Highly stereo- and regiocontrolled cyclopentannulation via allylphosphonate conjugate addition and hydroboration-oxidation-elimination. Synthesis of pentalenic acid with virtually complete stereo- and regiocontrol
<i>O</i>-Allylated Pudovik and Passerini Adducts as Versatile Scaffolds for Product Diversification
作者:Mansour Dolé Kerim、Tania Katsina、Martin Cattoen、Nicolas Fincias、Stellios Arseniyadis、Laurent El Kaïm
DOI:10.1021/acs.joc.0c01721
日期:2020.10.2
The palladium-catalyzed O-allylation of α-hydroxyphosphonates and α-hydroxyamides obtained from Pudovik and Passerini multicomponent reactions has allowed interesting and highly straightforward access to a variety of building blocks for product diversification. These post-functionalizations include a selective base- or ruthenium hydride-mediated isomerization/Claisen rearrangement cascade and a ring-closing
Palladium-catalysed<i>O</i>-Allylation of α-Hydroxyphosphonates: An Expedient Entry into Phosphono-oxaheterocycles
作者:Mansour Dolé Kerim、Martin Cattoen、Nicolas Fincias、Aurélie Dos Santos、Stellios Arseniyadis、Laurent El Kaïm
DOI:10.1002/adsc.201701150
日期:2018.2.1
We report here an unprecedented palladium-catalysed O-allylation of α-hydroxyphosphonates. The method was eventually included in a sequential Pudovik/Tsuji-Trost type O-allylation/Ring-Closing Metathesis to afford a variety of phosphorylated heterocycles of various sizes ranging from 5 to 16 starting from readily available aldehydes.
effective enantioselective hydrophosphonylation of aldehydes. A variety of aromatic, heteroaromatic, condensed-ring, α,β-unsaturated, and aliphatic aldehydes were found to be suitable substrates for the reaction, and the desired α-hydroxy phosphonate were obtained in good to excellent yields (up to 99%) with moderate to good enantioselectivities (up to 87% ee) under mild conditions (at 0 °C). A possible
Hydrophosphonylation of aldehydes catalyzed by cyclopentadienyl ruthenium(II) complexes
作者:Ivânia R. Cabrita、Pedro R. Florindo、Paulo J. Costa、M. Conceição Oliveira、Ana C. Fernandes
DOI:10.1016/j.mcat.2018.03.001
日期:2018.5
This work reports the first method for the synthesis of α-hydroxyphosphonates from aldehydes catalyzed by cyclopentadienyl ruthenium(II) complexes. The best results were obtained using the system HP(O)(OEt)2/[RuClCp(PPh3)2] (5 mol%), affording the α-hydroxyphosphonates in good to excellent yields with high chemoselectivity. The catalyst [RuClCp(PPh3)2] can be used for at least 12 catalytic cycles with
Nickel-Catalyzed Enantioconvergent Reductive Hydroalkylation of Olefins with α-Heteroatom Phosphorus or Sulfur Alkyl Electrophiles
作者:Shi-Jiang He、Jia-Wang Wang、Yan Li、Zhe-Yuan Xu、Xiao-Xu Wang、Xi Lu、Yao Fu
DOI:10.1021/jacs.9b09415
日期:2020.1.8
bond formation reactions have been made in recent years through the use of transition-metal-catalyzed cross-couplingreactions of racemic secondary alkyl electrophiles with organometallic reagents. Herein, we report a general process for the asymmetric construction of alkyl-alkyl bonds adjacent to heteroatoms, namely, a nickel-catalyzed enantioconvergent reductive hydroalkylation of olefins with α-heteroatom