18138-86-8Relevant academic research and scientific papers
One-Step Synthesis of Triphenylphosphonium Salts from (Het)arylmethyl Alcohols
Abaev, Vladimir T.,Chalikidi, Petrakis N.,Demidov, Oleg P.,Gutnov, Andrey V.,Magkoev, Taimuraz T.,Trushkov, Igor V.,Uchuskin, Maxim G.
, p. 9838 - 9846 (2021/07/28)
Two approaches for the synthesis of substituted phosphonium salts from easily available benzyl alcohols and their heterocyclic analogs have been developed. The developed protocols are complementary: the direct mixing of alcohol, trimethylsilyl bromide, and triphenylphosphine in 1,4-dioxane followed by heating at 80 °C was found to be more efficient for acid-sensitive substrates, such as salicyl or furfuryl alcohols as well as secondary benzyl alcohols, while a one-pot procedure including sequential addition of trimethylsilyl bromide and triphenylphosphine gave higher yields for benzyl alcohols bearing electroneutral or electron-withdrawing substituents.
Ruthenium-Catalyzed Asymmetric Allylic Alkylation of Isatins
Kalnmals, Christopher A.,Parkin, Sean,Ramakrishnan, Divya,Ryan, Michael C.,Smaha, Rebecca W.,Trost, Barry M.
supporting information, (2020/04/02)
A new ruthenium-based catalytic system for branched-selective asymmetric allylic alkylation is disclosed and applied to the synthesis of chiral isatin derivatives. The catalyst, which is generated in situ from commercially available CpRu(MeCN)3PF6 and a BINOL-derived phosphoramidite, is both highly active (TON up to 180) and insensitive to air and moisture. Additionally, the N-alkylated isatins accessible using this methodology are versatile building blocks that are readily transformed into chiral analogs of achiral drug molecules.
EFFLUX-PUMP INHIBITORS AND THERAPEUTIC USES THEREOF
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Page/Page column 180, (2016/12/26)
The present invention relates to compounds of formula I or pharmaceutically acceptable salt, solvate or hydrate thereof, wherein ASC is -N(R8)(R9)ASC-1 ASC-1 is Ring A represents a 4- to 6-membered saturated ring containing carbon atoms as ring members in addition to the nitrogen atom and wherein one CH2 moiety in ring A is optionally replaced by CH(R21) and wherein one carbon atom in ring A that is not adjacent to the nitrogen atom is optionally replaced by O, and wherein ring A is connected to X via a carbon atom; X represents a bond, -CH2- or -C(=O)-; ARl, AR2 represent independently phenyl or a 5- to 6- membered heteroaryl ring containing one to three heteroatoms selected from O, S and N, wherein AR1 is connected to LI via a carbon atom, and wherein AR2 is connected to L1 and L2 via a carbon atom; R1, R2, R3 represent independently hydrogen, halogen, cyano, hydroxyl, C1-C6alkyl, C1-C6haloalkyl, C3- C8cycloalkyl, C1-C6alkoxy, C1-C6haloalkoxy, -C1-C6alkylene-N(R12)R13, -N(R12)R13, -C(O)OR11l, - C(O)N(R12)R13, -S(O)OR11 or phenyl; R4 represents hydroxyl, hydrogen, halogen, nitro, cyano, amino, C1-C6alkyl optionally substituted by 1 to 5 R14, C2-C6alkenyl optionally substituted by 1 to 5 R14, C2-C6alkynyl optionally substituted by 1 to 5 R14, C1-C6alkoxy optionally substituted by 1 to 5 R14, C2-C6alkenyloxy optionally substituted by 1 to 5 R14, C2-C6alkynyloxy optionally substituted by 1 to 5 R14, -C(O)OR15, -CHO, -C(O)N(R16)R17, -C1- C6alkylene-N(R9)(R16)R17, -O-Cycle-P or -O-Cycle-Q; R5, R6, R7 represent independently hydrogen, halogen, cyano, Cl-C6alkyl, C1-C6haloalkyl, Cl-C6alkoxy or C1-C6haloalkoxy; R8 represents hydrogen, methyl or ASC-1; R9 is methyl or absent, and wherein when R9 is present the respective nitrogen atom carries a positive charge; R10 represents hydrogen or methyl; Rl11 represents independently at each occurrence hydrogen or C1-C6alkyl; R12, R13 represent independently at each