A novel stereocontrolled approach to eudesmanolides: total synthesis of (+/-)-gallicadiol and (+/-)-isogallicadiol |
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Authors: | Li Wei-Dong Z Gao Zhang-Hua |
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Institution: | State Key Laboratory of Applied Organic Chemistry, Lanzhou University, China. liwd@lzu.edu.cn |
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Abstract: | reaction: see text] A novel approach for the stereocontrolled synthesis of eudesmanolides was developed based on a quasi-biomimetic strategy starting from a functionalized oxabicyclic template, as shown above, by which the first total syntheses of gallicadiol (6) and isogallicadiol (7) were achieved. The key elements of the synthesis include: (1) a facile and stereospecific synthesis of a functionalized epoxy aldehyde intermediate; (2) a mild Lewis acid-mediated stereoselective ene cyclization; and (3) a stereocontrolled gamma-lactonization. |
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