天然有機化合物討論会講演要旨集
Online ISSN : 2433-1856
セッションID: 16
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16 Gibbane骨格のchiral合成
高野 誠一笠原 千義小笠原 国郎
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会議録・要旨集 フリー

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Results of a chiral approach to the gibbane frameworks are presented. Cyclization of the meso triketone(10), obtained through Michael reaction of 2-propargyl-1,3-indandione(14) with methyl vinyl ketone, using L-proline as chiral catalyst gave the chiral enone(8) via the chiral ketol(17). The enone(8) afforded the following gibbane frameworks, 24 by the ene reaction, and 20, 21 and 22 by acid catalyzed aldol type condensation via the acetyl intermediate (19). Similarly, the chiral gibbane frameworks, and 26, 27, and 29, were obtained from the allyl analogue(11) of 10. The propargyl enone(8) was transformed into the gibberic acid framework via the monoketal(36) and the ketenedithioacetal(38) intermediates.

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© 1979 天然有機化合物討論会電子化委員会
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