Total Synthesis of the Coccinellid
Alkaloid (±)-Adalinine Utilizing a Nitrenium Ion Cyclization
作者:Duncan Wardrop、Chad Landrie、José Ortíz
DOI:10.1055/s-2003-40322
日期:——
The total synthesis of (±)-adalinine, a piperidine alkaloid from the European two-spotted ladybird Adalia bipunctata, is reported. Central to this undertaking are (i) the use of an N-alkoxy-N-acylnitrenium ion-induced spirocyclization to rapidly access the 6,6′-disubstituted piperidinone ring of the natural product and (ii) exploitation of the cyclohexa-2,5-dienone system generated in this process as a latent 1,6-ketoaldehyde.
本报告报道了 (±)-adalinine 的全合成,这是一种来自欧洲双斑瓢虫 Adalia bipunctata 的哌啶生物碱。这项工作的核心是:(i) 利用 N-烷氧基-N-酰基腈离子诱导的螺环化反应,快速进入天然产物的 6,6′-二取代哌啶酮环,以及 (ii) 利用在此过程中产生的环己-2,5-二酮体系作为潜伏的 1,6-酮醛。