First Synthesis of the Pyrano-Naphthoquinone Lactone (-)-Arizonin C1
作者:Manuel Mahlau、Rodney A. Fernandes、Reinhard Brückner
DOI:10.1002/ejoc.201100599
日期:2011.6.21
dihydroxylation of β,γ-unsaturated ester 9d as a highly enantioselective (>99 % ee) access to the γ-lactone intermediate 7d. Oxa-Pictet–Spengler cyclization, oxidation, and epimerization as expected led to the conversion of 7d into 2d. The pentasubstituted naphthalene precursor 14 of ester 9d was obtained by Dotz benzannulation.