2903-23-3Relevant academic research and scientific papers
Compounds having protected hydroxy groups
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, (2008/06/13)
The present invention relates to compounds with protected hydroxy groups of formula (I) These compounds are precursors for organoleptic agents, such as fragrances, and masking agents and for antimicrobial agents. When activated, the compounds of formula (I) are cleaved and form one or more organoleptic and/or antimicrobial compounds.
Compounds having protected hydroxy groups
-
, (2008/06/13)
The present invention relates to compounds with protected hydroxy groups of formula (I) These compounds are precursors for organoleptic agents, such as fragrances, and masking agents and for antimicrobial agents. When activated, the compounds of formula (I) are cleaved and form one or more organoleptic and/or antimicrobial compounds.
An easy deoxygenation of conjugated epoxides
Righi, Giuliana,Bovicelli, Paolo,Sperandio, Anna
, p. 1733 - 1737 (2007/10/03)
An easy and high yielding transformation of epoxyketones and phenyl substituted epoxides to trans olefins in a convergent diastereoselective process is reported. The method was applied to the selective C-25 hydroxy- functionalisation of 3-keio-Δ4-cholestan-3-one, a key intermediate for the synthesis of C-25 hydroxy vitamin D3. (C) 2000 Elsevier Science Ltd.
Pyrylium salts with long Alkyl substituents. IV 1 2,6-Dipentyl-4-methylpyrylium salts and derived pyridinium salts
Bogǎ?ian, Mariana,Mihai, Gheorghe,Plave?i, Marieta,Chiraleu, Filip,Maganu, Maria,Bǎdescu, Virgil,Balaban, Teodor Silviu
, p. 315 - 320 (2007/10/03)
The crystalline pyrylium salts were obtained by SnCl4 catalyzed acylation of isobutene (from t-butyl chloride) with hexanoyl chloride (caproyl chloride). Some intermediates and by-products of the acylation reaction are described. A new corresponding pyridine and N-methyl, N-phenyl, N-dodecyl pyridinium salts have been synthesized. These derivatives were characterized by 1H, 13C-NMR, emission and GC-MS spectra.
Substituted propargylic sulfoxides: synthesis and -sigmatropic rearrangement in the presence of thiophilic reagents
Baudin, J. B.,Julia, S. A.,Lorne, R.
, p. 440 - 456 (2007/10/02)
The allenic sulfoxides 2 and 12 were converted into the substituted propargylic sulfoxides 3 and 13, respectively, by deprotonation with methyl lithium and reaction with electrophilic reagents.Smooth thermal -sigmatropic rearrangement of 3 and 13, using 2-mercapto-1-methylimidazole to desulfurize the intermediate allenic sulfenate XVa, yielded the corresponding conjugated enones 10.The possible reaction mechanism for these two transformations were examined. Key words: Allenic sulfoxides; propargylic sulfoxides; organolithium compounds adjacent to sulfoxides; -sigmatropic rearrangement; desulfurization; α,β-unsaturated enones; furanes.
The Friedel-Crafts reaction of acid chlorides with ethene; di-addition and molecular rearrangement
Bates,Donnelly,Keegan
, p. 4991 - 5000 (2007/10/02)
Acid chlorides, complexed with excess aluminium chloride, reacted with ethene to form 3-methyl-2-buten-1-ones, i.e. rearranged di-addition products having a terminal isoprenoid skeleton, together with the usual β-chloropropanones. The latter were the sole products in the absence of excess catalyst. Acid chlorides containing a suitably situated π-system underwent intramolecular cyclization, e.g. 2-phenylcyclopropanecarbonyl chloride (10) cyclized to 3,4-benzobicyclo[3.1.0]hexan-2-one (11).
Lewis Acid - Mediated Addition of Lithiated Alkyl Phenyl Sulphones and Oxiranes. A Method for Synthesis of α,β-Unsaturated Ketones
Marczak, S.,Wicha, J.
, p. 1511 - 1520 (2007/10/02)
Efficiency of the reaction of lithiated alkyl aryl sulphones (1-4) with oxiranes (5, 6) is increased by the presence of BF3 or CeCl3.The respective adducts (7-14) were transformed into α,β-unsaturated ketones (15-22) with high yields.
