• Bulletin of the Korean Chemical Society
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• 제30권3호
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• pp.691-694
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• 2009

Pauson-Khand reaction of hydroxyenynes with $Co_2(CO)_8$ in the presence of N-methylmorpholine N-oxide or trimethylamine N-oxide as a promoter produced polycyclic $gamma$-lactams as single stereoisomers in moderate to excellent yield. These are the first examples of an intramolecular Pauson-Khand reaction on a hydroxyenyne system tethered to a three- and four-membered ring as new skeletons with 5,6,5 fused ring systems.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.363.2-363.2
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• 2002

A number of 2',3'-deoxynucleosides have been discovered to possess significant antiviral activity against HIV-1 and other viruses. Since it has been suggested that proper conformation of the dideoxynucleosides in terms of ring puckering of the five-membered sugar moiety is required for them to exhibit antiviral activity a number of nucleoside analogues to fix sugar-ring puckering have been synthesize and evaluated for antiviral activity. (omitted)

• 약학회지
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• 제35권4호
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• pp.283-287
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• 1991

Seven derivatives of 2,3-alkyl substituted N-cyanoaziridine were stereoselectively prepared from alkyl substituted alkenes and cyanamide. NMR spectral property and conformation of N-cyanoaziridine were analysed. Protons(3.34 ppm) at 2,3 position of N-cyanoaziridines are significantly deshielded in case of cyclopentyl fused N-cyanoaziridine. These protons are getting more anisotropically shielded with increasing the fused carbocycle size of N-cyanoaziridine. Therefore chemical shift for these protons are upfield shifted to 2.80 ppm in case of cyclooctyl fused N-cyanoaziridine. Their ED$_{50}$ values aganist L$_{1210}$, cell in vitro were evaluated as 0.5~8.0 $\mu$g/ml. Conformation of carbocycle of fused N-cyanoaziridine is more important to their cytotoxicity than the increment of the strain energy of 3-membered ring.

• 대한수학회지
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• 제52권5호
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• pp.929-944
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• 2015

We give a quotient of the ring ${\mathbb{Q}}[A^{{\pm}1},\;t^{{\pm}1]$ so that the Miyazawa polynomial is a non-trivial invariant of welded links. Furthermore we show that this is also an invariant under the other forbidden move $F_u$, and so it is a fused isotopy invariant. Also, we give some quotient ring so that the index polynomial can be an invariant for welded links.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.331-335
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• 2002

Excellent organic electroluminescent materials are needed to realize color EL devices with high performance. We have succeeded in realizing bright and efficient devices with long lifetime in red and white color regions, based on a new fused aromatic ring derivative.

• Bulletin of the Korean Chemical Society
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• 제27권12호
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• pp.2051-2054
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• 2006

The molecular structures of the ground and lowest triplet states of 2,3-diazabicyclo[2.2.1]hept-2-ene (DBH), 2,3-diazabicyclo[2.2.2]oct-2-ene (DBO) and their fused ring derivatives are investigated with an ab initio method and the density functional theory. Unlike the singlet DBH and DBO, the azo skeletal structures of the triplet counterparts are turned out to be quite sensitive to the change of the electronic structure of the fused ring. The B3LYP C-N=N-C dihedral angles of the triplet DBH and DBO are estimated to be about 28.0 and $40.4{^{\circ}}$, respectively. The B3LYP singlet-triplet energy gaps for DBH and DBO are predicted to be 58.4 and 48.4 kcal/mol, respectively. The triplet state energy can be lowered drastically by the presence of the remote $\Pi-\Pi$ interaction as in the case of 1bb'.

• Bulletin of the Korean Chemical Society
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• 제23권8호
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• pp.1053-1054
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• 2002

• Bulletin of the Korean Chemical Society
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• 제31권3호
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• pp.704-707
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• 2010

• Archives of Pharmacal Research
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• 제13권1호
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• pp.97-100
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• 1990

A convenient route is reported for the synthesis of fused pyrrolo [2, 3-d][1, 3]-oxazine and pyrrolo [2, 3-d]-pyrimidine derivatives from 2-amino-1-benzyl-3-t-butoxy-carbonyl-4, 5-dimethylpyrrole.

• 한국광과학회:학술대회논문집
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• 한국광과학회 1999년도 학술대회지
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• pp.68-69
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• 1999