The first total synthesis of structurally unique polycyclic phenolic meroterpenoids, ganocins B and C is reported. The synthesis features gold-catalyzed intramolecular cascade cyclization to construct the C/D ring bearing an angular methyl group, diastereoselective Michael addition, and acid-mediated one-pot Robinson cyclization/deprotection/isomerization.
SULPHONATE BASED COMPOUND, POLYMER ELECTROLYTE MEMBRANE COMPRISING SAME AND FUEL CELL COMPRISING SAME
The present invention relates to a novel sulfonate-based compound, a method for preparing the same, a polymer electrolyte membrane comprising the sulfonate-based compound, a membrane electrode assembly comprising the same and a fuel cell comprising the same.
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Paragraph 0097
(2014/10/16)
Efficient synthesis of 5-nitro-benzo[b]furans via 2-bromo-4-nitro-phenyl acetates
Acetylation/Sonogashira cross-coupling reaction/cyclization has been carried out in one-pot using a Na2PdCl4/2-(di-tert-butylphosphino)-N-phenylindole/CuI system in TMEDA to give 5-nitro-2-substituted benzo[b]furans in excellent yields. We also describe the extension of this method to 4-EWG-2-bromo-phenols obtaining 2,5-disubstituted-benzo[b]furans in good yields.
Bochicchio, Antonella,Chiummiento, Lucia,Funicello, Maria,Lopardo, Maria Teresa,Lupattelli, Paolo
experimental part
p. 2824 - 2827
(2010/07/04)
LIQUID CRYSTAL COMPOUND COMPRISING TWO CONDENSED AND SUBSTITUTED RINGS
A new liquid crystal compound comprises two condensed and substituted rings. The ring preferably is a five-membered heterocyclic ring. The heterocyclic ring is preferably condensed with benzene ring or an aromatic six-membered heterocyclic ring. The benzene ring or the aromatic six-membered heterocyclic ring is preferably substituted with a group comprising a cyclic structure and a chain structure. The liquid crystal compound is advantageously used in preparation of a thin phase retarder, such as a wide-ranged l/4 plate, which gives inverse wavelength distribution. The phase retarder can be easily produced according to a simple process by using the new liquid crystal compound.
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Page/Page column 82-84
(2008/06/13)
Formal total synthesis of shikonin via D?tz benzannulation
The D?tz benzannulation reaction provides mild conditions for the construction of highly functionalized aromatic compounds. We have utilized this method for the formal total synthesis of shikonin. The key step in our approach is the application of the D?tz benzannulation reaction between Fischer a chromium carbene complex and an optically active alkyne for the construction of the aromatic skeleton. This is followed by protecting group manipulation and formation of the epoxide moiety using the Sharpless procedure.
Pulley, Shon R.,Czakó, Barbara
p. 5511 - 5514
(2007/10/03)
Total synthesis of siccayne
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Pinault Frangin,Genet,Zamarlik
p. 935 - 937
(2007/10/02)
Reaction of 5-Substituted 2-Methoxy 1,4-Quinones with Boron Tribromide
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Garst, Michael E.,Frazier, Janice D.
p. 446 - 448
(2007/10/02)
Synthesis of 2 bromo 5 acyl hydroquinones
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Ghate,Sarlashkar,Ingle
p. 598 - 599
(2007/10/06)
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