led to the assignment of a novel spiro-skeleton to agarospirol (Ia), a sesquiterpene alcohol isolated from the essential oil of infected agarwood (Aquilariaagallocha Roxb.). The corresponding carbon skeleton (VI) has been named agarospirane. Agarospirol is the second spiro-terpenoid to be isolated from Nature. The most probable stereochemistry of agarospirol appears to be as in XXXIX.
Claisen Rearrangement Strategy in Alkenyl Dihydropyran Leading to Total Synthesis of (+)-α-Vetispirene and (−)-Agarospirol
作者:Atsuo Nakazaki、Susumu Kobayashi
DOI:10.1246/cl.2007.42
日期:2007.1
Total synthesis of (+)-α-vetispirene and (-)-agarospirol based on a Claisen rearrangement has been achieved. This is the first example of a Claisen rearrangement in an enantio-enriched alkenyl bicyclic dihydropyran system with perfect asymmetric transmission.