occurrence hydrogen or C1-C6alkyl; R14 represents independently at each occurrence halogen, cyano, hydroxyl, C1-C6alkoxy, C1-C6haloalkoxy, C3-C8cycloalkyl, -C(O)OR11, -CHO, -C(O)N(R12)R13, -C1-C6alkylene-N(R12)R13, Cycle-P, O-Cycle-P, Cycle-Q or O-Cycle-Q; Cycle-P represents independently at each occurrence a saturated or partially unsaturated C3-C8 carbocyclic ring optionally substituted by 1 to 3 R18, or a saturated or partially unsaturated C3-C8 heterocyclic ring optionally substituted by 1 to 3 Rl 8 containing carbon atoms as ring members and one or two ring members independently selected from N(R9)(R12), N(R9) and O; Cycle-Q represents independently at each occurrence phenyl optionally substituted by 1 to 3 R19 or a 5- to 6-membered heteroaryl ring containing one to four heteroatoms selected from O, S and N, optionally substituted by 1 to 3 R19; R15 represents independently at each occurrence hydrogen or C1-C6alkyl optionally substituted by 1 to 5 R14; R16 and R17 represent independently at each occurrence hydrogen or C1-C6alkyl optionally substituted by 1 to 5 R14; R18 and R19 represent independently at each occurrence halogen, cyano, hydroxyl, oxo, amino, C1-C4alkyl, C1-C4haloalkyl, C1-C4alkoxy, Cl-C4haloalkoxy or -CO(O)R11; R20 represents independently at each occurrence hydrogen or methyl; R21 represents N(R20)2 or CH2-N(R20)2; LI represents -CH=CH-, -CH2-O-, -O-CH2-, -CH2-O-CH2-,-CH2-S-, -S-CH2-, -CH2-S(O)-, -CH2-S(O2)-, -S(O)-CH2-; -S(O2)-CH2-, -C(CH3)(CH3)-, -C(=O)-NH-, -NH-C(=O)-, -CH2-CH2-, -CH=CH-CH2-, - CH2-NH-C(=O)-, -C(=O)-NH-CH2, -C≡C-, -S(O2)-NH-CH2-, -S(02)-NH, -O-CH2-CH2-O-, -O-, -NH- CH2-, -CH2-NH-, -CH2-CH2-O-, or -NH-C(=O)-CH2-O-, or a bond; L2 represents Cl-C7alkylene, wherein one or more CH2 moieties in the alkylene are optionally replaced independently by -N(R9)(R20)-, -CH(N(R9)(R20)(R20))-, or -C(=0)-, wherein within L2 there are no adjacent C(=O) moieties or adjacent -N(R9)(R20)- moieties, and wherein the terminal moiety of L2 is not - N(R9)(R20)-, or L2 represents -O-C1-C6alkylene-, or L2 represents a bond, providing that X represents - CH2- when L2 is a bond; as well as methods of using the compounds of formula I for treating or preventing bacterial infections.
Synthesis, spectral properties and photobehaviour of push-pull distyrylbenzene nitro-derivatives
Kika?,Carlotti,?kori?,?indler-Kulyk,Mazzucato,Spalletti
experimental part, p. 38 - 46 (2012/09/10)
Six novel asymmetric 2,5-distyryl-furan, 2,5-distyryl-thiophene and 2,6-distyrylpyridine derivatives, bearing an electron acceptor (p-nitro) group at one side and an electron donor (p-methoxy or p-dimethylamino) group at the other side, have been prepared. The experimental absorption properties have been measured and compared with the computed parameters. Theoretical and experimental results indicate that one conformational isomer (the compressed one) is largely prevalent in all compounds. The measured radiative and reactive relaxation properties of these donor/acceptor disubstituted compounds were also compared with those of the unsubstituted analogues previously investigated. The presence of the donor/acceptor groups leads to a significant increase of the charge transfer character of both the ground and the excited states and to strong red shifts of the absorption spectra, an effect that can be useful for potential applications in material science. The fluorescence/photoisomerization competition of the furan and thiophene derivatives was found to be rather similar to that of the unsubstituted analogues whereas significant changes were found for the pyridine derivatives where a drastic decrease of fluorescence, a sizable increase of photoisomerization and a predominance of radiationless deactivation to the ground state becomes operative.
