作者:Ravindra B. Pathak、Benjamin C. Dobson、Nandita Ghosh、Khalid A. Ageel、Madeha R. Alshawish、Rungroj Saruengkhanphasit、Iain Coldham
DOI:10.1039/c4ob02582b
日期:——
synthetic approach to the core structure of the manzamine alkaloids is reported, particularly in relation to incorporating a one-carbon unit in ring B from which the aldehyde in ircinal A or the beta-carboline unit in manzamine A could potentially be generated. The key steps involve a Johnson-Claisen rearrangement, enolate alkylation, dithiane alkylation and a stereoselective intramolecular dipolar cycloaddition
作者:Iain Coldham、Katherine M. Crapnell、Joan-Carles Fernàndez、Jonathan D. Moseley、Rémi Rabot
DOI:10.1021/jo016376s
日期:2002.8.1
described, starting from arecoline. The key steps involve a Claisen rearrangement to set up a 4-substituted-3-methylenepiperidine and a stereoselective azomethine ylide dipolar cycloaddition reaction. Condensation of the aldehyde 6 and sarcosine ethyl ester hydrochloride salt gives an intermediate azomethine ylide, which undergoes an intramolecular cycloaddition reaction to set up two new rings and three