The first synthesis of (-)-isishippuric acid A was accomplished in two steps from a bicyclic synthetic intermediate for isishippuric acid B, which confirmed the structure of isishippuric acid A, including its absolute stereochemistry.
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Synthesis of (-)-isishippuric acid A, a 4,5-secoquadranoid from a gorgonian coral.
Biosci Biotechnol Biochem
June 2008
Laboratory of Applied Bioorganic Chemistry, Graduate School of Agricultural Science, Tohoku University, Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai 981-8555, Japan.
The first synthesis of (-)-isishippuric acid A was accomplished in two steps from a bicyclic synthetic intermediate for isishippuric acid B, which confirmed the structure of isishippuric acid A, including its absolute stereochemistry.
View Article and Find Full Text PDFEnantioselective total synthesis of isishippuric acid B via intramolecular Michael reaction.
Org Lett
June 2007
Laboratory of Applied Bioorganic Chemistry, Graduate School of Agricultural Science, Tohoku University, Aoba-ku, Sendai 981-8555, Japan.
The first enantioselective total synthesis of isishippuric acid B bearing a novel 4,5-seco-6-norquadrane skeleton was accomplished from (R)-citronellal with use of a Diels-Alder cycloaddition and an intramolecular Michael addition as the ring-forming steps. Comparison of the optical rotation of the synthetic material with that of the natural product confirmed the absolute configuration of isishippuric acid B to be 1R, 2R, 8R, and 11R.
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