Cytosine Derivatives Form Hemiprotonated Dimers in Solution and the Gas Phase
作者:Aaron R. Moehlig、Katherine E. Djernes、V. Mahesh Krishnan、Richard J. Hooley
DOI:10.1021/ol300861r
日期:2012.5.18
Hemiprotonated dimers of cytosine derivatives, implicated in the formation of the i-motif of DNA, have been created in solution and the gas phase. The mechanism of dimerization has been analyzed by mass spectrometry and multidimensional NMR spectroscopy.
Cytosine modules in quadruple hydrogen bonded arrays
作者:Elisabetta Greco、Abil E. Aliev、Valerie G. H. Lafitte、Kason Bala、David Duncan、Laura Pilon、Peter Golding、Helen C. Hailes
DOI:10.1039/c0nj00197j
日期:——
Cytosine modules have been investigated for applications in supramolecular quadruple hydrogen bonded arrays. Notably, the importance of the C-5–H in the formation of unfolded and folded arrays by substitution to C-5–F was established. In addition, the incorporation of different alkyl chain lengths at N-1 and N-9 indicated that longer alkyl chains give rise to more of the unfolded rotamer, with the chain length and degree of unsaturation at N-1 having the major effect. Methyl cytosine modules were also able to readily form hetero-associated Upy–UCyt dimers as efficiently as the hexyl cytosine modules and a polyadipate telechelic polymer was used to prepare cytosine polymers.