123. Total synthesis of (±)chokol-A via an intramolecular type-I-magnesium ene reaction
     Oppolzer, W.; Cunningham, A. F.
     Tetrahedron Lett. 1986, 27, 5467-5470

The sesquiterpene (±)chokol-A (1) was synthesized in a diastereoselective manner starting from 1-hexen-5-one-trisylhydrazone (5). The key step 7→8 involves the regio- and stereo-selective magnesium-ene reaction 4→3.

DOI : 10.1016/S0040-4039(00)85239-9