Acylation of Meldrum’s acid with arylacetic acid imidazolides as a convenient method for the synthesis of 4-aryl-3-oxobutanoates
作者:A. A. Shimkin、V. Z. Shirinian、A. K. Mailian、D. V. Lonshakov、V. V. Gorokhov、M. M. Krayushkin
DOI:10.1007/s11172-011-0019-9
日期:2011.1
C-Acylation of Meldrum’s acid by (het)arylacetic acids in ethanol in the presence of 1,1′-carbonyldiimidazole leads to ethyl 4-(het)aryl-3-oxobutanoates in high yields.
DNA−Protein Cross-Linking: Model Systems for Pyrimidine−Aromatic Amino Acid Cross-Linking
作者:Guangxing Sun、Christopher J. Fecko、Robert B. Nicewonger、Watt W. Webb、Tadhg P. Begley
DOI:10.1021/ol052876m
日期:2006.2.1
We have synthesized simple model systems to explore the possibility of photo-cross-linking between the pyrimidine bases and the side chains of the aromatic amino acids. Thymine/phenylalanine and thymine/tyrosine models gave cross-links, and thymine/tryptophan models gave complex mixtures; the cytosine/phenylalanine model was unreactive. The quantum yields for the model cross-linking reactions were 18-46 times smaller than those for thymine dimer formation. Biphotonic excitation contributes little to the yield of these reactions.