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。
Potassium Hydroxide-Catalyzed Chemoselective Reduction of Cyclic Imides with Hydrosilanes: Synthesis of ω-Hydroxylactams and Lactams
hydroxide‐catalyzed hydrosilylation exhibits excellent activity and chemoselectivity for the reduction of cyclic imides under mild reaction conditions. The chemoselectivity of the reduction system may be readily tuned by changing the identity and stoichiometry of the hydrosilanes: a polymethylhydrosiloxane (PMHS)/potassium hydroxide reduction system resulted in the reduction of various cyclic imides to
A variety of cyclic five-membered imides was trifluoromethylated in good to excellent chemical yields using (trifluoromethyl)trimethylsilane CF3SiMe3 under fluoride ion catalysis. The method was successfully applied to the stereoselective synthesis of trifluoromethylated bi- and tricyclic lactams which could serve as precursors for designed thrombin inhibitors.
Improved microwave oven synthesis of amides and imides promoted by imidazole; convenient transport agent preparation
作者:Bruce W. Baldwin、Takuji Hirose、Zhen-He Wang
DOI:10.1039/cc9960002669
日期:——
Microwave dielectric loss heating without solvent or support yields amides and imides from aromatic and sterically hindered acids in the presence of imidazole in good to excellent yields under mild irradiation conditions.