9 光学活性シクロペンタノンを原料とする数種の生理活性化合物の合成(口頭発表の部)

概要

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Chiral cyclopentane derivatives have widely been employed as important starting materials in the syntheses of naturally occurring compounds. Development of an efficient preparation of a chiral cyclopentane derivative from readly available substances with both (+)- and (-)-forms is therefore desirable. We have established an efficient procedure for the preparation of chiral 2-isopropeny1-5-methyl-4-oxocyclo-pentane-1-carboxylate(1) and (2), whose substituents would be transformed into variety of functional groups, from readily avairable (-)- and (+)-carvone. First, the (-)-isomer(1) was employed in the synthesis of (+)-tecomanine (7), an antipodal form of hypoglycemic monoterpene alkaloid, where the aminylium ion-induced cyclization played an important role. Whereas, N-acetyl-L-acosamine (32), found as a structural component of glycosidic antibiotic, was also derived from the (+)-isomer (2) by utilizing the Beckmann rearrangement and Baeyer-Villiger oxidation as key reactions. Finally, Melillo's lactone(34), a key intermediate for the synthesis of carbapenem antibiotic (+)-thienamycin, was prepared from (-)-isomer(1) by manipulation of its substituents in reasonably high-yield.
天然有機化合物討論会の論文
1987-07-25