22323-82-6Relevant articles and documents
Efficient resolution of rac-2,3-O-isopropylideneglycerol by enantioselective inclusion crystallization with the chiral diol CYTOL
Vinogradov, Maxim G.,Kurilov, Dmitry V.,Ferapontov, Vladimir A.,Heise, Glenn L.
, p. 125 - 126 (2003)
The efficient resolution of rac-2,3-O-isopropylideneglycerol (IPG) using enantioselective two-step inclusion crystallization with the chiral diol CYTOL has been performed.
Synthesis and antimicrobial screening of novel 1,3-dioxolanes linked to N-5 of 5H-1,2,4-triazino[5,6-b]indole-3-thiol
Ramadan, El Sayed,Rasheed, Hanaa A.,El Ashry, El Sayed H.
, p. 1 - 10 (2019/05/14)
Synthesis of 1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-1H-indole-2,3-dione (10) was achieved by coupling 1H-indole-2,3-dione (16) with (R)-(2,2-dimethyl-1,3-dioxolan-4-yl)methyl 4-methylbenzenesulfonate (15) in the presence of sodium hydride in dry N,N-dimethylformamide at room temperature in a closed Erlenmeyer flask. Condensation of 10 with hydrazinecarbothioamide in water afforded the thiosemicarbazone derivative 17; its subsequent cyclization with potassium carbonate in water gave the corresponding thione 18 in good yield. The 3-allylthio and 3-benzylthio derivatives 20 and 21 were also prepared by alkylating thiol 19 with alkyl halides in aqueous sodium hydroxide or coupling of 3-(allylthio/benzylthio)-5H-1,2,4-triazino[5,6-b]indoles (23 and 24) with compound 15 in NaH/DMF. Compound 20 was isomerized to a mixture of geometrical isomers (E/Z)-5-[(2,2-dimethyl-1,3-dioxolan-4-yl)-methyl]-3-(prop-1-en-1-ylthio)-5H-1,2,4-triazino[5,6-b]indoles (25 and 26), evidenced by their 1H- and 13C-NMR spectra taken in deuterodimethyl sulfoxide. Structural elucidation of the synthesized compounds was realized using FT-IR, 1H-NMR, 13C-NMR, mass spectrometry and elemental analysis. The newly synthesized compounds were found to possess moderate inhibitory activity against the fungus Candida albicans compared to clotrimazole as reference control. Compounds 10, 17, 19, 20, 21, 23 and 24 had mean growth inhibition zones (IZ) and minimal inhibitory concentrations (MIC) in the range of 12–15 mm and 31.25–200 μg mL-1, respectively, with inhibition levels in the range 70.58–88.23 %. Compound 19 exhibited moderate activity against Gram-positive bacteria Staphylococcus aureus relative to imipenem as the standard drug. All compounds were inactive against Escherichia coli and Pseudomonas aeruginosa.
Enzyme-Mediated Directional Transport of a Small-Molecule Walker with Chemically Identical Feet
Martin, Christopher J.,Lee, Alan T. L.,Adams, Ralph W.,Leigh, David A.
supporting information, p. 11998 - 112002 (2017/09/07)
We describe a small-molecule "walker" that uses enzyme catalysis to discriminate between the relative positions of its "feet" on a track and thereby move with net directionality. The bipedal walker has identical carboxylic acid feet, and "steps" along an isotactic hydroxyl-group-derivatized polyether track by the formation/breakage of ester linkages. Lipase AS catalyzes the selective hydrolysis of the rear foot of macrocyclized walkers (an information ratchet mechanism), the rear foot producing an (R)-stereocenter at its point of attachment to the track. If the hydrolyzed foot reattaches to the track in front of the bound foot it forms an (S)-stereocenter, which is resistant to enzymatic hydrolysis. Only macrocyclic walker-track conjugates are efficiently hydrolyzed by the enzyme, leading to high processivity of the walker movement along the track. Conventional chemical reagents promote formation of the ester bonds between the walker and the track. Iterative macrocyclization and hydrolysis reactions lead to 68% of walkers taking two steps directionally along a three-foothold track.
