An “Aprotic” Tamao Oxidation/<i>Syn</i>-Selective Tautomerization Reaction for the Efficient Synthesis of the C(1)–C(9) Fragment of Fludelone
作者:Tyler J. Harrison、Philippe M. A. Rabbat、James L. Leighton
DOI:10.1021/ol302221s
日期:2012.9.21
An efficient synthesis of the C(1)–C(9) fragment of fludelone has been developed. The key step is a tandem silylformylation–crotylsilylation/Tamao oxidation sequence that establishes the C(5) ketone, the C(6), C(7), and C(8) stereocenters, and the C(9) alkene in a single operation from a readily accessed starting material. The stereochemical outcome at C(6) depends critically on the development of
已开发出氟地酮 C(1)–C(9) 片段的有效合成。关键步骤是串联甲硅烷基化-巴豆基甲硅烷基化/Tamao 氧化序列,该序列在单个化合物中建立 C(5) 酮、C(6)、C(7) 和 C(8) 立体中心以及 C(9) 烯烃从易于获取的起始材料操作。C(6) 的立体化学结果关键取决于“非质子”Tamao 氧化的发展,这会导致使用“标准”Tamao 氧化条件观察到的内在非对映选择性发生逆转。