A Highly Stereoselective Knoevenagel Reaction of<i>N</i>-Tosylimines with Active Methylene Compounds in DMSO
作者:Ryoichi Chiba、Takeshi Oriyama
DOI:10.1246/cl.2008.1218
日期:2008.12.5
In the presence of molecular sieves (MS) 4A in dimethyl sulfoxide (DMSO), a highly stereoselective Knoevenagel reaction of various N-tosylimines with activemethylenecompounds proceeded smoothly, producing the corresponding Knoevenagel products in high to excellent yields.
Michael Addition of N-Heteroaromatics to Vinylphosphonates and Synthesis of Phosphoryl Pyrrolizones by Cyclization of Michael Adducts
作者:Canan Unaleroglu、Dilek Tasgin
DOI:10.1055/s-0032-1317894
日期:——
Novel phosphonate compounds were synthesized via Michael addition of N-heteroaromatic compounds to aryl-and alkyl-substituted vinylphosphonates using scandium triflate as the catalyst. Intramolecular cyclization reaction of the Michael adducts obtained gives novel (dimethoxyphosphoryl) pyrrolizin-3-ones in high yields as a single diastereomer.