Achieving control over the diastereoselectivity of 1,3-dipolar cycloaddition reactions to obtain maximum number of diastereomers under simple operation is an enduring challenge. In this work, the diastereodivergent 1,3-dipolar cycloaddition of α-fluoro-α,β-unsaturated arylketones and azomethineylides was studied experimentally and theoretically. The reaction produced pyrrolidines (endo- and exo-adducts
Diastereodivergent Synthesis of Chiral 4-Fluoropyrrolidines (<i>exo</i> and <i>exo</i>′) Based on the Cu(II)-Catalyzed Asymmetric 1,3-Dipolar Cycloaddition
1,3-Dipolarcycloaddition of azomethine ylides and electron deficient alkenes is widely studied for rapid installation of pyrrolidine frameworks. Despite significant advances, the major limitations of this process are creating chiral pyrrolidines bearing a quaternary stereogenic center and controlling the diastereoselectivity. Herein, we present an exo-selective asymmetric1,3-dipolar cycloaddition
PhIO as a Powerful Cyclizing Reagent: Regiospecific [3+2]-Tandem Oxidative Cyclization of Imine toward Cofacially Self-Aggregated Low Molecular Mass Organic Materials
作者:Palash Pandit、Nirbhik Chatterjee、Samiran Halder、Sandip K. Hota、Amarendra Patra、Dilip K. Maiti
DOI:10.1021/jo8028136
日期:2009.3.20
The powerful cyclization and tandem oxidation property of environmentallybenign PhIO is developed for the first time, which leads to regiospecific [3+2]-tandem oxidative cyclization of imine at room temperature in rapid access to a new class of compounds, 1,2-functionalized 4,5-diarylimidazoles, in excellent yield with synthetic efficiency. Size, shape, and activity of the involved nanoreactors for