A Conformationally Defined 6-s-trans-Retinoic Acid Isomer: Synthesis, Chemopreventive Activity, and Toxicity
作者:Michael F. Vaezi、Muzaffar Alam、Brahma P. Sani、Tina S. Rogers、Linda Simpson-Herren、John J. Wille、Donald L. Hill、Thomas I. Doran、Wayne J. Brouillette、Donald D. Muccio
DOI:10.1021/jm00052a009
日期:1994.12
the intermediate aldehyde. A Horners-Emmons condensation with this aldehyde then produced retinoic acid analogs with both 9Z- and 9Z,13Z-configurations. An I2-catalyzed isomerization of the intermediate 9Z-aldehyde yielded the all-E-aldehyde, which was olefinated as above to yield the (all-E)- and (13Z)-retinoic acid analogs of 1. Each configurational isomer of 1 was evaluated for its ability to inhibit
合成了构象确定的视黄酸类似物(1),其包含二亚甲基桥以维持多烯链中两个末端双键的6-s-反式取向。利用Reformatsky反应扩展了起始烯酮的多烯链,这为中间醛仅提供了9Z构型。然后用该醛进行霍纳斯-埃蒙斯缩合反应,生成具有9Z-和9Z,13Z-构型的视黄酸类似物。中间体9Z-醛经I2催化的异构化反应生成了全E-醛,该醛如上所述进行了烯化反应,生成了1的(全E)-和(13Z)-视黄酸类似物。评估了1的每种构型异构体抑制视黄酸与CRABP(小鸡皮肤)结合以及抑制小鼠皮肤中鸟氨酸脱羧酶化学诱导的能力。在每种测定中,(all-E)-1是活性最高的异构体,并且该活性与(all-E)-视黄酸相当或更好。(all-E)-1和(13Z)-1在体外抑制人皮脂细胞增殖方面均与(13Z)-视黄酸同等有效。进一步评估了(all-E)-1在小鼠中诱导小鼠皮肤乳头状瘤和诱导维生素A毒性迹象的能力。(all-E)-