equimolar mixture of aldehyde and nitroalkane exclusively into β-nitroalcohols via the Henry reaction. Unlike most of the commonly used catalysts, polymersupported DMAP can be recovered by simple filtration and reused several times, thereby reducing the operational cost. High synthetic efficiency, total atom economy, near quantitative yields, mild reaction conditions, operational simplicity, easy recovery
An excellent yield of nitroalcohol was obtained within 15–30 minutes. No dehydrated product was observed. The catalyst used in these studies has the advantage of being a waste material and is hence low-cost, easily prepared, recyclable and environmentally friendly. In addition, the use of a biogenic renewable catalyst, itsatom economy, and roomtemperature and solvent-free reaction conditions and
Preparation of an ABC tricyclic model of the cylindrospermopsin alkaloids via a biomimetically inspired pathway
作者:Daniel. M. Evans、Peter N. Horton、Michael B. Hursthouse、Patrick. J. Murphy
DOI:10.1039/c4ra03031a
日期:——
The protected guanidine18was convertedviaa 4-step sequence (Boc-deprotection, tethered Biginelli condensation, deallylation/decarboxylation and reduction) to give the tricyclic guanidines26and27, models of the tricyclic core of cylindrospermopsin1.
A biomimetic approach to the cylindrospermopsin alkaloids
作者:Daniel M. Evans、Patrick J. Murphy
DOI:10.1039/c0cc05034b
日期:——
The tethered Biginelli condensation between hemiaminal 21 and beta-keto ester 22 is reported, leading to a model tricyclic core of the cylindrospermopsin alkaloids.