Unusually Stable Silyl Ketones with Bowl-shaped Tris(2,6-diphenylbenzyl)-silyl Group for Various Nucleophilic Attacks and α-Deprotonation
作者:Seiji Shirakawa、Naoki Komatsu、Atsuko Iwasaki、Keiji Maruoka
DOI:10.1055/s-2002-22722
日期:——
A newly designed, bowl-shaped tris(2,6-diphenylbenzyl)silyl (TDS) group can be successfully utilized as a highly effective shield of ketone carbonyls for various nucleophilic attacks and α-deprotonation. The high shielding effect of the bowl-shaped TDS moiety toward carbonyl and even α-protons is verified by the 1H NMR study of TDS ketone 1a in CDCl3, and by its X-ray analysis. The TDS ketone 1b can be cleaved with Bu4NF/BF3·OEt2.
一种新设计的碗形三(2,6-二苯基苄基)硅烷基(TDS)基团可成功用作酮羰基的高效屏蔽层,用于各种亲核攻击和δ-质子化反应。TDS 酮 1a 在 CDCl3 中的 1H NMR 研究及其 X 射线分析证实了碗状 TDS 分子对羰基甚至δ-质子的高度屏蔽作用。TDS 酮 1b 可以用 Bu4NF/BF3-OEt2 裂解。