Reactivity of allenoates towards aziridines: synthesis of functionalized methylenepyrrolidines and pyrroles
作者:Fernanda M. Ribeiro Laia、Ana Lúcia Cardoso、Ana Matos Beja、Manuela Ramos Silva、Teresa M.V.D. Pinho e Melo
DOI:10.1016/j.tet.2010.09.081
日期:2010.11
The reactivity of buta-2,3-dienoates towards aziridines is reported. Typically, allenoates react as the 2π-component in the [3+2] cycloaddition with azomethine ylides generated from aziridines, affording 4-methylenepyrrolidines in a site-, regio- and stereoselective fashion. However, N-cyclohexyl- or N-tert-butyl-2-benzoyl-3-phenylaziridines showed a different reactivity in the reaction with buta-2
Reactivity of allenoates toward aziridines: [3+2] and formal [3+2] cycloadditions
作者:Fernanda M. Ribeiro Laia、Teresa M.V.D. Pinho e Melo
DOI:10.1016/j.tetlet.2009.08.088
日期:2009.11
reported. Allenoates react as 2π-component in the [3+2] cycloaddition with the azomethine ylide generated from cis-1-benzyl-2-benzoyl-3-phenylaziridine affording 4-methylenepyrrolidines in a site-, regio-, and stereoselective fashion. Under conventional thermolysis, cis- and trans-2-benzoyl-1-cyclohexyl-3-phenylaziridines showed a different reactivity. These aziridines participate in formal [3+2] cycloadditions
Synthesis of Pyrroles in Supercritical Carbon Dioxide: Formal [3+2] Cycloaddition of 2-Benzoyl-Aziridines and Allenoates
作者:Teresa Pinho e Melo、Ana Cardoso、Rui Nunes、Luis Arnaut
DOI:10.1055/s-0030-1260209
日期:2011.11
The reactivity of N-benzyl- and N-cyclohexyl-2-benzoyl-3-phenylaziridines toward allenoates in supercritical carbon dioxide (scCO2) is described. The study led to the development of a sustainable and selective approach to pyrrole derivatives and gave a new insight into the mechanism involved in the process. cycloaddition - scCO2 - aziridines - allenes - pyrroles