Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 84, Issue 21, Pages 13824-13831Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.9b02021
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Funding
- Russian Science Foundation [16-13-10470-P]
- Russian Science Foundation [19-13-13044] Funding Source: Russian Science Foundation
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A correlation between the equilibrium ratio of tautomeric products generated by the asymmetric Michael reactions of cyclic carbon acids with beta,gamma-unsaturated alpha-keto esters and the chemical shift of the alpha-proton in starting nucleophilic substrates was revealed which makes equilibration predictable. New tetrahydropyran-fused benzo[a]phenazins were enantioselectively (up to 99% ee) synthesized from beta,gamma-unsaturated alpha-keto esters and benzo[a]phenazin-5-ol, a powerful anti-cancer agent sAJM589. Facile recyclability of catalyst Ia in the catalytic reactions was demonstrated.
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