Journal
ORGANIC LETTERS
Volume 20, Issue 3, Pages 832-835Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.7b03972
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Funding
- Deutsche Forschungsgemeinschaft [ME 776/22-1]
- Graduate Academy of TU Dresden - Excellence Initiative of the German Federal and State Governments
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Desymmetrization of a p-quinone monoacetal by organocatalytic sulfa-Michael addition provided rapid access to a C-ring building block for a formal synthesis of (-)-codeine. By means of a diastereoselective 1,2-addition for A/C-ring union, an intramolecular nitrone cycloaddition for construction of the phenanthrene core, and a sulfoxide elimination, an enantiopure key intermediate of the authors' previous synthesis of racemic codeine was available in 12 steps from isovanillin.
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