Regioselectivity in the Reaction of Ethyl Diethoxyphosphorylacetate with 1-Aryl-2-haloalkan-1-ones: Effective Synthesis of 4-Aryl-2-diethoxyphosphoryl-4-oxobutanoates
作者:Tomasz Janecki、Jacek Koszuk、Anna Albrecht
DOI:10.1055/s-2007-966060
日期:2007.6
The regioselectivity of the reaction of ethyl diethoxyphosphorylacetate with 1-aryl-2-haloalkan-1-ones has been investigated. It has been found that, depending on the nature of the halogen atom in 1-aryl-2-haloalkan-1-ones and the reaction conditions, alkylation or olefination products can be obtained with excellent or even full selectivity.
Applications of Allylsamarium Bromide as a Grignard Reagent and a Single-Electron Transfer Reagent in the One-Pot Synthesis of Dienes and Trienes
作者:Yuanyuan Hu、Tao Zhao、Songlin Zhang
DOI:10.1002/chem.200901927
日期:2010.2.1
reagent and a single‐electron transfer (SET) reagent in the reaction of α‐halo, γ‐halo‐α,β‐unsaturated ketones and esters with allylsamarium bromide is reported for the first time in this paper. From a synthetic point of view, a general, efficient and experimentally simple one‐pot method for the preparation of 1,4‐dienes and trienes is developed. A possible mechanism of the transformation is proposed.
P(NMe<sub>2</sub>)<sub>3</sub>-Mediated Reductive Intramolecular Annulation of Benzoylformates Tethered with a Trisubstituted Alkene Unit and Synthesis of 2,2-Disubstituted 2<i>H</i>-Chromenes
作者:Jiayong Zhang、Yuhe Qiu、Biao Zhang、Zhiqiang Huang、Zhengjie He
DOI:10.1021/acs.orglett.1c00286
日期:2021.3.5
report, a P(NMe2)3-mediated reductive intramolecular annulation reaction has been developed with benzoyl formates bearing a trisubstituted alkene unit. It provides a facile synthesis of highly functionalized 2,2-disubstituted 2H-chromenes with a broad substratescope and high efficiency. Experimental results suggest this annulation reaction proceeds via a cascade of alkene isomerization/vinyl o-quinone
Multifunctional Cyclopentadienes as a Scaffold for Combinatorial Bioorganometallics in [(η
<sup>5</sup>
‐C
<sub>5</sub>
H
<sub>2</sub>
R
<sub>1</sub>
R
<sub>2</sub>
R
<sub>3</sub>
)M(CO)
<sub>3</sub>
] (M=Re,
<sup>99m</sup>
Tc) Piano‐Stool Complexes
作者:Angelo Frei、Bernhard Spingler、Roger Alberto
DOI:10.1002/chem.201801271
日期:2018.7.17
AbstractMultifunctional cyclopentadiene (Cp) ligands and their rhenium and 99mTc complexes were prepared by a versatile synthetic route. The properties of these Cp ligands can be tuned on demand, either during their synthesis (variation of R1) or through post‐synthetic functionalization with two equal or different vectors (V1 and V2). Variation of these groups enables a combinatorial approach in the synthesis of bioorganometallic complexes. This is demonstrated by the preparation of Cp ligands containing both electron‐donating and electron‐withdrawing groups at the R1 position and their subsequent homo‐ or heterofunctionalization with biovector models (benzylamine and phenylalanine) under standard amide bond‐formation conditions. All ligands can be coordinated to the fac‐[Re(CO)3]+ and fac‐[99mTc(CO)3]+ cores to give tetrafunctional complexes in straightforward and functional‐group‐tolerant procedures. The 99mTc complexes were prepared in one step, in 30 min, and under aqueous conditions from generator‐eluted [99mTcO4]−.