Total synthesis of the dolabellane marine diterpenoids, claenone, palominol and dolabellatrienone

The synthesis of marine dolabellane diterpenoids claenone, palominol and dolabellatrienone was conducted from d-mannitol. In each case, formation of the bicyclo[2.2.1]heptane derivative by sequential Michael reaction, preparation of the tetrasubstituted cyclopentane derivative by retro-aldol reaction and cyclization of sulfone were involved as key steps.