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H L Pan

Publications and source records attributed to H L Pan.

65 records · Page 4Linked to original sources
PubMed1980

New compounds: derivatives of fluorene XXXVII: 9-substituted 3-nitrofluorenes.

New 9-substituted 3-nitrofluorenes were prepared as potential intermediates in a study of modified electrophilicity and mutagenicity of the carcinogen 3-N,O-diacetylhydroxylaminofluorene. The reported derivatives, together with some already known 9-substituted 3-nitrofluorenes, were too unstable to survive the reducing conditions required to transform the nitro group to the corresponding hydroxylamine.

Carcinogens↗
PubMed1980

New 9-stubstituted 3-N,O-diacetylhydroxylaminofluorenes: enhanced electrophilicity and mutagenicity. Derivatives of fluorene. 38.

The compound 2-acetamidofluorene is a potent hepatocarcinogen; its N-acetoxy derivative (2-NOAc-AAF), a model ultimate form of the carcinogen, is strongly mutagenic and is chemically reactive with nucleophiles. The isomeric 3-acetamidofluorene is a mammary carcinogen, but is not hepatocarinogenic; its N-acetoxy derivative (3-NOAc-AAF) is not reactive with nucleophiles. Derivatives of 3-NOAc-AAF containing electron-donating groups in positions conjugated with the 3-position have been synthesized. These show increased electrophilicity and mutagenicity. Thus, by electronic manipulation of the leaving-group capacity of the -OAc group of 3-NOAc-AAF, we have obtained compounds with increased biological activity, as well as increased chemical reactivity. Future experiments could show whether in vivo effects of these derivatives of 3-NOAc-AAF are more like the effects of 2-NOAc-AAF or of 3-NOAc-AAF.

2-Acetylaminofluorene↗