7-e ndo Radical Cyclizations Catalyzed by Titanocene (III). Straightforward Synthesis of Terpenoids with Seven-Membered Carbocycles

J Justicia, JL Oller-López, AG Campana…

Index: Harayama, Takashi; Shinkai, Yutaka; Hashimoto, Yukiya; Fukushi, Hideto; Inubushi, Yasuo Tetrahedron Letters, 1983 , vol. 24, # 47 p. 5241 - 5244

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Citation Number: 112

Abstract

... Volume: Page: ... 24 In our case, however, the results of Table 1 suggest that in a 6-heptenyl radical such as 22, with a 1,1,5,5-tetrasubstitution pattern, the value of the K exo /K endo ratio is lower than 1 and consequently the 7-endo cyclization product ...