have a role to play in providing sustainable routes to many of the fragrant components identified in agarwood and its smoke when burnt as incense. In this work, we report efforts towards a total synthesis of the guaiane sesquiterpene α-bulnesene, which is found, along with its more fragrant oxidised derivatives, in agarwood. Following the ring-expansion of (R)-carvone using reported procedures, α-butenylation
Stereoselective synthesis of α-bulnesene, 4-epi-α-bulnesene, and 5-epi-α-bulnesene
作者:Edward Piers、Kin Fai Cheng
DOI:10.1139/v70-372
日期:1970.7.15
Lithium-ammonia reduction of the hydroguaiazulene derivative 6, followed by oxidation of the resulting diol 13, gave, in a highly stereoselective manner, the keto alcohol 14. The latter was converted into 5-epi-a-bulnesene (2). In a similar sequence of reactions, 4-epi-a-bulnesene (3) was obtained from compound 9. Photochemical rearrangement of the previously obtained dienone 25 gave the hydroguaiazulene