Katsuyuki Ogura

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On treatment with an organoaluminum reagent such as trimethylaluminum or DIBAL-H, gamma-hydroxy-alpha-fluoro-alpha-trifluoromethyl carboxamides (1) give a single diastereomer of alpha-amino-alpha-trifluoromethyl-gamma-lactones (2), which are a ring-closed form of gamma-hydroxy-alpha-trifluoromethyl-alpha-amino acids. This intriguing reaction results from(More)
Instead of the lock-and-key model, current understanding of molecular recognition in a biological system is based on the "induced-fit'' mechanism, in which specific substrates induce the organization of the recognition site of a receptor. Although models for induced-fit have been provided by flexible artificial hosts which have restricted conformations only(More)
A simple dipeptide, (S)-phenylglycyl-(R)-phenylglycine (S,R-1), formed inclusion compounds with a small amide such as formamide, acetamide, N,N-dimethylformamide (DMF), or N,N-dimethylacetamide. By single-crystal X-ray analysis, the inclusion compounds were shown to have a wavy layer structure. The molecules of S,R-1 are arranged in parallel via ionic(More)
In terms of chiral recognition for racemic aryl methyl sulfoxides in the solid state, three kinds of crystalline (S)-alkylglycyl-(S)-phenylglycines were examined as potential dipeptides host molecules. When (S)-alanyl-(S)-phenylglycines [(S,S)-Ala-Phg] crystallized with aryl methyl sulfoxides, the stereochemistry of preferentially included sulfoxides(More)
The reaction of (1E,3E)-1-(methylthio)-3-tosylhexa-1,3-dien-5-ynes (3) with iodine to form iodine-substituted benzenes (4) is reported. The reaction of 3 with iodine proceeded very slowly, but UV irradiation accelerates the reaction to give 4 in high-to-excellent yields. Irradiation induces the cis-trans isomerization of the C1-C2 double bond, leading to(More)
For the expansion of a rectangular cavity (RC) defined by two isonicotinic acid (isoH) dimers as bridging ligands and two SCN bridges, we conducted a structural extension based on the elongation of the bridging ligands by the replacement of isoH with longer 4-pyridyl-substituted carboxylic acid (PCA). For this purpose, the following three PCAs have been(More)
The synthesis, crystal structures, inclusion ability, and structural robustness of novel crystalline inclusion compounds of [Ni(SCN)2(isoH)2].xG (isoH = isonicotinic acid; G = aromatic guest) are described. The inclusion compounds are constructed by stacking identical 2D host layers that consist of SCN-, isoH, and Ni2+ with van der Waals contact separation.(More)
A novel pi-conjugated organic compound, 1-phenyl-2,5-bis[5-(tricyanoethenyl)-2-thienyl]pyrrole, which bears two powerful electron-withdrawing tricyanoethenyl substitutents, readily yielded gold-like metal-lustrous inclusion crystals with a series of aromatic guest molecules such as toluene, p-xylene, anisole, dimethoxybenzenes and indene. All the inclusion(More)
The Paraoh's ant, Monomorium pharaonis is an urban pest of tropical origin. The trail pheromone of this ant, by the name of faranal, has been shown to be (3S,4R,6E, lOZ)-3,4,7,1l-tetramethyltrideca-6,10-dienal (1) [1-4]. The 3-epimer (3R,4R) also shows a weak pheromone activity when tested separately, though the preference of the ants for 1 is unambiguous(More)
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