Electronic structure of bispidine iron(IV) oxo complexes.
|Abstract||The electronic structure, based on DFT calculations, of a range of FeIV=O complexes with two tetra- (L1 and L2) and two isomeric pentadentate bispidine ligands (L3 and L4) is discussed with special emphasis on the relative stability of the two possible spin states (S = 1, triplet, intermediate-spin, and S = 2, quintet, high-spin; bispidines are very rigid diazaadamantane-derived 3,7-diazabicyclo[3.3.1]nonane ligands with two tertiary amine and tw ... [truncated at 450 characters in length]|
|Author||Anastasi, AE; Comba, P; Mcgrady, J; et al|
|Key phrase||Bicyclo Compounds, Heterocyclic Chemistry Electrochemistry Electronics Electrons Iron Ligands Models, Chemical Models, Molecular Molecular Conformation Pyridines Software|
Selective preparation of the [3,5-tBu(2)-1,2,4-C2P3](-) ion and synthesis and structure of the cationic species nido-[3,5-tBu(2)-1,2,4-C2P3](+), isoelectronic with [C5R5](+)
|Abstract||Building pyramids: The first P-C cluster, namely, the novel nido species 2, is readily prepared from 1 (• = CtBu), which is also an excellent precursor for the selective synthesis of the anion 3. DFT calculations show that there is a switch in the global minimum, on the introduction of three P atoms (CH) into the [CH] ion, from cyclic-unsaturated to saturated cage species, such as 2.|
|Author||Lynam, JM; Copsey, MC; Green, M; et al|
|Key phrase||anions cations density functional calculations phosphorus phosphorus heterocycles|
Absolute configuration assignment by asymmetric syntheses of the homalium alkaloids (-)-(R,R,R)-hoprominol and (-)-(4'S,4″R,2‴R)-hopromalinol.
|Abstract||The conjugate addition of lithium (R)-N-(3-chloropropyl)-N-(α-methylbenzyl)amide to α,β-unsaturated esters was used as the key step in the syntheses of all possible diastereoisomers of the homalium alkaloids hoprominol and hopromalinol. Comparison of the specific rotation data for these synthetic samples with those of samples isolated from the natural source enabled the absolute configurations within these alkaloids to be confidently assigned for ... [truncated at 450 characters in length]|
|Author||Davies, SG; Lee, JA; Roberts, PM; et al|
|Key phrase||Alkaloids Amides Heterocyclic Compounds Lithium Compounds Molecular Structure Stereoisomerism|
Synthesis of Cyclic alpha-Aminophosphonates through Copper-Catalyzed Enamine Activation
|Abstract||A copper-catalyzed tandem-cyclization-triggered addition strategy that relies on electrophilic enamine activation has been used to synthesize various cyclic α-aminophosphonate derivatives in good to excellent yields. Both five- and six-membered rings can be generated under mild conditions with high regioselectivity. A mechanism based on copper-catalyzed enamine activation is proposed. © Georg Thieme Verlag Stuttgart · New York.|
|Author||Han, J; Paton, RS; Xu, B; et al|
|Key phrase||copper cyclic alpha-aminophosphonates cyclization enamines hydroamination nitrogen heterocycles phosphorus|
Palladium- and Ruthenium-Catalyzed Cycloisomerization of Enynamides and Enynhydrazides: A Rapid Approach to Diverse Azacyclic Frameworks.
|Abstract||I want to ride my azacycle: The title reaction of enynamides affords a wide diversity of azacycles. The reactions are high-yielding, highly stereoselective, and proceed rapidly under mild reaction conditions. Equivalent transformations using enynhydrazides offer new routes to pyrazole and indazole scaffolds. Boc=tert-butoxycarbonyl, EWG=electron-withdrawing group, Ns=4-nitrobenzenesulfonyl, Ts=4-toluenesulfonyl.|
|Author||Walker, PR; Campbell, CD; Suleman, A; et al|
|Key phrase||cyclization heterocycles homogeneous catalysis palladium ynamide|