The ketone 1a, which we have prepared from geranylacetone in 38% yield by a four step sequence, has been converted to β-copaene and β-ylangene by a three step sequence. Oxidation of β-ylangene with SeO2 gives lemnalol in 76% yield.
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Simple syntheses of (±) -β-copaene, (±) -β-ylangene and lemnalol; Simple Syntheses of (+/-)-beta-Copaene, (+/-)-beta-Ylangene, and Lemnalol