31269-75-7Relevant academic research and scientific papers
Tetraquinanes via [4 + 4] photocycloaddition/transannular ring closure
Chen, Peiling,Carroll, Patrick J.,Sieburth, Scott McN.
, p. 4510 - 4512 (2010)
Intramolecular [4 + 4] photocycloaddition of a furan and a cyclopentane-annulated 2-pyridone yields a cyclooctadiene product with four new stereogenic centers. Transannular ring closure produces the 5 - 5 - 5 - 5 fused ring system of the crinipellins, inc
Total Synthesis of Adunctin B
Dethe, Dattatraya H.,Dherange, Balu D.
, p. 3392 - 3396 (2018)
Total synthesis of (±)-adunctin B, a natural product isolated from Piper aduncum (Piperaceae), has been achieved using two different strategies, in seven and three steps. The efficient approach features highly atom economical and diastereoselective Friedel-Crafts acylation, alkylation reaction and palladium catalyzed Wacker type oxidative cyclization.
Synthesis of the (+)-Enantiomer of Taonianone, a Furanoid Diterpene from Brown Algae
Huckestein, Martina,Kreiser, Wolfgang,Rueschenbaum, Volker
, p. 445 - 447 (1987)
The constitution and absolute configuration of the furanoditerpene taonianone (1) has been established by synthesis starting from (-)-carveol (2).
Biomimetic Total Syntheses of Callistrilones A, B, and D
Dethe, Dattatraya H.,Dherange, Balu D.,Das, Saikat
, p. 680 - 683 (2018)
A biomimetic total syntheses of antibacterial natural products (±)-callistrilones A, B, and D, the first triketone-phloroglucinol-monoterpene hybrids with an unprecedented [1]benzofuro[2,3-a]xanthene and [1]benzofuro[3,2-b]xanthene pentacyclic ring system
Novel reaction pathways for 2-pyridone [4+4] photoadducts
Chen, Peiling,Chen, Yanping,Carroll, Patrick J.,Sieburth, Scott McN.
, p. 3367 - 3370 (2006)
Transannular ring closure of a pyridone-furan [4+4] photoadduct has been evaluated in a model system. A combination of nitrogen substitution and an isopropyl group gave full control of the four new stereogenic centers. Chlorination transformed the 1,5-cyc
Metal-catalyzed silylene insertions of allylic ethers: Stereoselective formation of chiral allylic silanes
Bourque, Laura E.,Cleary, Pamela A.,Woerpel
, p. 12602 - 12603 (2008/09/16)
Silylene insertion into allylic ethers occurs suprafacially to provide enantioenriched allylic silanes and disilanes. Silylene insertion to a variety of protected allylic alcohols utilizing silver- and copper-mediated conditions proved to be a general method for allylic silane formation. Allylic disilanes reacted similarly to allylic silanes, undergoing both annulation and allylation reactions. Copyright
Mitsunobu Reaction of Unbiased Cyclic Allylic Alcohols
Shull, Brian K.,Sakai, Takashi,Nichols, Jeffrey B.,Koreeda, Masato
, p. 8294 - 8303 (2007/10/03)
The stereochemical inversion of unbiased allylic alcohols using triphenylphosphine, diethyl azodicarboxylate, and benzoic acid, commonly known as the Mitsunobu reaction, was studied in three different solvents with specific attention toward the product composition. The results generated for the Mitsunobu reaction of (R)-3-deuterio-2-cyclohexen-1-ol and the cis and trans isomers of 1-deuterio-5-methyl-2-cyclohexen-1-ol, 1-deuterio-5-tert-butyl-2-cyclohexen-1-ol, and optically active cis and trans 5-isopropyl-2-methyl-2-cyclohexen-1-ol all gave similar product distributions with respect to inversion and retention at the carbinol center as well-as syn and anti Sn2′ type addition when THF or benzene was used as the solvent (CH2Cl2 gave less selective product distributions). Interestingly, it was found that the quasi-equatorial and quasi-axial nature of the starting allylic alcohol does not appear to affect the product distribution for this reaction, nor does methyl substitution at the central carbon of the allylic alcohol. In all cases, significant amounts (8-28%) of non-SN2 type products were detected for these sterically unbiased allylic alcohols; only 72-77% of the product was from SN2 type reaction when sterically undemanding (R)-S-deuterio-2-cyclohexen-1-ol was subjected to Mitsunobu conditions.
LIGHT-MEDIATED TRANSFORMATIONS OF OLEFINS INTO ALCOHOLS: REACTIONS OF HYDROXYL RADICALS WITH CYCLOALKENES
Sonawane, H. R.,Nanjundiah, B. S.,Kelkar, R. G.
, p. 6673 - 6682 (2007/10/02)
Reactions of hydroxyl radicals, generated by photodecomposition of hydrogen peroxide in acetonitrile, with a wide variety of cycloalkenes have been examined.The results show that the major reaction is the addition of hydroxyl radicals to the less substituted end of the double bond, furnishing the secondary alcohols.The reactivity pattern and the observed regio- and stereoselectivity clearly reveal that the steric parameters associated with the substrates play a dominant role in directing the addition reactions.More importantly, this study led to the development of a new methodology for the facile conversions of olefins essentially into secondary alcohols, and includes a few examples which demonstrate the potential of the method.
Lanthanoids in Organic Synthesis. 6. The Reduction of α-Enones by Sodium Borohydride in the Presence of Lanthanoid Chlorides: Synthetic and Mechanistic Aspects
Gemal, Andre L.,Luche, Jean-Louis
, p. 5454 - 5459 (2007/10/02)
Lanthanoid chlorides (LnCl3) are efficient catalysts for the regioselective 1,2-reduction of α-enones by NaBH4 in methanol solution.Optimal conditions of this reaction have been determined.A mechanistic interpretation depicting the role of the Ln3+ ions is given.The major effect of Ln3+ is the catalysis of BH4- decomposition by the hydroxylic solvent to afford alkoxyborohydrides, which may be responsible for the observed regioselectivity.The stereoselectivity of the process is also modified by the presence of the Ln3+ ions, in that axial attack of cyclohexanone systems is enhanced.
