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Vladimir A. D’yakonov Regina A. Tuktarova Ilgiz I. Islamov Leonard M. Khalilov Usein M. Dzhemilev 《Steroids》2013,78(12-13):1298-1303
The catalytic cycloalumination of 2′-methylidene-2′,3′-ethano-(5α)-cholestane with Et3Al catalyzed by Cp2ZrCl2 was performed for the first time to give spiro[2′,3′-ethano-(5α)-cholestane-2′,3″-aluminacyclopentane] in a ~75% yield and with high stereoselectivity (>98%). The obtained cyclic organoaluminum compound was transformed in situ into heterocyclic spiran derivatives of 2′,3′-ethano-(5α)-cholestane. 相似文献
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