1515-80-6Relevant articles and documents
Diastereomeric (η4-diene)Fe(CO)3 complexes containing chiral amide groups: A convenient method for the resolution of amino acids
Schumacher, Marc,Coste, Gerald,Miesch, Laurence
, p. 1014 - 1020 (2009)
Diastereomeric (η4-N-substituted-hexa-2,4-dienamide)-Fe(CO) 3 complexes bearing chiral amide groups were used for the resolution of (η4-dienecarboxylic acid)Fe(CO)3 complexes. Using the latter, enantiomerically pure proteinogenic or nonproteinogenic a-amino acids were prepared. Georg Thieme Verlag Stuttgart.
Conformational Analysis of Open-Chain 1,2:3,4-Diepoxides: Comparison of Crystal Structures, NMR Data, and Molecular-Orbital Calculations
Bur, Daniel,Nikles, Martin,Sequin, Urs,Neuburger, Martin,Zehnder, Margareta
, p. 1863 - 1875 (1993)
Several pairs of diastereomeric open-chain 1,2:3,4-diepoxides with different substitution patterns were prepared (see 3-9).As far as possible, crystal structures were determined to corroborate the relative configurations and to give insight into the solid-state conformations of these compounds.The comparison with our earlier molecular-orbital calculations and with 1H-NMR measurements shows that the solid-state conformations of eight out of the nine open-chain 1,2:3,4-diepoxides, whose crystal structures had been determined, correspond to substituted diepoxides of the erythro-series (e-6, e-7, e-9) seem to prefer the same conformation as in the crystal.The solution conformations of all other diepoxides differ from the arrangement in the solid state.
Bioinspired intramolecular diels-alder reaction: A rapid access to the highly-strained cyclopropane-fused polycyclic skeleton
Zhu, Shifa,Guo, Zhengjiang,Huang, Zhipeng,Jiang, Huanfeng
supporting information, p. 2425 - 2430 (2014/03/21)
A bioinsipred gold-catalyzed tandem Diels-Alder/Diels-Alder reaction of an enynal and a 1,3-diene, forming the highly-strained benzotricyclo[3.2.1.0 2,7]octane skeleton, was reported. In contrast, a Diels-Alder/Friedel-Crafts tandem reaction occurred instead when silver salts were used as the catalyst. Although both reactions experienced the similar Diels-Alder reaction of a pyrylium intermediate with a 1,3-diene, they have different reaction mechanisms. The former proceeded with a stepwise Diels-Alder reaction, while the latter one with a concerted one. Mother nature knows best! A gold-catalyzed reaction of enynals and 1,3-dienes, giving rapid access to the highly strained benzotricyclo[3.2.1.02,7]octane skeleton, is reported (see scheme; QMD=quinodimethane). Owing to the mild reaction conditions, excellent substrate scope, and high functional-group tolerance, this system holds potential for the construction of complex molecules with the tricyclo[3.2.1.02,7]octane skeleton. Copyright
