Add time:07/22/2019         Source:sciencedirect.com

The coumarin CM-c2, from Cnidium monnieri, 7-methoxy-8-(3-hydroxy-3-methylbut-1-enyl) coumarin, has been synthesized by palladium acetate-catalysed condensation of 7-methoxy-8-iodocoumarin with 2-methylbut-3-en-2-ol. Its stereochemistry follows from its conversion to trans-dehydroosthol. The identity of CM-c2 and Murraol (cas 109741-38-0) has been established. Swietenocoumarin G has been prepared similarly from bergaptol.

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