Reactivity of Dipyrromethanes towards Azoalkenes: Synthesis of Functionalized Dipyrromethanes, Calix[4]pyrroles, and Bilanes
作者:Susana M. M. Lopes、Américo Lemos、Teresa M. V. D. Pinho e Melo
DOI:10.1002/ejoc.201402944
日期:2014.11
chains at the 1- and 9-positions of dipyrromethanes was explored by using the hetero-Diels–Alder reaction of azoalkenes. New 5,5′-diethyldipyrromethanes and 5-phenyldipyrromethanes that were functionalized with open-chain hydrazone moieties, including derivatives with tetrazolyl groups, were prepared. Furthermore, the synthesis of new calix[4]pyrroles and bilanes was achieved by employing the bis(hetero-Diels–Alder)
Functionalization of dipyrromethanes via hetero-Diels–Alder reaction with azo- and nitrosoalkenes
作者:Nelson A.M. Pereira、Américo Lemos、Arménio C. Serra、Teresa M.V.D. Pinho e Melo
DOI:10.1016/j.tetlet.2013.01.032
日期:2013.3
5,5'-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 demonstrated that reduction of dipyrromethanes containing alpha-oximino ester groups opens the way to new alpha-amino esters. (c) 2013 Elsevier Ltd. All rights reserved.