H. Spreitzer et al., SYNTHESIS AND ODOR OF CHIRAL PARTIAL STRUCTURES OF KHUSIMONE - PART-3- SHORT COMMUNICATION, Helvetica Chimica Acta, 81(1), 1998, pp. 40-45
Khusimone (1). one of the main odor-donating compounds of vetiver oil,
is subject of the following study on structure-odor relationship. The
omittance of the methano bridge of the tricyclic khusimone should lea
d to the bicyclic partial structure(-)-2. Unexpectedly, (-)-2 could no
t be obtained since epimerization favored(-)-16. The stereochemical ke
y step of the synthesis of the hydrazulene nucleus is based on a highl
y diastereoselective conjugate addition to a chiral oxocyclopent-1-ene
-1-carboxylate.