Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/8364

TitlePyrenylamino acids : synthesis, photophysical and electrochemical studies
Author(s)Abreu, Ana S.
Castanheira, Elisabete M. S.
Ferreira, Paula M. T.
Monteiro, Luís S.
Pereira, Goreti
Queiroz, Maria João R. P.
KeywordsDehydroamino acids
Pyrene
Suzuki cross-coupling
Cyclic voltammetry
Fluorescence
Cross-coupling
Issue dateDec-2008
PublisherWiley
JournalEuropean Journal of Organic Chemistry
CitationABREU, Ana S. ; CASTANHEIRA, Elisabete M. S. ; FERREIRA, Paula M. T. [et al.] - Pyrenylamino acids : synthesis, photophysical and electrochemical studies. “European Journal of Organic Chemistry” [Em linha]. 28:34 (Dec. 2008) 5697-5703. [Consult. 25 de Nov. 2008]. Disponível em WWW:<URL:http://www3.interscience.wiley.com/cgi-bin/fulltext/121476839/PDFSTART>. ISSN 1099-0690.
Abstract(s)Several beta-pyrenyldehydroamino acids and a pyrenylalanine derivative were synthesized in good to high yields from dehydroamino acids using several types of reactions. A beta-[(pyren-1-yl)methylamino]alanine was prepared treating the methyl ester of N,N-(di-tert-butoxycarbonyl)dehydroalanine with 1-pyrenemethylamine hydrochloride in the presence of an excess of potassium carbonate. The methyl esters of N-(tert-butoxycarbonyl)-beta-(1,2,4-triazol-1-yl) dehydroalanine and dehydroaminobutyric acid were reacted with 1-pyrenemethylamine hydrochloride in the presence of triethylamine to give the E-isomers of the beta-aminomethylpyrene dehydroalanine and dehydroaminobutyric acid derivatives in 84% and 45% yield, respectively. Beta-(Pyren-1-yl) dehydrophenylalanine and dehydroaminobutyric acid derivatives were obtained from the pure stereoisomers of the corresponding beta-bromodehydroamino acids and 1-pyrene boronic acid using Suzuki cross-couplings. This reaction was also applied successfully to beta-bromodehydrodipeptides. The electrochemical behaviour of some of the compounds prepared was studied by cyclic voltammetry. The peak potentials for oxidation and reduction of pyrenylalanine were similar to those referred for pyrene. However, it was found that, when the pyrene ring was conjugated with the dehydroamino acid moiety, the compounds were more difficult to oxidize and easier to reduce than pyrene. The fluorescence properties of four of the pyrenylamino acids synthesized were evaluated in cyclohexane and alcohols. The of methyl ester of N,N-bis(tert-butoxycarbonyl)-beta-[(pyren-1-yl)methylamino] alanine presented high fluorescence quantum yield in cyclohexane and ethanol (0.45 and 0.35, respectively).
TypeArticle
URIhttp://hdl.handle.net/1822/8364
DOI10.1002/ejoc.200800640
ISSN1099-0690
1434-193X
Publisher versionhttp://www3.interscience.wiley.com/journal/27380/home
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CDF - FAMO - Artigos/Papers (with refereeing)

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