Synthesis and some transformations of (−)-carveol
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Reduction of the oxo group in (−)-carvone with LiAlH4, NaBH4, and (i-Bu)2AlH was performed. It was found that the reduction with the system CeCl3 · 7 H2O-NaBH4 in methanol at 20°C is the most practical procedure for the synthesis of (−)-carveol. Solvolysis of (−)-carvyl methanesulfonate gave products of SN2 and SN2′ replacement of the methylsulfonyloxy group, the latter slightly prevailing. Overman rearrangement of (−)-carveol resulted in the formation of the corresponding trichloroacetamide derivative, and intramolecular iodoetherification of the title compound afforded 6-iodomethyl-2,6-dimethyl-7-oxabicyclo[3.2.1]oct-2-ene.
KeywordsPetroleum Ether Solvolysis Carvone Carveol Methanesulfonyl Chloride
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