B(C 6 F 5)3催化的环状酰亚胺的氢化硅烷化提供了吡咯烷的有效合成方法。在5mol%B(C 6 F 5)3的存在下,各种芳族,脂族和多环酰亚胺被PhSiH 3平滑还原,从而以高收率生成相应的吡咯烷。通过1 H NMR光谱监测的反应曲线揭示了环酰亚胺的还原过程以及氢化硅烷的不同结构对氢化硅烷化的影响。
3‐disubstituted phthalides in good to high yields at ambienttemperature. In a similar manner, 3‐hydroxyisoindolin‐1‐one and 3‐hydroxyoxindole derivatives could also be easily prepared by direct reductive coupling of phthalimides and N‐substituted isatins with activated alkenes, respectively. Application of this methodology towards the synthesis of 1‐naphthol derivatives on a gram scale is also depicted
realized via tandem reduction and rearrangement. Using TMSOK as the catalyst and (EtO)2MeSiH as the reductant, a series of cyclic imides containing different functional groups were reduced to the corresponding 3-aryl isoquinolines in moderate to good yields. The scenario of the reaction pathway was supposed to involve the reduction of imides to ω-hydroxylactams, which underwent rearrangement in the presence
B(C6F5)3-catalyzed hydrosilylation of cyclicimides afforded an efficient synthetic method of pyrrolidines. In the presence of 5 mol% B(C6F5)3, various aromatic, aliphatic and polycyclic imides were smoothly reduced by PhSiH3 to generate the corresponding pyrrolidines in high yields. The reaction profiles monitored by 1H NMR spectroscopy disclosed the reduction process of cyclicimides and the effect of difference
B(C 6 F 5)3催化的环状酰亚胺的氢化硅烷化提供了吡咯烷的有效合成方法。在5mol%B(C 6 F 5)3的存在下,各种芳族,脂族和多环酰亚胺被PhSiH 3平滑还原,从而以高收率生成相应的吡咯烷。通过1 H NMR光谱监测的反应曲线揭示了环酰亚胺的还原过程以及氢化硅烷的不同结构对氢化硅烷化的影响。
Intramolecular Formal [4 + 2] Cycloadditions: Synthesis of Spiro Isoindolinone Derivatives and Related Molecules
作者:Yarkali Krishna、Fujie Tanaka
DOI:10.1021/acs.orglett.1c00283
日期:2021.3.5
Acid-catalyzed intramolecular reactions of isoindolinone-derived hydroxylactam derivatives bearing enones or enals that afford spiro isoindolinone derivatives and related molecules have been developed. From the hydroxylactam moieties, N-acylenamides were generated in situ and reacted with the enone and the enal moieties via formal [4 + 2] cycloaddition reactions to construct cyclohexanone- and dihydropyran-fused