作者:Keith P. Minor、Larry E. Overman
DOI:10.1016/s0040-4020(97)90401-4
日期:1997.6
Lewis acid-promoted cyclizations of methylenecyclohexane siloxy acetals 14, 15, and 21 afford spiro[4.5]decanones 22, 25, and 29 in good yield. In all cases, exclusive pinacol rearrangement of C-1 of the original three-carbon acetal side chain is observed suggesting that pinacol rearrangement of the intermediate 9-decalyl cation occurs more rapidly than conformational equilibration. This selectivity
路易斯酸促进的亚甲基环己烷甲硅烷氧基缩醛的环化14,15,和21,得到螺[4.5] decanones 22,25,和29以良好的收率。在所有情况下,观察到原始三碳乙缩醛侧链C-1的频哪醇重排,表明中间9-癸烷基阳离子的频哪醇重排比构象平衡发生得更快。这种选择性应允许Prins-频哪醇螺环以可预测的方式用于构建立体化学复杂的螺环。