products and the compounds are also useful chiral buildingblocks for further synthetic endeavours. Highly enantioselective desymmetrisation of Fittig’s lactones with alcohols is promoted by bifunctional cinchona squaramides. The reactions were carried out with monodeuterated methanol to detect possible hidden racemisation of the stereogenic centre. Current evidence suggests that racemisation was not a
Fittig bislactones in cyclopentenone synthesis: short synthesis of methylenomycin B
作者:George M. Strunz、G. Sankar Lal
DOI:10.1139/v82-363
日期:1982.10.15
di-γ-lactone, with methyllithium, followed by alkali, afforded 5-carboxymethyl-2,3-dimethylcyclopent-2-en-1-one. This compound on decarboxylation with lead tetraacetate afforded the antibiotic methylenomycinB.