Synthesis of polycyclic compounds: synthesis of 2-methyl 5 6 keto 1,2,3,4,5,6,7,8 octahydronaphthalene, methyl 3-methoxyoestra-1,3,5 (10) triene carboxylate, oestra 4 ene 3 one 17 carboxyclic acid, 19 nor progesterene, and 19 norpregen-4-ene-20 ol
