118215-71-7Relevant academic research and scientific papers
Synthesis of 2-bromo-1-aryl-1H-indenes via a Ag(I) promoted domino 2π-electrocyclic ring-opening/4π-electrocyclization reaction of 1,2-diaryl substituted gem-dibromocyclopropanes
Rosocha, Gregory,Batey, Robert A.
, p. 8758 - 8768 (2013/09/23)
2-Bromo-1-aryl substituted indenes can be synthesized from 1,2-diaryl substituted gem-dibromocyclopropanes via a domino reaction sequence. The cascade reaction involves silver(I) promoted ionization and 2π-disrotatory electrocyclic ring-opening, followed by a 4π-conrotatory electrocyclic ring closing reaction of the allylic carbocation intermediate. Reaction conditions utilize silver tetrafluoroborate (AgBF4) in dichloroethane at 65 C. Selectivity effects for the electrocyclization were also studied. The 2-bromoindenes can be further functionalized using cross-coupling reactions, such as the Suzuki-Miyaura protocol. The alkene π-bond of the indenes can also be isomerized to give the thermodynamically more stable 2-bromo-3-aryl-1H-indene isomers using triethylamine in dichloromethane at room temperature.
Investigation of substituent effects on the selectivity of 4π-electrocyclization of 1,3-diarylallylic cations for the formation of highly substituted indenes
Smith, Chris D.,Rosocha, Gregory,Mui, Leo,Batey, Robert A.
supporting information; experimental part, p. 4716 - 4727 (2010/09/05)
(Figure Presented) Differentially substituted 1,3-diaryl-substituted allylic cations generated by ionization of the corresponding allylic alcohols in the presence of a Lewis acid undergo chemoselective and regioselective electrocyclization reactions to generate 1-aryl-1H-indenes. Electrocyclization only occurs for allylic cations bearing a 2-substituent, with 2-ester and 2-alkyl substituents both tolerated. In general, the presence of electron-withdrawing substituents deactivates the ring and disfavors cyclization. In contrast, the selectivity of cyclization of systems containing electron-donating substituents depends on the nature and position of the electron-donating group. Electron-donating substituents at the meta position particularly favor cyclization. There was no obvious correlation of cyclization selectivity with calculated electron densities as has been suggested for electrophilic aromatic substitution reactions. However, the calculated selectivities determined by a gas-phase (B3LYP/6-31G* + ZPVE) comparison of the relative rates of cyclization were in remarkably good agreement with the observed selectivities. Calculated transition-state structures for cyclization are consistent with a cationic π4a conrotatory electrocyclization mechanism. In some cases involving more electron-deficient systems, the initially formed 1H-indene underwent subsequent alkene isomerization to the 3H-indene. In one example, an unusual dimerization reaction occurred to give a cyclopenta[a]indene via an unusual formal cationic 2π+2π cycloaddition of the allylic cation with the intermediate indene.
Indane modulators of glucocorticoid receptor, AP-1, and/or NF/kB activity and use thereof
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Page/Page column 72, (2008/06/13)
Novel non-steroidal compounds are provided that are useful in treating diseases associated with modulation of the glucocorticoid receptor, AP-1, and/or NF-κB activity including obesity, diabetes, inflammatory and immune diseases having the structure of formula (I): or enantiomers, diastereomers, or a pharmaceutically-acceptable salt, or hydrate, thereof, where X is -A1QA2-; Q is a bond, —C(═O)—, —OC(O)—, —C(═O)NR5—, —SOp—, —SOpNR5—, —C(O)O—, —NR5C(O)—, —OC(O)NR5—, —NR5C(O)O—, —S(O)pNR5C(O)—, —C(O)NR5S(O)p— —NR5S(O)p—, or —NR5C(═O)NR6—. Y is selected from hydrogen, C1-4alkyl, OR16, substituted C1-6alkyl, cycloalkyl, aryl, heterocyclo and heteroaryl. A1 and A2 are independently selected from a bond, C1-3alkylene, or C1-3alkenylene, and R1-R11 are defined herein. Also provided are pharmaceutical compositions, combinations, and methods of treating obesity, diabetes and inflammatory- or immune-associated diseases comprising said compounds.
Synthesis of Ethyl 1-Phenyl- and 1-Alkyl-1-indene-2-carboxylates
Jalander, Lars
, p. 343 - 350 (2007/10/02)
The ethyl 1-phenyl and 1-alkyl-1-indene-2-carboxylates 2g and 2a-2f respectively were prepared in 68 - 83percent yield by the reaction pf phenyl- and alkylmagnesium halides with ethyl 1-methoxy-1-indene-2-carboxylate (1c).
