From mutagenic to non-mutagenic nitroarenes: effect of bulky alkyl substituents on the mutagenic activity of 4-nitrobiphenyl in Salmonella typhimurium
作者:Markus Klein、Ulrike Voigtmann、Torsten Haack、Lothar Erdinger、Gernot Boche
DOI:10.1016/s1383-5718(00)00012-7
日期:2000.4
This reduction of mutagenicity is correlated with deviations from the coplanar orientation of the nitro group relative to the aromatic plane. Since a comparable decrease of mutagenicity for the nitroso compounds (4NOBp and 3-tertbutyl-4NOBp) was not observed, the first reduction step of non-planar nitro groups must be inhibited. Alkyl groups in the 2'-position of 4NBp (2'-methyl-, 2'-ethyl-, 2'-isopropyl-
合成了11种烷基取代的4-硝基联苯(4NBp)和两种相应的亚硝基化合物,并测试了鼠伤寒沙门氏菌TA98和TA100菌株的诱变能力。邻位被硝基取代的化合物的诱变性(3-甲基-,3-乙基-,3-异丙基-,3-叔丁基-,3、5-二乙基-,3,5-二异丙基-和3,5-在两个测试菌株中,随着烷基取代基的空间需求的增长,二叔丁基-4NBp)降低。受空间影响最大的化合物即使在最高浓度下也不会引起突变。致突变性的降低与硝基相对于芳族平面的共面取向的偏离有关。由于未观察到亚硝基化合物(4NOBp和3-叔丁基-4NOBp)致突变性的可比下降,必须抑制非平面硝基的第一步还原。4NBp(2'-甲基-,2'-乙基-,2'-异丙基和2',4',6'-三甲基-4NBp)2'-位处的烷基也随着大小的增加而降低了诱变活性并将其完全清除掉,成为受空间最大阻碍的物种(2'-异丙基-,2',4',6'-三甲基-4NBp)。在