Syntheses in enantiopure form of four diastereoisomeric naphthopyranquinones derived from aphid insect pigments
作者:Rachna Aggarwal、Robin G. F. Giles、Ivan R. Green、Francois J. Oosthuizen、C. Peter Taylor
DOI:10.1039/b414213f
日期:——
The first syntheses are described of the four enantiopure naphthopyranquinones (1R,3R,4S)- and (1R,3R,4R)-3,4-dihydro-4,7,9-trihydroxy-1,3-dimethylnaphtho[2,3-c]pyranquinone (quinone A 1 and quinone A' 2) and their two C-3 epimers, the (1R,3S,4S)- and (1R,3S,4R)-diastereoisomers 5 and 6, using enantiopure lactate as the source of asymmetry. Key factors in these syntheses are the maintenance of stereochemical