Total Synthesis of (+)-Dactylol via a Novel [3 + 5] Annulation Approach
作者:Gary A. Molander、Paul R. Eastwood
DOI:10.1021/jo00119a038
日期:1995.7
(+)-Dactylol (1) has been synthesized from the known (R)-3-methyl-2-methylenecyclopentanone (20) in six steps. The key step in the synthesis involves a regioselective and stereoselective [3 + 5] annulation to afford a tricyclic ether, which upon suitable functional group manipulation was opened to provide the natural product.
Africanol, which had been previously derived from humulene, was converted to dactylol through a formal 1,2-shift of a methyl group, which involved a cyclopropane sliding reaction and subsequent cyclopropane ring opening.
Intramolecular 4 + 3 Cycloadditions. Aspects of Stereocontrol in the Synthesis of Cyclooctanoids. A Synthesis of (+)-Dactylol
作者:Michael Harmata、Paitoon Rashatasakhon
DOI:10.1021/ol006390b
日期:2000.9.1
The judicious placement of stereocenters on precursors for 4 + 3 cycloaddition reactions can lead to high levels of stereocontrol in the 4 + 3 cycloaddition process of cyclopentenyl cations and tethered butadienes. This concept was successfully tested in the context of a synthesis of (+)-dactylol.
Intramolecular [4 + 3] cycloadditions – Stereochemical issues in the cycloaddition reactions of cyclopentenyl cations – A synthesis of (+)-dactylol
作者:Michael Harmata、Paitoon Rashatasakhon、Charles L Barnes
DOI:10.1139/v06-122
日期:2006.10.1
Five cyclopentanones were prepared for the purpose of examining the effects of stereogenic centers on the course of the intramolecular [4 + 3] cycloaddition reactions of cyclopentenyl cations. One substrate reacted with very high levels of diastereoselectivity and was converted to (+)-dactylol. The cyclopentenone without stereogenic centers on the tether or the five-membered ring gave two cycloadducts
Marine natural products: dactylol, a new sesquiterpene alcohol from a sea hare
作者:Francis J. Schmitz、Keitz H. Hollenbrek、David J. Vanderah
DOI:10.1016/0040-4020(78)88409-9
日期:1978.1
A new sesquiterpene alcohol, dactylol, having an uncommon bicyclo [6.3.0] undecane skeleton has been isolated from the sea hare Aplysiadactylomela. Chemical degradation and NMR studies using a shift reagent established the structure and relative stereochemistry. The absolute configuration was derived from ORD/CD data of a substituted cyclopentanone degradation product.