A synthesis of (±)-demethoxydaunomycinone
Abstract
2-Acetyl-1,4-dihydroxyanthracene-9,10-dione 1 is converted into (±)-demethoxydaunomycinone by substitution with 3,3-dimethoxy-1-nitrobutan-2-one, aldol cyclisation, reduction and hydrolysis. The chiral inductions at C-10 realised on cyclisation of 5 and 8 are reported and the predominant chirality established.