Nucleophilic Addition to Silyl-Protected Five-Membered Ring Oxocarbenium Ions Governed by Stereoelectronic Effects
作者:Vi Tuong Tran、K. A. Woerpel
DOI:10.1021/jo400945j
日期:2013.7.5
selectivity in silyl-protected 2-deoxyribose systems. The disiloxane ring unexpectedly enables the diaxial conformer of the cation to be stabilized by an electronegative atom at C-3. This low energy conformer subsequently undergoes stereoelectronically controlled nucleophilic addition to give substituted tetrahydrofurans with high diastereoselectivity.
研究了一系列含有二硅氧烷环的稠合双环缩醛,以评估甲硅烷基保护的 2-脱氧核糖系统中的选择性来源。二硅氧烷环出人意料地使阳离子的双轴构象异构体能够通过 C-3 处的负电原子稳定。这种低能构象异构体随后经历立体电子控制的亲核加成,得到具有高非对映选择性的取代四氢呋喃。