Synthetic Anthracyclinones, XXXI. Total Synthesis of Racemic εe-Rhodomycinonesvia Keto-Ester Cyclization
作者:Karsten Krohn、Wahyudi Priyono
DOI:10.1002/jlac.198619860902
日期:1986.9.12
The ketoesters 15 – 17b were prepared by regioselective alkylation of the anthraquinone acetals 12 – 14 followed by cleavage of the acetals and methyl ethers and esterification. The tetracyclic trans-β-hydroxy esters 25 – 27b were formed predominantly upon treatment of 15 – 17b with Triton B in pyridine, whereas lithium amides in THF gave only the cis-hydroxy esters 28 and 29a. Stereoselective hydroxylation