作者:Mohammad Sayed Alam、Lijun Liu、Dong Ung Lee
DOI:10.1248/cpb.59.1413
日期:——
A series of 5-phenyl-4,5-dihydro-1,3,4-thiadiazoles were synthesized and their cytotoxicity was examined against four human cancer cell lines, e.g. lung cancer (A549), ovarian cancer (SK-OV-3), skin cancer (SK-MEL-2), and colon cancer (HCT15). The title compounds were synthesized by condensation of thiosemicarbazide with substituted benzaldehydes, followed by cyclization with acetic anhydrides in good yields. Most of the compounds exhibited significant suppressive activity against the growth of all of the cancer cell lines. The 4-hydroxy analogue of 5-phenyl-4,5-dihydro-1,3,4-thiadiazole (2h) was most active in the inhibition of growth of the SK-MEL-2 cell line, with an IC50 value of 4.27 μg/ml; followed by compound 2a (IC50 5.16 μg/ml). The compounds 2j, 2h, and 2b, bearing 3-methoxy-4-hydroxy-, 4-hydroxy- and 4-methyl substituents in the C-5 phenyl ring respectively, exhibited the highest activity against the SK-OV-3 (IC50 7.35 μg/ml), HCT15 (IC50 8.25 μg/ml) and A549 (IC50 9.40 μg/ml) cell lines, respectively. A structure–activity relationship study revealed that an optimal electron density on the C-5 phenyl ring of 1,3,4-thiadiazoles is crucial for their cytotoxic activity against the human cancer cell lines used in the present study.
一系列5-苯基-4,5-二氢-1,3,4-噻二唑被合成并对四种人癌细胞系(例如肺癌(A549)、卵巢癌(SK-OV-3)、皮肤癌(SK-MEL-2)和结肠癌(HCT15))进行了细胞毒性测试。标题化合物通过硫脲与取代苯甲醛的缩合反应合成,随后用乙酸酐环化得到良好产率。大多数化合物对所有癌细胞系的生长表现出显著抑制活性。5-苯基-4,5-二氢-1,3,4-噻二唑的4-羟基类似物(2h)在抑制SK-MEL-2细胞生长方面活性最高,IC50值为4.27 μg/ml;其次是化合物2a(IC50 5.16 μg/ml)。化合物2j、2h和2b分别在C-5苯环上具有3-甲氧基-4-羟基、4-羟基和4-甲基取代基,它们对SK-OV-3(IC50 7.35 μg/ml)、HCT15(IC50 8.25 μg/ml)和A549(IC50 9.40 μg/ml)细胞系表现出最高活性。结构-活性关系研究揭示,1,3,4-噻二唑C-5苯环上的最佳电子密度对本研究中使用的人癌细胞系的细胞毒性活性至关重要。