Synthetic Studies on the Ingenane Diterpenes. Direct Conversion of the out,out-Bicyclo(4.4.1)undecane System into a Highly Strained in,out Stereoisomer.-The title out,out-system (III) is isomerized into another one displaying the more strained in,out-bridging relationship (VIII). The latter system is alkylated without loss of the in,out intrabridgehead stereochemical relationship. -(RIGBY, J. H.; DE SAINTE CLAIRE, V.; CUISIAT, S. V.; HEEG, M. J.; J. Org. Chem. 61 (1996) 23, 7992-7993; Dep. Chem., Wayne State Univ., Detroit, MI 48202, USA; EN)
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