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À propos de : Preparation of a 24-Nor-1,4-dien-3-one Triterpene Derivative fromBetulin: A New Route to 24-Nortriterpene Analogues1        

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  • Preparation of a 24-Nor-1,4-dien-3-one Triterpene Derivative fromBetulin: A New Route to 24-Nortriterpene Analogues1
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  • A new route to 24-nortriterpene derivatives with 2-hydroxy-Δ1,4-cyclohexadien-3-one A-rings fromtriterpene precursors has been demonstrated beginning with betulin to prepare derivatives ofbetulinic acid. The key steps in the transformation are a Suárez cleavage of the A-ring with asubsequent SmI2-mediated pinacol-type coupling to reclose the A-ring following removal of the C-24carbon by oxidative cleavage.
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