Abstract
Fungicidal activities against phytopathogenic fungi of diarylthiazole compound of 4-[5-(2-cyclopropylaminopyrimidin-4-yl)-4-(4-fluorophenyl)thiazol-5-yl]-1-methylpiperidine (I) have been determined to be excellent and compound I was used as the leading compounds in this study. Furthermore, the compound was synthesized by reacting them with five functional groups, 4-fluoro-3-methylphenyl, 4-fluoro-3-chlorophenyl, 4-chloro-2-fluorophenyl, 4-bromo-3-methylphenyl and 2,4-dichlorophenyl groups instead of 4-fluorophenyl group. Also, 2-amino-, 2-(N-ethoxycarbonyl)piperidin-4-yl-, and 2-piperidin-4-yl-thiazole were introduced as the leads instead of 2-N-methylpiperidine-4-yl-thiazol of compound I. VIII-1~VIII-5 and XIII-1~XV-5 compounds were newly synthesized and their structures were confirmed by $^1H$-NMR-spectrum. The fungicidal activities of all the synthesized compounds against Phytophthora capsici were examined using the whole plant method. Among the VIII-1~VIII-5 and XIII-1~XV-5 chemicals, XIV-3 showed the most potent antifungal activity in vivo. While the $EC_{50}$ and $EC_{90}$ values of the commercial fungicide dimethomorph and I were $4.26{\pm}0.02$, $14.72{\pm}0.05$ and $1.01{\pm}0.11$, $6.31{\pm}0.09mM$, those of 4-[5-(2-cyclopropylaminopyrimidin-4-yl)-4-(4-chloro-2-fluorophenyl)thiazol-5-yl]-1-methylpiperidine (XIV-3) was $0.98{\pm}0.21$ and $5.85{\pm}0.05mM$. Therefore, XIV-3 can be considered as a viable candidate for the control of plant diseases caused by P. capsici, and further studies will be conducted on the mode of action XIV-3.
Diarylthiazole 화합물인 4-[5-(2-cyclopropylaminopyrimidin-4-yl)-4-(4-fluorophenyl)thiazol-5-yl]-1-methylpiperidine (I)의 식물병원균에 대한 살균활성은 우수하다고 알려져 있으며, 본 연구의 선도물질로 사용되었다. 화합물(I)의 4-fluorophenyl기 대신 4-fluoro-3-methylphenyl, 4-fluoro-3-chlorophenyl, 4-chloro-2-fluorophenyl, 4-bromo-3-methylphenyl와 2,4-dichlorophenyl기 로, 2-N-methylpiperidine-4-yl-thiazol 대신 2-amino-, 2-(N-ethoxycarbonyl)piperidin-4-yl-, and 2-piperidin-4-yl-thiazole로 치환하여 합성하였다. 새로운 VIII-1~VIII-5, XIII-1~XV-5 화합물들을 합성하였고, 1H-NMR-spectrum으로 구조를 확인하였다. Phytophthora capsici에 대한 모든 합성 화합물들의 살균활성은 whole plant법으로 시험하였고, 그 결과 VIII-1~VIII-5, XIII-1~XV-5 화합물들 중 XIV-3이 in vivo 에서 가장 우수한 살균활성을 나타내었다. 상용되고 있는 살균제인 dimethomorph와 화합물 I의 $EC_{50}$ 과 $EC_{90}$ 값이 각각 $4.26{\pm}0.02$, $14.72{\pm}0.05$와 $1.01{\pm}0.11$, $6.31{\pm}0.09mM$인 반면, 4-[5-(2-cyclopropylaminopyrimidin-4-yl)-4-(4-chloro-2-fluorophenyl)thiazol-5-yl]-1-methylpiperidine (XIV-3)은 $0.98{\pm}0.21$과 $5.85{\pm}0.05mM$을 나타내었다. 따라서, 화합물 XIV-3은 P. capsici 에 의해 발생하는 식물병에 대하여 식물보호제로서의 가능성을 보여주었으며, 화합물 XIV-3에 대한 작용 메커니즘에 대한 연구가 필요할 것이라 사료된다.
