作者:Thomas N. Snaddon、Philipp Buchgraber、Saskia Schulthoff、Conny Wirtz、Richard Mynott、Alois Fürstner
DOI:10.1002/chem.201001133
日期:2010.10.25
productive total synthesis of both enantiomers of berkelic acid (1) is outlined that takes the structure revision of this bioactive fungal metabolite previously proposed by our group into account. The successful route relies on a fully optimized triple‐deprotection/1,4‐addition/spiroacetalization cascade reaction sequence, which delivers the tetracyclic core 32 of the target as a single isomer in excellent
Scalable Total Synthesis of (−)-Berkelic Acid by Using a Protecting-Group-Free Strategy
作者:Francisco J. Fañanás、Abraham Mendoza、Tamara Arto、Baris Temelli、Félix Rodríguez
DOI:10.1002/anie.201109076
日期:2012.5.14
polycyclic core of (−)‐berkelic acid (1) was constructed in just one step from very simple starting materials. The totalsynthesis of 1 involves a seven‐step linear sequence. Protection/deprotection steps were avoided and all but the last step were performed on a gram scale. This synthesis could solve the supply problem associated with the exhaustion of the natural source.