Retrosynthetic Analysis of Retigeranic Acid

Subsequently, a study of the synthetic route corresponding to the direct disconnection of ring C, 263 = 271 was reported.81 Although the critical synthetic conversion of 271 to 263 showed only modest stereoselectivity (ca. 3 1), the synthetic sequence is convergent. 

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The multistrategic retrosynthetic analysis of retigeranic acid, which led to the synthesis outlined below, has been described in Section 6.6 of Part One. 

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