A highly diastereoselective [5+1] annulation to 2,2,3-trisubstituted tetrahydroquinoxalines <i>via</i> intramolecular Mannich-type trapping of ammonium ylides
作者:Xiao-Yu Guan、Min Tang、Zhang-Qin Liu、WenHao Hu
DOI:10.1039/c9cc04890a
日期:——
A novel tandem intermolecular ammonium ylide formation/intramolecular Mannich-type [5+1] cyclization reaction of aryl diazoacetates and ortho-aminophenyl imine derivatives was developed. The reaction provides an efficient methodology for direct synthesis of diverse trisubstituted tetrahydroquinoxalines bearing a quaternary stereogenic carbon center in moderate to good yields with excellent diastereoselectivity