Photochemistry of N-(benzoylimino)-1,2,4-triazolium and N-(benzoylimino)pyridinium ylides: a source of benzoylnitrene useful in photolabeling and photo-cross-linking experiments
摘要:
The photochemistry of substituted 1-(benzoylimino)pyridinium and 4-(N-benzoylimino)-1,2,4-triazolium ylides was investigated to judge their capacity to give aroylnitrenes and their suitability for use in photolabeling experiments. Evidence presented indicates that the triplet states of the ylides cleave to generate aroylnitrenes. In an attempt to enhance triplet formation, nitro- and acetyl-substituted pyridinium ylides were examined. Their irradiation does not give nitrenes in meaningful yield. However, irradiation of the triazolium ylides gives nitrenes in excellent yield. The mechanism of these reactions was probed, and additional evidence is obtained that supports the proposal that benzoylnitrene is a singlet in its ground state. The triazolium ylides may be suitable reagents for photolabeling applications.
Synthesis and photolysis of a series of substituted aroyl nitrogen ylides: development of photo-crosslinking and photolabeling reagents
作者:Masaki Kamata、Gary B. Schuster
DOI:10.1021/jo00072a010
日期:1993.9
A series of substituted nitrogen ylides was prepared to study their suitability as photolabeling agents or as photo-cross-linking agents for biological systems. Two objectives were set in the design of these reagents: first, that they have a strong absorption beyond 320 nm, and second, that they be bifunctional so that they might be linked to the biological target before activation with light. Several systems were explored by analysis of their photochemical and photophysical properties. It was discovered that a biphenyl group-containing triazolium ylide satisfies these requirements.
KATRITZKY, ALAN R.;LAURENZO, KATHLEEN S., J. ORG. CHEM., 53,(1988) N 17, 3978-3982
作者:KATRITZKY, ALAN R.、LAURENZO, KATHLEEN S.
DOI:——
日期:——
Alkylaminonitrobenzenes by vicarious nucleophilic amination with 4-(alkylamino)-1,2,4-triazoles
作者:Alan R. Katritzky、Kathleen S. Laurenzo
DOI:10.1021/jo00252a018
日期:1988.8
Photochemistry of N-(benzoylimino)-1,2,4-triazolium and N-(benzoylimino)pyridinium ylides: a source of benzoylnitrene useful in photolabeling and photo-cross-linking experiments
作者:Charles R. Arnold、Tracy Melvin、William M. Nelson、Gary B. Schuster
DOI:10.1021/jo00038a017
日期:1992.6
The photochemistry of substituted 1-(benzoylimino)pyridinium and 4-(N-benzoylimino)-1,2,4-triazolium ylides was investigated to judge their capacity to give aroylnitrenes and their suitability for use in photolabeling experiments. Evidence presented indicates that the triplet states of the ylides cleave to generate aroylnitrenes. In an attempt to enhance triplet formation, nitro- and acetyl-substituted pyridinium ylides were examined. Their irradiation does not give nitrenes in meaningful yield. However, irradiation of the triazolium ylides gives nitrenes in excellent yield. The mechanism of these reactions was probed, and additional evidence is obtained that supports the proposal that benzoylnitrene is a singlet in its ground state. The triazolium ylides may be suitable reagents for photolabeling applications.