| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 98 === There are two topics in this thesis:
(1) (-)-4-epi-(-)-Pachastrissamine (8) was synthesized using (3R,4R)-hexa-1,5-diene-3,4-diol (48) as the starting material. The synthesis of pachastrissamines applied some key transformations including Sharpless epoxidation of the protected diene-diol, cross metathesis (CM) with 1-tetradecene, hydrogenation, cyclization andinstallation of the amino group. (-)-Pachastrissamin((-)-5) could be prepared after the inversion of the stereocenter at C4.
(2) (-)-Lentiginosine ((-)-66) was also synthesized from (3R,4R)-hexa-1,5-diene-3,4-diol. My contribution to this work was to reduce the ketone functional group of
(1R, 2R, 8aR)-2-(tert-butyldimethylsilyloxy)-1-(methoxymethoxy)hexa
hydroindolizin-7-one (77). After screening several reducingmethods, I found that the sequence of the 1,3-dithiolane formationand Rany-Ni reduction was the most efficient.
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