2162-33-6Relevant academic research and scientific papers
InCl3 immobilized in ionic liquids: A novel and recyclable catalytic system for tetrahydropyranylation and furanylation of alcohols
Yadav, Jhillu Singh,Reddy, Basi V. Subba,Gnaneshwar, Dughani
, p. 202 - 204 (2003)
A mild and highly efficient method has been developed for the protection of hydroxyl compounds as tetrahydropyranyl and furanyl ethers using a catalytic amount of indium trichloride immobilized in 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid under mild conditions. A wide range of functional and protecting groups such as THP, TBDMS, TBDPS, PMB, MOM ethers, acetonides, olefins and epoxides are compatible with ionic liquids. Monoprotection of diols has also been achieved using this novel procedure.
Microwave-mediated selective monotetrahydropyranylation of symmetrical diols catalyzed by iodine
Deka,Sarma
, p. 1947 - 1948 (2001)
Selective protection of one hydroxyl group as its tetrahydropyranyl ether in 1, n-symmetrical diol is achieved by iodine-catalyzed reaction of the diol with dihydropyranyl ether under microwave irradiation.
Selective monotetrahydropyranylation of 1,n-diols catalyzed by aqueous acids
Nishiguchi,Hayakawa,Hirasaka,Saitoh
, p. 9843 - 9846 (2000)
1,n-Diols with 3-12 carbon atoms gave selectively the corresponding monotetrahydropyranyl ethers in higher yields than 80% in the reaction catalyzed by hydrogen ion in the water layer which is in contact with DHP-toluene or DHP-hexane layer. (C) 2000 Elsevier Science Ltd.
Highly Selective Monotetrahydropyranylation of Symmetrical Diols Catalysed by a Strongly Acidic Ion-exchange Resin
Nishiguchi, Takeshi,Kuroda, Masahumi,Saitoh, Masahiko,Nishida, Akiko,Fujisaki, Shizuo
, p. 2491 - 2492 (1995)
Several primary and secondary symmetrical diols, ranging from propane-1,3-diol to decane-1,10-diol, are selectively monoprotected by monotetrahydropyranyl ether formation catalysed by a strongly acidic ion-exchange resin (Dowex 50x x 2, 50-100 mesh) in a 3,4-dihydro-2H-pyran-hydrocarbon mixture.
Synthesis and characterization of hexadecadienyl compounds with a conjugated diene system, sex pheromone of the persimmon fruit moth and related compounds
Nishida, Takanobu,Vang, Le Van,Yamazawa, Hiroyuki,Yoshida, Ryuji,Naka, Hideshi,Tsuchida, Koji,Ando, Tetsu
, p. 822 - 829 (2003)
Hexadecadien-1-ol and the derivatives (acetate and aldehyde) with a conjugated diene system have recently been identified from a pheromone gland extract of the persimmon fruit moth (Stathmopoda masinissa), a pest insect of persimmon fruits distributed in
Preparation of monotetrahydropyranylated short-chain symmetrical diols
Petroski, Richard J.
, p. 3251 - 3259 (2003)
Efficient and robust methods for the monoprotection of 1,3-propanediol, 1,4-butanediol, and 1,5-pentanediol as THP ethers have been developed. The preparation of 4-(tetrahydro-pyran-2-yloxy)-butan-1-ol from 1,4-butanediol and 5-(tetrahydro-pyran-2-yloxy)-pentan-1-ol from 1,5-pentanediol was accomplished using a two-phase system composed of CH2Cl2. 3,4-dihydro-2H-pyran, and aqueous 0.1 N HCL. Preparation of 3-(tetrahydro-pyran-2-yloxy)-propan-1-ol from 1,3-propanediol was accomplished using a water-free biphasic mixture composed of 1,3-propanediol, catalytic pyridinium p-toluenesulfonate, 3,4-dihydro-2H-pyran, and 25% ether in hexane. The compounds are very useful three- to five-carbon homologating agents.
Photochemical E(trans)-Z(cis) isomerization in 9-anthraceneacrylic esters
Reddy, Majjigapu Janaki Ram,Srinivas, Uppalanchi,Srinivas, Kolupula,Reddy, Vummadi Venkat,Jayathirtha Rao, Vaidya
, p. 2487 - 2495 (2002)
Several (1-6) 9-anthraceneacrylic esters were synthesized in order to study photochemical E(trans)-Z(cis) isomerization. All of the compounds 1-6 underwent selective E-to-Z isomerization upon direct excitation (> 400 nm) in organic solvents, leading to the formation of a thermodynamically less stable Z isomer over 96%. Triplet sensitized isomerization selectively produces the Z-to-E isomer in over 98%. The higher quantum yield of isomerization observed in the triplet-sensitized Z-to-E isomerization process informs us that a "quantum chain" process is in operation. Fluorescence data generated on all compounds indicate that the E-to-Z isomerization process involves a charge-transfer or polar singlet excited state.
A palladium/chiral amine co-catalyzed enantioselective dynamic cascade reaction: Synthesis of polysubstituted carbocycles with a quaternary carbon stereocenter
Ma, Guangning,Afewerki, Samson,Deiana, Luca,Palo-Nieto, Carlos,Liu, Leifeng,Sun, Junliang,Ibrahem, Ismail,Cordova, Armando
, p. 6050 - 6054 (2013)
Polysubstituted 5- and 6-membered carbocycles were synthesized by the title reaction. The one-pot dynamic relay process generates four new stereocenters, including a quaternary carbon center, in a highly enantioselective fashion (99.5:0.5→99:0.5 e.r.) by using a simple combination of palladium and chiral amine co-catalysts. Copyright
Drastic fluorine effect: Complete reversal of the selectivity in the Au-catalyzed hydroalkoxylation reaction of fluorinated haloalkynes
Cloutier, Mélissa,Mamone, Marius,Paquin, Jean-Fran?ois
supporting information, p. 5969 - 5972 (2020/06/04)
The gold-catalyzed hydration reaction of haloalkynes is highly regioselective producing 2-halomethylketones as the sole products. Herein, we document a drastic fluorine effect where the reaction of 1-halo-3,3-difluoroalkynes as substrates leads to a complete reversal of selectivity and produces 3,3-difluoroesters as the unique products.
Condensed tricyclic compound and applications in medicines
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Paragraph 0670; 0672-0674, (2020/04/02)
The invention relates to a condensed tricyclic compound and applications in medicines, particularly to applications of the condensed tricyclic compound as drugs for treating and/or preventing hepatitis B, specifically to a compound represented by general
