Quantitative structure-activity relationship of the mutagenicity of substituted N-nitroso-N-benzylmethylamines: possible implications for carcinogenicity
摘要:
The relative mutagenicities of substituted N-nitroso-N-benzylmethylamines have been reexamined from a quantitative structure-activity relationship point of view. Most of the compounds were mutagenic toward Salmonella typhimurium TA 1535 with Aroclor-induced male hamster liver S9 activation. The dose-response data were subjected to a multiple linear regression equation calculated in a stepwise manner, which found that the differences in mutagenicities could be explained primarily by differences in the three-bond path molecular connectivity index, with smaller contributions from sigma and pi. Moreover, a polynomial regression analysis showed that the maximum mutagenicity could be explained by an optimal amount of electron withdrawal by the substituent which would cause a weakening, or activation, of the methylene C-H bond. The possible relevance of these observations to carcinogenesis is discussed.
single and dual reductiveamination followed by N-methylation of aldehydes and ketones to synthesize N,N-dimethyl as well as N-methyl tertiary amines, respectively, utilizing ammonium formate and methanol as N1 and C1 sources is reported. The protocol was efficiently extended to a tandem reductiveamination/N-methylation/cyclization of keto acids/esters leading to N-methyl lactams. A broad substrate