CF3] under the action of anhydrous FeCl3 was found to give fluorinated indanes in 62-90% yields via the formation of intermediate allyl cations. Reactions of CF3-allyl alcohols with arenes (Ar'H) led to CF3-alkenes [Ar(Ar')CHCH=CHCF3] in 48-75% yields. The mechanisms of the transformations are discussed. (C) 2014 Elsevier Ltd. All rights reserved.
Shen, Yanchang; Zhang, Yuming; Zhou, Yuefen, Journal of the Chemical Society. Perkin transactions I, 1999, # 12, p. 1759 - 1763