Hyo Chang Cha

Yeungnam University, Onyang, South Chungcheong, South Korea

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Publications (2)3.85 Total impact

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    ABSTRACT: A new procedure for the preparation of emodin carbaldehyde and citreorosein was described, in which, ω,ω'-dibromomethylemodin triacetate was prepared as a key intermediate by NBSmediated bromination of 1,3,8-triacetylemodin. Reduction of emodin and citreorosein with SnCl(2) in a 1:1 mixture of HOAc and HCl afforded the corresponding anthrones in 90% and 92% yield, respectively, while the corresponding 10-desoxyemodin carbaldehyde was prepared by MnO(2) oxidation of 10-desoxycitreorosein. 10-Desoxycitreorosein and emodin carbaldehyde showed feasible μ-calpain inhibitory activities with IC(50) values of 20.15 and 25.77 M, respectively.
    Archives of Pharmacal Research 03/2012; 35(3):447-54. DOI:10.1007/s12272-012-0307-4 · 1.75 Impact Factor
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    Jing Lu Liang, Hyo Chang Cha, Yurngdong Jahng
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    ABSTRACT: Luotonins are alkaloids from the aerial parts of Peganum nigellastrum Bunge. that display three major skeleton types. Luotonins A, B, and E are pyrroloquinazolino-quinoline alkaloids, luotonins C and D are canthin-6-one alkaloids, and luotonin F is a 4(3H)-quinazolinone alkaloid. All six luotonins have shown promising cytotoxicities towards selected human cancer cell lines, especially against leukemia P-388 cells. Luotonin A is the most active one, with its activity stemming from topoisomerase I-dependent DNA-cleavage. Such intriguing biological activities and unique structures have led not only to the development of synthetic methods for the efficient synthesis of these compounds, but also to interest in structural modifications for improving the biological properties. Recent progress in the study of luotonins is covered.
    Molecules 12/2011; 16(6):4861-83. DOI:10.3390/molecules16064861 · 2.10 Impact Factor