A Concise, Biomimetic Total Synthesis of (+)-Davanone
作者:Karen C. Morrison、Jonathan P. Litz、Kathryn P. Scherpelz、Paul D. Dossa、David A. Vosburg
DOI:10.1021/ol900697w
日期:2009.5.21
A concise, biomimeticsynthesis of the antifungal and antispasmodic natural product (+)-davanone is described. The key stereoselective reactions are a Sharpless asymmetric epoxidation, a thiazolium-catalyzed esterification, and a palladium-mediated cyclization. All carbons are derived from isoprene units and no protecting groups are used, permitting an atom- and redox-economical synthesis.
Transformation of davanone : Reductive cleavage of tetrahydrofuran and thermal cyclization of 1:3-diene
作者:Laxmi N. Misra、Amitabh Chandra、Raghunath S. Thakur
DOI:10.1016/s0040-4039(00)99486-3
日期:1989.1
Cis- β -davanone () the major but odourless component of davana oil (Artemisia pallens) has been converted into various derivatives to yield the compounds with delicate aroma. The LiAlH4 reduction resulted into the unusual cleavage of the tetrahydrofuran ring and the major reduction product () after thermal dehydration afforded an unusual electrocyclically rearranged cyclobutene ().