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Functionalization of dipyrromethanes via hetero-Diels–Alder reaction with azo- ...
Pereira, Nelson A. M.; Lemos, Américo; Serra, Arménio C.; Melo, Teresa M.V.D. Pinho e5,5′-Diethyl- and 5-phenyldipyrromethanes participate in cycloadditions with azo- and nitrosoalkenes giving dipyrromethanes with side chains containing open chain oximes and hydrazones. By controlling reaction stoichiometry it is possible to get mono or 1,9-disubstituted derivatives. The reported methodology gave access to a range of dipyrromethanes with good structural features for various applications. It was...
Data: 2013
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Origem: Estudo Geral - Universidade de Coimbra
Ethyl 3-(2-pyridyl)-2H-azirine-2-carboxylate : synthesis and reactivity with di...
Alves, M. José; Fortes, A. Gil; Lemos, Américo; Martins, Cristina I.Ethyl 3-(2-pyridyl)-2H-azirine-2-carboxylate, the first example of an 3-heteroamatic-2H-azirine, was prepared and its reaction with conjugated 1,3-dienes, under mild conditions and in the absence of Lewis acid catalyst, produced cycloadducts in good yield and high stereoselectivity.
Data: 2005
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Origem: RepositóriUM - Universidade do Minho
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