New tricyclic and tetracyclic derivatives have been obtained from dicyclopentadiene as scaffolds for the preparation of diterpene analogues. Key functionalities with well defined spatial dispositions were placed on three different skeletons. The inaccessibility of external (and also internal) reagents to the concave face of these compounds rendered them resistant to several transformations. (c) 2007 Elsevier Ltd. All rights reserved.
New tricyclic and tetracyclic derivatives have been obtained from dicyclopentadiene as scaffolds for the preparation of diterpene analogues. Key functionalities with well defined spatial dispositions were placed on three different skeletons. The inaccessibility of external (and also internal) reagents to the concave face of these compounds rendered them resistant to several transformations. (c) 2007 Elsevier Ltd. All rights reserved.
3,4-Epoxy-5-hydroxycyclopentene via Titanium(IV)-catalyzed photooxygenation and its pyrolysis to 2,4-pentadienoic acid.