Stereoselective Syntheses of (+)-Davanone and (+)-Artemone via Anti-selective Epoxidation and Iodo-cyclization
作者:Yutaka Honda、Aiichiro Ori、Gen-ichi Tsuchihashi
DOI:10.1246/cl.1987.1259
日期:1987.7.5
Chiral sesquiterpenes, (+)-Davanone and (+)-Artemone, were synthesized via anti-selective epoxidation and iodo-cyclization by the use of (S)-ethyl lactate as a chiral source.
A concise and versatile synthesis of both cis and trans diastereomers of the natural products artemone, hydroxydavanone, isodavanone, and nordavanone has been accomplished. The preparation of trans-davanone is also described. Each synthesis is six to eight steps from geranyl acetate, with differentiation between cis and trans products occurring through a diastereoselective cyclization prior to derivatization. Many of these compounds are minor components of davana oil and have now been synthesized for the first time.
A Divergent and Protecting Group-Free Synthesis of Davana Acid, Lilacaldehyde, Linaloolepoxide, Nordavanone, and Artemone by a Bioinspired Approach