Improved synthesis of (R)-7-hydroxycarvone from (S)-α-pinene
2013
Abstract A three-step synthesis of ( R )-7-hydroxycarvone ( 1 ), which is anticipated to be a valuable building block for the versatile preparation of natural products, is described. Optimization of the reaction conditions for photooxygenation and migration of ( S )-α-pinene 2 , tetrapropylammonium perruthenate (TPAP) oxidation of the generated alcohol, and a subsequent ring-opening reaction in the presence of Cu(OTf) 2 led to the synthesis of 1 with good reproducibility. The desired product 1 was thus obtained in 46% yield over three steps.
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