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Search results for: claisen condensation
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... O-Alkylation of the aldehyde 11 followed by Claisen rearrangement established the alkylated quaternary center. ... norbornane 8 as a single diastereomer. Condensation of the derived ketone 9 with acetone ...
... improvement. A second route involved a Claisen condensation approach; using an acid-chloride analogue ... the Weinreb amide above, and a ?-ketoester. The unnecessary allylic ester moiety was ...
... , followed by intramolecular transesterification-enol formation and Claisen condensation of the ketoacetonitrile tautomer with ester ... group. see article for more examples Key Words 3(2H) -furanones ...
... , presumably by way of an equilibrating Claisen rearrangement . Fortunately, when the solid ... way of the corresponding enol triflate. Condensation with dihydrorescorcinol 9 delivered the triene 10 ...
... , 1847. Key Words: ACCELERATED CLAISEN REARRANGEMENTS/CHIRAL ORGANOALUMINUM REAGENT/N-ALLYLKETENE ... 569. Key Words: ENZYMATIC ALDOL CONDENSATION/ALDEHYDE-SAMP HYDRAZONES/ASYMMETRIC-SYNTHESIS/NUCLEOPHILIC ...
... excess of 30 was maintained in the Johnson-Claisen rearrangement to 31. The pathology of ... to the enal 32, followed by condensation with the phosphorane 34, to give ...
... of Chugai Pharmaceutical Co. optimized the Ireland-Claisen rearrangement of 18 to 19 (Org ... constructed the epoxide 7 by the Darzens condensation of 6 with the aldehyde 5 ( ...
... the key quaternary stereocenter generated in a Ireland-Claisen rearrangement . The rearrangement precursor - an ... after Swern oxidation performed a regioselective aldol condensation to give the desired G-ring. For ...
... took them to the precursor of two Claisen rearrangements. The first is perhaps the ... steps further on (including a Henry condensation and a stereoselective methylation), and ...
... followed by the Johnson modification of the Claisen rearrangement gave 10, that was carried ... of 17 led to a diamine that condensed with the aldehyde to give the desired ...