Palladium-catalyzed allylic alkylation dearomatization of β-naphthols and indoles with <i>gem</i>-difluorinated cyclopropanes
作者:Zhiyuan Fu、Jianping Zhu、Songjin Guo、Aijun Lin
DOI:10.1039/d0cc07529a
日期:——
route to access 2-fluoroallylic β-naphthalenones and indolenines bearing quaternary carbon centers in good yields with high Z-selectivity via C–C bond activation, C–F bond cleavage and the dearomatization process, benefiting from the wide substrate scope and good functional group tolerance. Moreover, 2-fluoroallylic furanoindoline and pyrroloindolines were achieved in good efficiency via cascade allylic
Herein, we report a rhodium catalyzed directing‐group free regioselective C−H allylation of simple arenes. Readily available gem‐difluorinated cyclopropanes can be employed as highly reactive allyl surrogates via a sequence of C−C and C−F bondactivation, providing allyl arene derivatives in good yields with high regioselectivity under mild conditions. The robust methodology enables facile late‐stage
A Pd-catalyzed ring-opening sulfonylation of gem-difluorocyclopropanes is reported. This protocol involves C-C bond cleavage, β-F elimination, and allylic coupling to form corresponding 2-fluoroallylic sulfones efficiently with Z-selectivity. Different substrates bearing diverse functional groups are tolerated. Moreover, this method is successfully used for the late-stage derivation of several bioactive
Difluorocarbene Addition to Alkenes and Alkynes in Continuous Flow
作者:Pauline Rullière、Patrick Cyr、André B. Charette
DOI:10.1021/acs.orglett.6b00573
日期:2016.5.6
The first in-flow difluorocarbene generation and addition to alkenes and alkynes is reported. The application of continuousflow technology allowed for the controlled generation of difluorocarbene from TMSCF3 and a catalytic quantity of NaI. The in situ generated electrophilic carbene reacts smoothly with a broad range of alkenes and alkynes, allowing the synthesis of the corresponding difluorocyclopropanes
Palladium‐Catalyzed Defluorinative Alkylation of
<i>gem</i>
‐Difluorocyclopropanes: Switching Regioselectivity via Simple Hydrazones
作者:Leiyang Lv、Chao‐Jun Li
DOI:10.1002/anie.202102240
日期:2021.6
can completely switch the reaction selectivity to give the alkylated α-fluoroalkene skeletons (branched selectivity). The unique reactivity of hydrazones that enables analogous inner-sphere 3,3′-reductive elimination driven by denitrogenation, as well as the assistance of steric-embedded N-heterocyclic carbene ligand, are the key to switch the regioselectivity. A wide range of hydrazones derived from