Synthesis and Atropisomeric Properties of Benzoazepine-Fused Isoindoles
作者:Lillian A. de Ceuninck van Capelle、Steven M. Wales、James M. Macdonald、Megan Kruger、Christopher Richardson、Michael G. Gardiner、Christopher J. T. Hyland
DOI:10.1021/acs.joc.3c00607
日期:2023.7.7
Atropisomeric, bench-stable benzoazepine-fused isoindoles were synthesized via oxidation from isoindoline precursors. Using the isoindoles 5d–f as models, the stereochemistry and conformational folding of the systems were examined. Chiral UHPLC was used to analyze the rate of racemization and calculate the Gibbs free energy of enantiomerization (ΔG‡Enant). X-ray crystallography, 1H NMR spectroscopy
通过异吲哚啉前体的氧化合成了工作台稳定的阻转异构体苯并氮卓稠合异吲哚。使用异吲哚5d – f作为模型,检查了系统的立体化学和构象折叠。使用手性UHPLC分析外消旋化率并计算对映体化的吉布斯自由能(ΔG ‡ Enant )。X 射线晶体学、1 H NMR 光谱和 DFT 计算用于阐明手性的三个轴并阐明影响 Δ G ‡ Enant的结构因素。绕手性轴的串联旋转阻止了非对映异构体的形成,同时限制了 C 的旋转芳基-N磺酰胺键被确定为系统中阻转异构体稳定性的调节剂,主要受空间位阻以及磺酰胺在异吲哚部分上的折叠构象促进的π堆积相互作用的影响。
β-Trimethylsilylethanesulfonyl chloride (SES-Cl): A new reagent for protection of amines
作者:Steven M Weinreb、Donald M Demko、Thomas A Lessen、James P Demers
DOI:10.1016/s0040-4039(00)84458-5
日期:1986.1
The title compound, easily prepared in two steps from vinyltrimethylsilane, is a useful reagent for the protection of primary and secondary amines as their sulfonamides, which are cleaved by fluoride ion.