Natural deep eutectic solvents in the hetero-Diels–Alder approach to bis(indolyl)methanes
作者:Carla Grosso、Amadeu Brigas、Jesús M. de los Santos、Francisco Palacios、Américo Lemos、Teresa M. V. D. Pinho e Melo
DOI:10.1007/s00706-019-02421-7
日期:2019.7
For the first time, the use of natural deepeutecticsolvents (NADES) as reaction media to carry out hetero-Diels–Alder reactions is disclosed. This allowed to improve the efficiency and sustainability of the synthetic approach to bis(indolyl)methanes (BIMs) based on bis-hetero-Diels–Alder/conjugate addition reactions of nitroso- and azoalkenes with indoles. The ternary mixture of H2O with choline
On-Water Synthesis of Dipyrromethanes via Bis-Hetero-Diels–Alder Reaction of Azo- and Nitrosoalkenes with Pyrrole
作者:Américo Lemos、Teresa Pinho e Melo、Nelson Pereira、Susana Lopes
DOI:10.1055/s-0033-1340300
日期:——
An unprecedented one-pot approach to 5-substituted dipyrromethanes based on the hetero-Diels-Alder reaction of azo- and nitrosoalkenes is described. The on-water reaction conditions led to the target compounds in higher yields with significantly shorter reaction times and simpler purification procedures than carrying out the reaction in dichloromethane or in the absence of solvent.
Conjugate Addition of Pyrazoles to Halogenated Nitroso- and Azoalkenes: A New Entry to Novel Bis(pyrazol-1-yl)methanes
作者:Américo Lemos、Teresa Pinho e Melo、Carla Grosso
DOI:10.1055/s-0034-1379306
日期:——
A new and versatile synthetic approach towards bis(pyrazolyl)methanes, based on 1,4-addition of pyrazoles to conjugated -halogenated nitroso- and azoalkenes, is described. Tris(pyrazolyl)methanes can also be obtained by this methodology.
Novel approach to bis(indolyl)methanes: De novo synthesis of 1-hydroxyiminomethyl derivatives with anti-cancer properties
作者:Carla Grosso、Ana Lúcia Cardoso、Américo Lemos、João Varela、Maria João Rodrigues、Luísa Custódio、Luísa Barreira、Teresa M.V.D. Pinho e Melo
DOI:10.1016/j.ejmech.2015.01.050
日期:2015.3
A versatile and broad range approach to previously unknown bis(indolyl)methane oximes based on two consecutive hetero Diels–Alder cycloaddition reactions of electrophilic conjugated nitrosoalkenes with indoles is disclosed. The cytotoxic properties and selectivity of some adducts against several human cancer cell lines pointing to a promising role in the development of anti-tumoural drugs, in particular