The intramolecular electrophilic cyclization of alkynes with disulfides to form thieno[2,3–b]quinoxaline structures and to introduce thioether substituents afforded quinoxaline derivatives (7a-7d, 8a-8d). Among obtained eight derivatives, the raloxifene analogues (7c, 8b) showed specifically high cytotoxicity against breast cancer cells (SK-BR-3), and raloxifene analogues (8a) showed the highest cytotoxicity
炔烃与二
硫化物的分子内亲电环化形成
噻吩并[2,3- b ]
喹喔啉结构并引入
硫醚取代基,得到
喹喔啉衍
生物(7a - 7d,8a - 8d)。在获得的八种衍
生物中,
雷洛昔芬类似物(7c,8b)对乳腺癌细胞(SK-BR-3)表现出特别高的细胞毒性,
雷洛昔芬类似物(8a)对人白血病细胞(HL-60)表现出最高的细胞毒性。
雷洛昔芬类似物(7a - 7d、8a - 8d)均未表现出针对人肺成纤维细胞(WI-38)(正常细胞)的细胞毒性。