An efficient two-step procedure for photooxidative dehydrogenation of drimane and 11-homodrimane compounds containing an 8-en-7-one structural unit into α,α′-dienones was elaborated. The method is based on the transformation of ketones into the respective enol acetates followed by photosensitized oxygenation. Methyl 7-oxo-11-homodrima-5,8-dien-12-oate, 5,6-dehydro-7-ketoisodrimenine, 11-acetoxydrima-5,8-dien-7-one and 11,12-diacetoxydrima-5,8-dien-7-one were prepared in high yields starting from methyl 7-oxo-11-homodrim-8-en-12-oate, 7-oxoisodrimenine, 11-hydroxydrim-8-en-7-one and 11,12-diacetoxydrim-8-en-7-one, respectively.
研究人员详细阐述了将含有 8-en-7-one 结构单元的 drimane 和 11-homodrimane 化合物光氧化脱氢为 α,α′-二烯酮的高效两步法。该方法基于将酮转化为相应的烯醇
乙酸酯,然后进行光敏加氧。7-oxo-11-homodrima-5,8-dien-12-oate 甲基、5,6-dehydro-7-ketoisodrimenine、11-acetoxydrima-5,8-dien-7-one 和 11,12-diacetoxydrima-5、分别以 7-oxo-11-homodrim-8-en-12-oate 甲基、7-oxoisodrimenine、11-hydroxydrim-8-en-7-one 和 11,12-diacetoxydrim-8-en-7-one 为起始原料,高产率地制备出了 8-二烯-7-酮。