A Tsuji-Trost variant of the Winstein-Masamune reaction has been investigated for the synthesis of the AC spirocyclic ring system 9 bearing a quaternary carbon found in the fawcettimine type Lycopodium alkaloids magellanine 1 and lycojaponicumin B 2 and cyclopiane diterpenes such as conidiogenone 3. Annulation of the B ring for the synthesis of tricyclic ABC cores was demonstrated utilizing a 5-exo-trig free radical cyclization of a primary carbon radical onto a cyclohexadienone generated with tri-n-butylgermanium hydride (9 → 11).

中文翻译：

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螺内[4.5]癸烷结构合成生物碱和萜烯的分子内对-苯酚烯丙基化自由基环化策略

该温斯腾-正宗反应的辻-特罗斯特变体已被研究用于AC螺环环系的合成9轴承的季碳在fawcettimine类型发现石松生物碱magellanine 1和lycojaponicumin乙2和cyclopiane双萜如conidiogenone 3。B环的环用于合成三环ABC芯证实利用5-外型-trig自由基伯碳基团环化到用三-产生的环己二烯酮Ñ -butylgermanium氢化物（9  →  11）。